Interlocking control method and system for high fill backfill rolling process

Abstract

The application discloses a high fill backfill rolling process interlocking control method and system, relates to the technical field of industrial real-time control, and provides the following scheme, which comprises the following steps: obtaining a representative contact elevation of static pressure passing before vibration rolling of a work unit, issuing an identification excitation instruction for limiting static pressure conditions and the number of passes to a vehicle-mounted controller of a road roller, and forming a response sequence according to the representative contact elevations of each pass; when the response sequence meets an extrapolation condition, determining a zero-pass elevation and a rebound pressure ratio, otherwise, setting the zero-pass elevation and the rebound pressure ratio to a to-be-rechecked state. A same-layer rebound boundary is formed according to the rebound pressure ratios of other work units of the same layer, and a prohibited state or a released state is determined in combination with a compaction degree detection result, a permission control word is generated to control backfill, vibration rolling and curing work of an upper layer, and a work unit that still exceeds the same-layer rebound boundary after curing and recompaction is set to a disposal state and a disposal permission is issued. The application can improve the accuracy of abnormal rebound identification and process management of high fill.

Description

Technical Field

[0001] This invention relates to the field of industrial real-time control technology, and more specifically, this application relates to an interlock control method and system for the backfilling and compaction process of high fill. Background Technology

[0002] In high embankment projects, filling and compaction are carried out layer by layer. The moisture content of the fill material is a key factor determining the compaction effect. After rainfall, fill material with high moisture content will experience surface rise after compaction, and areas with significant rise are referred to in engineering as "rubber soil." These areas often pass on-site compaction tests. However, once covered and loaded by the upper fill material, weak interlayers are formed inside, leading to uneven settlement later. Rework requires the removal of all upper layers. Therefore, it is essential to identify these areas before constructing the upper fill layer.

[0003] To monitor the compaction effect during construction, existing technologies often involve installing high-precision positioning devices on road rollers to continuously collect the elevation of the working surface during compaction operations and evaluate the compaction status of each part. Such devices do not require additional personnel or equipment and can continuously cover the entire working surface along the compaction trajectory, thus gaining widespread application.

[0004] However, the elevation reported using this method always corresponds to the moment the roller is on the soil surface, while the rise that needs to be determined occurs precisely after the roller leaves. If the roller wants to read the rise at a certain point, it must return to that location, causing the roller to fall and the risen soil to be compacted again. Therefore, the height read is not the height after the rise, but rather the residual value after the rise has been offset by the current compaction. This residual value varies depending on the tonnage, speed, and the soil's condition, making readings from different locations incomparable. Thus, areas with significant rise show no difference in readings from normal areas, and are allowed to be covered if all test values ​​are satisfactory. Therefore, when the vehicle collecting elevation data is also the machinery applying load to the soil, the rise after unloading cannot be read, which is precisely the problem that makes it difficult to determine the rise of rubber-coated soil before covering. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this technical solution provides an interlocking control method and system for the high fill backfill compaction process, which solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] Firstly, this application provides an interlocking control method for the compaction process of high fill backfill, including:

[0008] Obtain the representative contact elevation of the static pressure passing through the work unit before the road roller vibrates and compacts on the work unit, wherein the work unit is one of multiple work units divided into the compaction area of ​​the same backfill layer;

[0009] Under the same static pressure condition after vibratory compaction, an identification excitation command is sent to the on-board controller of the road roller, and the N representative contact elevations returned are arranged into a response sequence according to the number of passes. The same static pressure condition refers to the condition used before the static compaction before vibratory compaction. The identification excitation command includes N static compaction passes, where N is a positive integer and not less than 3.

[0010] Determine whether the response sequence meets the preset extrapolation conditions. If so, extrapolate it to obtain the zero-pass elevation. Calculate the increase in zero-pass elevation relative to the first pass and the decrease in representative contact elevation passed by static pressure before vibratory compaction relative to the first pass. Calculate the ratio of the increase to the decrease as the rebound load ratio. Otherwise, set the work unit to a pending review state. Wherein, the first pass is the representative contact elevation passed by the first static pressure after vibratory compaction.

[0011] The rebound boundary of the same layer is determined based on the rebound occupancy ratio of other work units within the same backfill layer.

[0012] Determine whether the rebound compaction ratio of the working unit is greater than the rebound boundary of the same layer. If so, set the working unit to the state to be reviewed. Otherwise, obtain the compaction test result of the working unit. If the result is qualified, set the working unit to the state of release.

[0013] Generate permission control words corresponding to the release state, pending review state, and prohibited state of the work unit and send them to the on-board controller of the road roller and the controller of the backfilling machinery;

[0014] After obtaining the springback duty cycle of the prohibited work unit and processing it with the permission control word, determine whether it is still greater than the springback boundary of the same layer. If so, set the work unit to the disposal state and issue the permission control word corresponding to the disposal state.

[0015] Secondly, this application provides an interlock control system for the high fill backfilling and compaction process, used to implement the above-mentioned interlock control method for the high fill backfilling and compaction process, including a processor and a memory. The memory stores a computer program, and when the computer program is executed by the processor, the processor executes the above-mentioned interlock control method for the high fill backfilling and compaction process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This application controls the road roller to pass through the same area multiple times under the same static pressure conditions, and calculates the surface elevation before the first inspection based on the changing trend of the contact elevation of each pass. This can reduce the secondary compression effect of the road roller passing through again on the already risen soil, avoid mistaking the elevation after compression as the elevation after the soil has been naturally unloaded, and improve the accuracy of identifying abnormal rise and local soft state of soil with high water content.

[0018] This application establishes a proportional relationship between the calculated recovery amount and the compression amount before and after compaction, and forms a comparison boundary based on the results of areas with similar working conditions and qualified tests within the same backfill layer. This allows the judgment criteria to be adjusted according to changes in filler properties, backfill layer position, construction conditions, and site conditions, reducing misjudgments caused by differences in layer thickness, materials, and construction conditions when using fixed thresholds, and improving the comparability and site adaptability of test results between different construction areas.

[0019] This application determines different construction states based on rebound identification results and compaction test results, and issues corresponding permission control information to road rollers, backfilling machinery and treatment equipment. This prevents abnormal areas from entering the upper backfilling process before verification, drying, recompaction or further treatment is completed. In this way, the quality test results are directly converted into execution constraints for construction equipment, avoiding the premature covering of weak areas and reducing the risk of forming hidden weak interlayers, uneven settlement after construction and large-scale rework. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Wherein:

[0021] Figure 1 This is a flowchart of the interlock control method for the backfilling and compaction process of high fill proposed in this invention;

[0022] Figure 2 This is a schematic diagram of the backfill layer compaction area, work unit division, and roller travel route proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the interlock control system for the backfilling and compaction process of high fill volume proposed in this invention. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0025] In traditional high-fill backfill compaction quality control, the elevation reported by the positioning device on the roller always corresponds to the moment when the roller is pressing on the soil surface, while the surface rise of the rubber soil occurs after the roller leaves. The roller must pass through again to read this rise, and when it passes through again, the roller presses the risen soil down again. Therefore, the elevation read is not the free surface elevation after the rise.

[0026] For example, during the compaction of a high embankment backfill layer after rain, the actual free rise of soil after vibratory compaction in a certain area was 16mm. When the roller returned to the area for static compaction, this static compaction pressed the risen soil down again by about 16mm. The elevation reported by the positioning device was basically the same as the elevation during the first static compaction after vibratory compaction, and the rise was recorded as zero. Based on this, the area would be considered a normally compacted area and the upper backfill could be allowed to proceed.

[0027] If the above problems are not addressed, the rubber soil area will form a weak internal interlayer after the upper backfill covers it. Under the subsequent filling load, the excess pore water pressure in this interlayer will persist, resulting in uneven settlement after construction. For substations and other site projects that are sensitive to foundation settlement differences, this will lead to equipment foundation tilting or pipeline breakage, requiring the complete removal of all upper layers during rework.

[0028] Faced with the aforementioned problems, this application first analyzes the root cause of the inability of existing continuous compaction control technology to read the unloading recovery amount, finding that it lies in the fact that the measurement action and the loading action are completed by the same machine, and the measurement behavior itself changes the measured object. To address this contradiction, two improvement directions are attempted: one is to add a non-contact measurement device to directly measure the free surface elevation after the roller leaves; the other is to acknowledge that measurement inevitably causes compression, and instead utilize the attenuation law of compression formed by multiple measurement passes to reverse-calculate the surface elevation when it was not affected by the measurement pass.

[0029] Comparison revealed that while the former method can directly measure the rise, the non-contact measuring device cannot continuously cover the entire work surface along the compaction trajectory, and requires additional equipment and personnel, making it difficult to implement under conditions of rushing to complete work after rain. The latter method, using only the existing positioning device and onboard controller of the roller, can continuously cover the entire compaction area, and the attenuation of compression with each pass of static compaction has a definite mathematical form, making reverse extrapolation feasible. Based on this, this application chooses to have the control system actively issue identification excitation commands that limit the working conditions and number of passes, and the roller itself forms a response sequence through multiple consecutive static compactions. Based on its attenuation relationship, the response sequence is extrapolated to zero passes, and the surface elevation of the free rise is restored by measuring the compression stripping caused by the pass.

[0030] In this regard, such as Figure 1 As shown, this application proposes an interlocking control method for the compaction process of high fill backfill, including:

[0031] To obtain the representative contact elevation of the roller before vibratory compaction on a work unit, the following steps are taken: A work unit is one of multiple work units divided within the compaction area of ​​the same backfill layer. A work unit refers to the smallest control area within the same backfill layer, defined by the spatial overlap of the roller footprints. This can be achieved using the filling layer and zoning module of a construction control system, establishing control objects by assigning work unit and backfill layer identifiers to each area. The representative contact elevation refers to the representative elevation value on the roller contact surface within the work unit during a single pass. This can be achieved by using the median value of the roller contact elevation samples within the overlapping area, suppressing the influence of individual abnormal sampling points on the reading. The representative contact elevation of the roller before vibratory compaction serves as the benchmark elevation for subsequent calculations of the drop.

[0032] Under the same static compaction condition after vibratory compaction, an identification excitation command is sent to the onboard controller of the roller, and the returned N representative contact elevations are arranged into a response sequence according to the number of passes. The same static compaction condition refers to the condition used during static compaction before vibratory compaction. The identification excitation command includes N static compaction passes, where N is a positive integer and not less than 3. The identification excitation command is an operation command actively generated by the control system, requiring the roller to continuously pass through a specified work unit a specified number of times under a specified condition. Specifically, this can be achieved by sending a control message to the onboard controller containing the work unit identifier, backfill layer identifier, static compaction condition, and pass number segment. Actively creating measurement conditions solves the problem that natural operation usually only returns one pass and cannot form an attenuation sequence. The same static compaction condition refers to compaction with vibration turned off and the roller's own weight applied, with the roller identifier, roller loading configuration, travel direction, and travel speed range remaining consistent for each pass. Specifically, this can be achieved by the onboard controller transmitting the actual operating status and verifying each item. By eliminating differences in operating conditions, it ensures that the readings for each pass only reflect the influence of the number of passes. The identification was carried out using static compaction instead of vibratory compaction because static compaction only applies the weight of the roller, has little disturbance to the already risen soil, and is stable and controllable. In contrast, the impact force of vibratory compaction will recompact the risen soil, and its inhibition amount is highly random, making it impossible to form an extrapolable attenuation relationship.

[0033] The system determines whether the response sequence meets the preset extrapolation conditions. If so, it extrapolates to obtain the zero-pass elevation. It calculates the increase in elevation relative to the first pass and the decrease in elevation relative to the first pass from the representative contact elevation reached by static pressure before vibratory compaction. The ratio of the increase to the decrease is used as the rebound load ratio. Otherwise, the work unit is placed in a state awaiting verification. The first pass refers to the representative contact elevation reached by the first static pressure after vibratory compaction. The extrapolation conditions refer to the mathematical and physical premises that the response sequence can be extrapolated forward according to the decay relationship. Specifically, this can be achieved using three criteria: successive decrease, successive decrease in the absolute value of the elevation difference between adjacent passes, and all values ​​being greater than the measurement uncertainty. Distorted extrapolation results are avoided by excluding sequences with incorrect direction, invalid trends, and sequences submerged in noise. The measurement uncertainty is a quantitative characterization of the potential fluctuation range of the repeatedly acquired representative contact elevation difference under the condition that no identifiable real deformation has occurred on the measured surface. Zero-pass elevation refers to the surface elevation obtained by extrapolating to zero passes according to the attenuation relationship, which is not affected by the static pressure of the current identification excitation. It is an estimated value obtained by back-calculation from the response sequence. The rebound load ratio is the ratio of the rebound amount to the drop amount. Specifically, it can be achieved by dividing the two. By normalizing with the drop amount, the differences in layer thickness and filler are eliminated, so that the criteria for different work units can be compared horizontally.

[0034] The rebound boundary of the same layer is determined based on the rebound compaction ratio of other work units within the same backfill layer. The rebound boundary of the same layer refers to the criterion line distinguishing between normal and abnormal rebound within the same backfill layer. Specifically, it can be achieved using the empirical upper quantile value of the rebound compaction ratio of other work units within the same layer that have obtained their rebound compaction ratios and passed the compaction test. By generating the criterion from samples of the same layer, time, and process, systematic misjudgments caused by external fixed thresholds when the filler or layer position changes are avoided. For example, in one implementation, the quantile probability used to calculate the empirical upper quantile value is 0.95, that is, the empirical 95th percentile value of the rebound compaction ratio is used to determine the rebound boundary of the same layer.

[0035] Determine whether the rebound compaction ratio of the work unit is greater than the rebound boundary of the same layer. If so, set the work unit to the pending verification state. Otherwise, obtain the compaction test result of the work unit. If the result is qualified, set the work unit to the release state. The release state means that the rebound and compaction states of the work unit meet the requirements and allow the upper layer backfilling. The prohibited state means that the rebound compaction ratio of the work unit exceeds the criterion boundary of the same layer and is suspected to be rubber soil, which needs to be dried.

[0036] The system generates and issues permission control words corresponding to the release, pending review, and prohibited states of the work unit to the onboard controller of the road roller and the controller of the backfilling machinery. In the release state, the permission control word permits backfilling in the upper layer; in the prohibited state, it prohibits backfilling in the upper layer and vibration without special permission, but permits drying operations; and in the pending review state, it prohibits backfilling in the upper layer. The permission control word refers to the control data that specifies the currently permitted and prohibited operations of the work unit. Specifically, it can be implemented using a data structure that includes the work unit identifier, controller identifier, version number, permitted action, issuance time, and expiration time. By having the road roller and backfilling machinery use the unexpired permission control word as the basis for execution, the rolling rebound judgment result is transformed into a mandatory constraint on the upper layer backfilling process.

[0037] After obtaining the permitted control word and re-determining the rebound duty cycle of the work unit in the prohibited state, it is determined whether it is still greater than the rebound boundary of the same layer. If so, the work unit is placed in the disposal state, and a permitted control word corresponding to the disposal state is issued. The disposal state refers to the state in which the rebound duty cycle of the work unit still exceeds the criterion boundary after drying, and measures such as turning over, draining, adding dry materials, or replacement are required. Two judgments are used here instead of one judgment because a single rebound duty cycle exceeding the limit only indicates that the degree of recovery of the work unit after loading exceeds the normal range of the same layer. Only if it still exceeds the limit after drying is it sufficient to support the transfer to physical disposal.

[0038] It should be noted that the vibration prohibited by the prohibited permit control word refers to conventional vibratory compaction operations without a specific permit. After the drying operation of the work unit is completed, the system generates a recompaction permit control word that limits the work area, vibration conditions, and number of passes. The road roller implements controlled recompaction based on this permit control word. Before performing this vibratory compaction, the representative contact elevation of the static pressure passing through the work unit is obtained as the reference elevation for the new round. After recompaction is completed, the compaction degree test result is obtained again, and a new identification excitation command is issued to redetermine the rebound ratio. This processing method uses the same permit issuance and execution process as recompaction when the compaction degree test is unqualified, and recompaction after the completion of the treatment operation.

[0039] The status of a work unit is assigned in the following order, with each status mutually exclusive: If the response sequence does not meet the extrapolation condition, the rebound compaction ratio is invalid, or the same-layer rebound boundary has not yet formed, it is placed in the "awaiting verification" state; if the compaction test fails, it is placed in the "awaiting verification" state; among work units that have obtained an effective rebound compaction ratio, the same-layer rebound boundary has formed, and the compaction test has passed, those with a rebound compaction ratio not greater than the same-layer rebound boundary are placed in the "released" state, and those greater than the same-layer rebound boundary are placed in the "prohibited" state; if a work unit in the "prohibited" state still has a rebound compaction ratio greater than the same-layer rebound boundary after drying, recompacting, and re-determining the rebound compaction ratio, it is placed in the "disposal" state. Therefore, all work units have a uniquely determined status assignment, and there are no unassigned cases.

[0040] The core innovation of this application lies in using the convergence law of multiple compaction elevations used in the prior art to characterize the compaction in place as an extrapolation tool to remove measurement interference. The control system actively generates measurement conditions for multiple static compactions, and restores the zero-pass free rise elevation, which cannot be directly observed physically, based on its attenuation relationship. The normalization criterion obtained from this is then transformed into permission control words for two types of operating machinery: road rollers and backfilling machinery, forming a process interlock between compaction and backfilling.

[0041] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0042] For example, in a site leveling project for a mountain substation, this scheme was implemented for work unit U031, the third backfill layer, after rain and work resumed. Before vibratory compaction, the roller passed through the site once in static pressure mode, obtaining a representative contact elevation of 1264.3820m. After vibratory compaction, the construction control system issued an identification excitation command to the roller's onboard controller, limiting the vibration to off, the roller loading configuration and travel direction to remain unchanged, the travel speed to be within the 2-3km / h range, and the roller to pass through four times consecutively.

[0043] The representative contact elevations after the roller passes through the vibratory compaction machine four times are 1264.3510m, 1264.3410m, 1264.3350m, and 1264.3312m, forming a response sequence. The first pass of 1264.3510m is the representative contact elevation of the first static compaction after the vibratory compaction.

[0044] The uncertainty of the representative contact elevation difference determined by calibration at this site is 2 mm. The elevation differences between adjacent passes of the response sequence are -10.0 mm, -6.0 mm, and -3.8 mm, respectively. The elevation decreases with each pass, and the absolute value of the elevation difference decreases with each pass, and all are greater than 2 mm, which satisfies the extrapolation condition.

[0045] Extrapolating from the proportional decay relationship, the zero-pass elevation is 1264.36722m, the increase in zero-pass elevation relative to the first pass is 16.22mm, the decrease in representative contact elevation before vibratory compaction relative to the first pass is 31.0mm, and the rebound compaction ratio is 0.523.

[0046] Fifteen work units within the backfill layer have achieved rebound compaction ratios and met the grouping criteria. The rebound boundary of the same layer, determined by the two-stage method described later, is 0.326. The rebound compaction ratio of U031, 0.523, is greater than 0.326, and is therefore deemed to be in a prohibited state. The system sends a permission control word to the backfill machinery controller prohibiting backfilling in the upper layer and a permission control word to the roller vehicle controller prohibiting vibration and permitting the execution of drying operations.

[0047] In contrast, if zero-pass extrapolation is not implemented, and the elevation measured by the return static pressure is directly used as the surface elevation after the rebound, the rebound reading of this work unit will be close to zero, and the rebound duty ratio will be close to zero. It will be judged as a released state and the upper backfill will be allowed. The difference between the two is the amount of suppression of the rebound by the excitation static pressure in this identification.

[0048] Through the above scheme, this application realizes the restoration of unloading recovery amount under the condition that the road roller acts as both a loading device and an elevation acquisition carrier, and directly converts the identification result into a mandatory constraint on the upper backfilling process, so as to prevent the rubber soil area from being covered by the upper backfill when the detection value is qualified.

[0049] This application further proposes a process for determining pre-defined extrapolation conditions, including:

[0050] Obtain the representative contact elevation difference between adjacent iterations in the response sequence. : ;

[0051] Where k is an integer less than N, Let the k-th iteration represent the contact elevation difference. Let the k-th iteration represent the contact elevation. Let be the representative contact elevation for the (k+1)th pass;

[0052] Obtain the uncertainty representing the contact elevation difference ;

[0053] As the representative contact elevation decreases in each pass, The absolute value decreases successively and is always greater than When the condition is met, it is determined that the extrapolation condition is satisfied.

[0054] The above three criteria respectively exclude three types of sequences unsuitable for extrapolation. Each pass represents a progressively decreasing contact elevation, excluding cases where the sequence direction is incorrect, such as elevation increases due to positioning drift or drum vibration. The absolute value decreases successively, excluding the case where the compression does not decay or even diverges; such sequences do not conform to the proportional decay model; the intervals between adjacent passes represent the contact elevation difference. The absolute values ​​of all values ​​are greater than u, which excludes the situation where the elevation difference is submerged in the measurement noise. In this case, the attenuation coefficient calculated from the noise has no physical meaning.

[0055] For example, the representative contact elevations of four passes in a certain work unit are 1264.3510m, 1264.3410m, 1264.3350m, and 1264.3312m, respectively. The elevation differences between adjacent passes are -10.0mm, -6.0mm, and -3.8mm, respectively. The absolute values ​​of 10.0mm, 6.0mm, and 3.8mm decrease with each pass and are all greater than u=2mm, thus satisfying the extrapolation condition. However, the elevation differences between two adjacent passes corresponding to the representative contact elevations of three passes in another work unit are -10.0mm and -1.5mm. The absolute value of the elevation difference -1.5mm is 1.5mm, which is less than u=2mm. This difference is mainly due to measurement error, and therefore does not satisfy the extrapolation condition. This work unit is placed in a pending verification state and no extrapolation calculation is performed.

[0056] Through the above technical solution, this application does not force the calculation of response sequences that do not meet the extrapolation premise, but instead transfers them to a state to be verified and reorganized for identification, thereby avoiding the generation of distorted zero-pass elevation and false rebound duty ratio by invalid data.

[0057] This application further proposes an extrapolation process for zero-pass elevation, including:

[0058] When N is three, according to Determine the proportional attenuation coefficient q;

[0059] in, The second round represents the contact elevation difference. The first round represents the elevation difference of contact.

[0060] When N is not less than four, the absolute value of the representative contact elevation difference between adjacent passes will be used. The uncertainty u, representing the difference in contact elevation, is converted to a corresponding value using the same unit of length. The corresponding values ​​are linearly fitted using the natural logarithm of each iteration, and the fitting formula is as follows: ;

[0061] Where a is a pair The corresponding values ​​are the intercepts obtained by performing a natural logarithmic linear fit on each iteration, and b is the slope of the natural logarithmic linear fit. The result obtained by linear fitting of the natural logarithm The fitted value;

[0062] According to the fitted slope b Determine the proportional attenuation coefficient q, and in each pass The fit is determined to be valid at that time;

[0063] in, This refers to the geometrical attenuation coefficient obtained by exponentially transforming the fitted slope b. The result is obtained by linear fitting based on the natural logarithm. The fitted value;

[0064] when When the zero elevation is determined, use the following formula. Otherwise, the rebound duty cycle is deemed invalid.

[0065] ;

[0066] in, The first representative to come into contact with the elevation.

[0067] The above natural logarithm operations, exponential operations, and fitting residual comparisons are all performed on corresponding values ​​converted using the same length unit; a, b, and q are all dimensionless quantities, and the fitting residuals and u use the same length unit.

[0068] The basis for adopting the proportional decay relationship is that under repeated static pressure, the void ratio of the soil decreases with each pass, and the skeleton gradually becomes denser. Therefore, the incremental compression caused by the same load decreases with each pass, and the decreasing ratio between adjacent passes remains basically stable under the same soil and static pressure conditions. The applicable conditions for this relationship are: each pass uses the same static pressure condition, each pass is located within the same spatial range, each pass is within the same identification event time window, and the soil does not experience particle breakage, local shearing, or lateral displacement during the identification process. When the above conditions are not met, the elevation difference between passes will deviate from the proportional relationship, manifested as the fitting residual exceeding the uncertainty, or the absolute value of the elevation difference no longer decreasing with each pass. In this case, this scheme does not extrapolate but sets the working unit to a state awaiting verification, thus avoiding distorted results based on an inapplicable model.

[0069] The above extrapolation process is based on the fact that the compression of soil by repeated static pressure decreases proportionally with each pass, i.e. .because And when the extrapolation condition is met If the value is less than 0, moving forward one unit yields the elevation increase of the zero-level elevation relative to the first level: This increase is the amount of rise suppressed by the first static pressure of this identification excitation.

[0070] With three passes, there are only two elevation differences, and their ratio is the attenuation coefficient. At this point, there are no independent residuals to test the model. With four or more passes, there are three or more elevation differences. Taking the logarithm of their absolute values ​​allows for linear fitting, and the model's validity is tested by checking whether the deviation between the fitted value and the measured value in the elevation difference domain exceeds u. Fitting is performed in the logarithmic domain while comparing the residuals in the elevation difference domain to ensure that the residuals and the uncertainty u have the same length dimension.

[0071] limited This is because when q approaches zero Significantly amplified, even minute measurement errors will produce unreasonable zero-pass elevations; when q is not less than 1, the compression increment between adjacent passes no longer decays or increases, which does not conform to the proportional decay model.

[0072] When the number of passes is three, there are only two elevation differences between adjacent passes, and their ratio is the geometric attenuation coefficient. There are no independent residuals available for testing the model. In this case, a comparison method within the same layer is used for verification: the geometric attenuation coefficients of other identified and matching work units within the same backfill layer are taken, and their distribution is used to determine the lower quantile value q. m ᵢ n With upper quantile q max A valid attenuation range is defined for the same layer. When the proportional attenuation coefficient determined by this work unit falls outside this range, the rebound duty cycle is deemed invalid and set to a state pending verification. If the number of identified work units within the backfill layer is less than the set number, an initial range determined by the initial calibration test is used, which in one implementation can be 0.20 to 0.90. The purpose of setting this range is to exclude pathological extrapolation: when the proportional attenuation coefficient approaches zero, Significantly amplified, minute measurement errors will produce unreasonable zero-pass elevations; when the compression decays too slowly or ceases to decay near or at a certain point, the stability of the extrapolation results is insufficient, and the proportional decay relationship does not hold.

[0073] For example: The absolute values ​​of the elevation differences over four passes in a certain work unit are 10.0 mm, 6.0 mm, and 3.8 mm. After taking the logarithm, a linear fit is obtained by the number of passes, yielding a slope b = −0.4838. The fitted values ​​for each pass were 9.910 mm, 6.109 mm, and 3.766 mm, with deviations from the measured values ​​of 0.090 mm, 0.109 mm, and 0.034 mm, respectively. All deviations were less than u=2 mm, indicating the fitting was successful. The zero-pass elevation was 1264.3510 + 0.0100 / 0.6164 = 1264.36722 m. If only the first three passes were used, then q = 6.0 / 10.0 = 0.60, and the zero-pass elevation was 1264.3510 + 0.0100 / 0.60 = 1264.36767 m, differing from the fourth pass result by 0.45 mm. The corresponding rebound fill ratios were 0.538 and 0.523, respectively, leading to a consistent conclusion.

[0074] Through the above technical solution, this application provides a determination method under two conditions: three times and more than four times. When there are more than four times, residual testing is introduced to make the extrapolation results verifiable.

[0075] This application further proposes methods for determining the value of the uncertainty u representing the contact elevation difference, including:

[0076] The first uncertainty is determined by obtaining the pre-defined empirical upper quantile value of the absolute value of the difference in representative contact elevation obtained by repeating adjacent identification events on a rigid calibration platform or a pre-compacted and stabilized calibration section. ;

[0077] Among them, the identification event refers to the process in which the road roller continuously completes each pass of static compaction according to the instruction after an identification excitation command is issued;

[0078] The second uncertainty is determined by obtaining the absolute value of the difference between the representative contact elevations obtained from the static compaction before the first identification event on a rigid calibration platform or calibration section. ;

[0079] ;

[0080] The reason for using a rigid calibration platform or a pre-stressed and stabilized calibration section instead of the work unit to be identified for calibration is that the backfill soil of the work unit to be identified will undergo real compression under repeated passage. If this real deformation is included in the uncertainty, the judgment threshold will be raised and the sequence will be changed to be judged as valid.

[0081] Pick and The larger one is because the two correspond to different time spans. The time scale between the representative contact elevations is repeatedly acquired for adjacent identification events, which is usually on the order of tens of seconds. The timescale corresponding to the static pressure passing before vibratory compaction and the first identification of the static pressure passing spans the entire vibratory compaction process, typically on the order of several minutes, including larger positioning drift and attitude changes. Satellite positioning errors are correlated on the scale of seconds to minutes. Using numerical constraints from short-interval calibration to long-interval elevation differences will systematically underestimate the error. Therefore, the larger value is taken as a unified judgment threshold.

[0082] Empirically, the quantile probabilities used for quantile values ​​and the number of calibration passes are determined as follows: Quantile probabilities are selected based on the cost of misjudgment; a higher value results in a stricter judgment threshold, fewer work units judged to meet extrapolation conditions, and a more reliable conclusion. In one implementation, a value of 0.95 is suitable. The number of calibration passes is determined based on the stability of the quantile estimation; the change in the selected quantile value with increasing repetitions should not exceed one-tenth of its original value. In one implementation, a value of at least 20 passes is suitable. Quantiles are calculated using linear interpolation.

[0083] For example: On the hardened surface of the subgrade layer that has passed inspection at a certain site, under the same static pressure conditions as the actual identification excitation, 20 identification events are repeated at 40-second intervals. The empirical 95th percentile value of the absolute value of the difference in representative contact elevation obtained from the repetition of adjacent identification events, which is 1.6 mm, is taken as... Repeat the process 20 times, with a 5-minute time interval between the initial static pressure pass and the first identification static pressure pass. The corresponding empirical 95th percentile value is 2.0 mm. ;Take u=max(1.6,2.0)=2.0mm.

[0084] Through the above technical solution, this application enables the judgment threshold to cover the elevation difference of the two time scales involved in the calculation of the rebound duty ratio, avoiding the underestimation of the error in the denominator and causing a small noise difference to be regarded as an effective drop.

[0085] This application further proposes methods for obtaining representative contact elevations and response sequences, including:

[0086] Obtain the positioning elevation, positioning plane position, and drum structure parameters of the road roller. The drum structure parameters include the drum width, drum radius, and vertical distance from the positioning device to the drum axis.

[0087] The positioning elevation is converted into the roller contact elevation according to the roller structure parameters, and the positioning plane position is extended along the roller axis according to the roller width to form the roller footprint;

[0088] The intersection of the roller footprints before vibration compaction and the static compaction of each identified event is taken to form a common overlapping range; the median value of the roller contact elevation within the common overlapping range is taken as the representative contact elevation.

[0089] Among them, the identification excitation command also limits the allowable deviation range of the same static pressure condition and the time window for identification events;

[0090] Only representative contact elevations of static pressure that are within the allowable deviation range and within the identification event time window are included in the response sequence.

[0091] In one implementation method, the conversion of the roller contact elevation can be achieved by subtracting the vertical distance from the positioning device to the lowest contact point of the roller from the positioning elevation. When there is a horizontal offset between the positioning device and the roller axis, or when there are longitudinal and transverse slopes on the working surface, or when the pitch and roll angles of the roller exceed the allowable range of the calibrated attitude, coordinate transformation can be performed according to the lever vector and attitude rotation matrix between the vehicle coordinate system, the roller coordinate system and the engineering coordinate system. The roller contact elevation is determined by the vertical component of the roller contact reference point obtained by the transformation.

[0092] Using the common overlapping area instead of each pass's individual footprints ensures that the reported elevations from each pass in the comparison come from the same spatial location. If there is a lateral offset in the footprints of each pass, the elevation differences caused by topographic undulations will be mixed into the inter-pass elevation differences and misread as changes in compression. Setting an identification event time window is because the soil continues to rise during multiple static compaction passes. The overlap between the rise and static compression will change the ratio of inter-pass elevation differences, thus distorting the extrapolated zero-pass elevation. Limiting the event duration to within a range where the elevation drift of a stable work unit within the same backfill layer does not exceed u within the same time period can keep this overlap below the measurement uncertainty.

[0093] The overlapping area should meet the following validity conditions: its area as a percentage of the area of ​​the work unit is not less than a set percentage, and the number of valid sampling points for roller contact elevation within it is not less than a set number; the above percentage and number are determined based on the stability of the representative contact elevation, and should ensure that the repeatability of the median value taken in the same pass within this area does not exceed the uncertainty. In one implementation, these can be taken as 0.3 and 20 respectively. When the overlapping area is empty, or if either its area percentage or the number of valid sampling points does not meet the above conditions, this identification does not form a valid representative contact elevation, the work unit is placed in a pending verification state, and a new identification excitation command is issued.

[0094] For example, after taking the intersection of the static compaction marks before the vibration compaction of a certain work unit and the roller footprints of the four identified static compaction passes, the overlapping area accounts for 0.42 of the area of ​​the work unit. This area contains 38 roller contact elevation sampling points, and the median value is taken as the representative contact elevation for that pass. The actual travel speed of the third pass was 3.6 km / h, exceeding the 2-3 km / h range specified in the command; therefore, this pass is not included in the response sequence, and the system reissues the identification excitation command.

[0095] Through the above technical solution, this application ensures that the readings of each pass in the response sequence remain consistent in terms of spatial location, working conditions, and time span, and the elevation difference between each pass thus only reflects the compression effect of the pass on the soil.

[0096] like Figure 2 As shown, a schematic diagram illustrates the overlapping relationship between the proposed backfill layer compaction zone, work unit division, roller travel route, and roller footprint within the target work unit.

[0097] Specifically, the compaction area of ​​the same backfill layer is divided into multiple work units according to the spatial coverage relationship of the construction zones and roller footprints. The dashed lines in the figure represent the boundaries between adjacent work units. Each work unit is equipped with a work unit identifier and a backfill layer identifier to serve as the spatial control object for obtaining contact elevation, calculating rebound compaction ratio, and issuing permit control words. Figure 2The target work unit is represented by U031, and the target work unit is represented by a solid line with a bold boundary.

[0098] The roller travels sequentially through each work unit along a pre-defined back-and-forth route within the backfill layer. Arrows along the route indicate the roller's direction of travel. After completing one compaction route, the roller turns onto an adjacent route and travels in the opposite direction to create continuous coverage of the backfill compaction area. Figure 2 The route shown is used to illustrate the coverage relationship of the road roller over multiple work units, and does not limit the actual route length, turning radius, spacing between adjacent routes, or backfill layer size during construction.

[0099] Figure 2 The enlarged view in section A shows the roller footprints formed by the static pressure passing through the target work unit before vibratory compaction and by multiple passes of static pressure identification after vibratory compaction. The roller footprint is a planar area formed by extending the roller's positioning plane along the roller axis according to the roller width; it is represented in the figure as a wheel track extending in the direction of travel. Before vibratory compaction, the roller passes through the target work unit in a static pressure state, forming a static pressure wheel track before vibratory compaction. After vibratory compaction, the roller, according to the identification excitation command, sequentially performs the first, second, and third passes of static pressure identification under the same defined static pressure conditions, forming corresponding static pressure wheel tracks.

[0100] The identification excitation command specifies that each pass of static compaction uses the same roller identification, drum loading configuration, and travel direction, and ensures that the travel speed is within the corresponding allowable deviation range. When performing each pass of identification static compaction, the roller can turn around or reset its route outside the target work unit before passing through the target work unit in the same direction to avoid changes in travel direction affecting the drum contact elevation. Due to positioning errors, route tracking deviations, and on-site steering corrections, the drum footprints formed by each static compaction pass may not perfectly overlap.

[0101] To facilitate the differentiation of the roller tracks corresponding to each static compaction pass, the enlarged view in section A shows the roller tracks staggered longitudinally along the image. This staggered arrangement is merely a stylized representation and does not indicate an actual lateral offset of the illustrated size within the work unit for each pass. In actual processing, the roller tracks of the static compaction pass before vibratory compaction and each identified static compaction pass are registered according to a unified work unit coordinate system. The intersection of the registered roller tracks is then taken to obtain the common overlapping range.

[0102] The common overlap range refers to the spatial area actually covered by the static pressure passing through before vibratory compaction and by the static pressure passing through each pass of identification. Figure 2The area is represented by a diagonal line. The median value is determined from the roller contact elevation samples generated within the common overlapping area of ​​each static compaction pass, and this median value is used as the representative contact elevation for the corresponding static compaction pass. This ensures that the static compaction pass before vibratory compaction corresponds to the same spatial range as the representative contact elevation of each identified static compaction pass, avoiding the misinterpretation of roller route deviation, roller coverage changes, or local terrain differences within the work unit as elevation changes between passes. This application defines the work unit as a control area divided according to the spatial overlap relationship of the roller footprints, and uses the median value of the roller contact elevation within the common overlapping area as the representative contact elevation.

[0103] Figure 2 Three passes of static pressure identification are used as an example of at least three passes. When the identification excitation command specifies four or more passes of static pressure identification, the wheel tracks of subsequent passes of static pressure identification are formed in the same manner. The intersection of the roller tracks passed by static pressure before vibration compaction and the roller tracks passed by all valid static pressure identifications is taken to update the common overlap range. Static pressure that is not within the allowable deviation range of the static pressure condition specified by the identification excitation command, or that is not within the identification event time window, does not participate in the formation of the response sequence.

[0104] It should be noted that, Figure 2 To clearly illustrate the overlapping relationship, three rounds of static pressure identification are used as a diagram; in this embodiment, the static pressure is identified four times for the U031 working unit, therefore... Figure 2 Based on the three-pass wheel track pattern shown, a fourth pass of static pressure wheel track pattern is formed, and the intersection of the static pressure wheel track pattern before vibration compaction and the four-pass static pressure wheel track pattern is taken. The number of passes shown in the attached figure does not constitute a limitation on the actual number of passes required by the identification excitation command.

[0105] This application further proposes a process for determining the same-layer springback boundary, including:

[0106] Other work units within the same backfill layer that have already achieved a rebound compaction ratio, passed the compaction test, have not increased in moisture content relative to the test value before the vibratory compaction of the work unit, and whose vibratory compaction conditions and number of passes are within the corresponding allowable deviation range of the work unit are used as the initial reference units.

[0107] The empirical upper quantile value of the rebound duty cycle of the initially selected reference unit is taken as the temporary boundary. ;

[0108] Eliminate reference cells with a springback duty cycle greater than [missing information]. The abnormal reference element is used, and the empirical upper quantile value of the rebound duty ratio of the remaining reference elements is taken as the rebound boundary of the same layer. .

[0109] The two-stage determination method, rather than a single upper quantile value, is used because the initial selection of reference units may include operational units that pass the compaction test but are actually unstable. These units have a higher rebound compaction ratio; if included in the boundary calculation, they would raise the criterion threshold, causing the actual rubber soil area to be classified as released. By first forming a temporary boundary and using it to eliminate abnormal reference units, and then forming the formal boundary from the remaining reference units, the aforementioned situation can be avoided.

[0110] The reason for limiting the vibratory compaction conditions and number of passes of the reference unit and the unit to be judged to be within the corresponding allowable deviation range is that the rebound compaction ratio reflects the degree of soil recovery after loading under a specific vibration input. If the reference unit uses different amplitudes, frequencies, or number of compaction passes, the difference in its rebound compaction ratio will include the difference in construction input, making it incomparable to the unit to be judged.

[0111] Empirically, the quantile probability, the preset minimum number of reference units, and the upper limit of the rebound boundary used for quantile values ​​are determined as follows: The quantile probability is selected based on the distribution coverage of normal rebound in the same layer, and should ensure that the proportion of normally compacted work units judged as prohibited is within an acceptable range. In one implementation method, it can be taken as 0.90. The preset minimum number is determined based on the stability of the quantile estimation, and should ensure that the change in the boundary obtained when adding a reference unit does not exceed one-tenth of the boundary itself. In one implementation method, the initial selection of reference units should be no less than 10, and the remaining reference units should be no less than 8. The upper limit of the rebound boundary is determined by the initial calibration test of the backfill layer. The upper envelope value of the rebound occupancy ratio of the seed reference unit that has passed the compaction test in the calibration test and has been independently verified to have no abnormal rebound is taken. When the rebound boundary of the same layer exceeds the upper limit, it indicates that the overall rebound level of most work units in the backfill layer is too high. At this time, no rebound boundary of the same layer is formed, and the relevant work units are set to the state of pending verification.

[0112] For example: Within a certain backfill layer, 15 work units have achieved rebound fill ratios and meet the inclusion criteria, with rebound fill ratios of 0.18, 0.19, 0.21, 0.22, 0.22, 0.24, 0.25, 0.26, 0.27, 0.29, 0.31, 0.33, 0.36, 0.48, and 0.52, respectively. Using linear interpolation, the empirical 90th percentile value of 0.432 is taken as the temporary boundary. After removing two anomalous reference units with values ​​greater than 0.432 (0.48 and 0.52), the empirical 90th percentile value of the remaining 13 reference units is 0.326, which is used as the same-layer springback boundary. If the empirical 90th percentile value of all 15 units is taken directly without elimination, the boundary will be 0.432. The working unit with a springback duty cycle of 0.42 will be judged as the released state; after two-stage determination, the working unit will be judged as the prohibited state.

[0113] Through the above technical solution, this application enables the criterion boundary to be endogenously formed by qualified samples of the same layer, time and process, and suppresses the lifting effect of individual abnormal samples on the boundary.

[0114] This application further proposes the determination and processing procedure for the state to be verified, including:

[0115] The process of determining the state to be verified also includes:

[0116] When the drop C is not greater than u, or the zero-pass elevation, or the rebound compaction ratio cannot form a finite value, the rebound compaction ratio is deemed invalid, and the work unit is set to a pending review state; where drop refers to the difference between the representative contact elevation passed by the static pressure before vibratory compaction and the first pass.

[0117] And when the number of initially selected reference units and the number of remaining reference units both reach the preset minimum number, it is formed Otherwise, it is determined that the same-layer rebound boundary has not been formed, and the work unit is set to the pending verification state;

[0118] The processing of the state to be verified includes:

[0119] When the response sequence does not meet the extrapolation condition or the springback duty cycle is invalid and the state is set to pending verification, the identification excitation command is reissued.

[0120] When the layer is set to a pending verification state because the rebound boundary of the same layer has not been formed, continue to obtain the rebound occupancy ratio of other work units in the same backfill layer until the rebound boundary of the same layer is formed.

[0121] When the compaction test fails and the system is placed in a state pending review, a permission control word is issued to allow recompaction under limited vibration conditions and with a specified number of passes. After recompaction, the compaction test results and rebound ratio are obtained again.

[0122] The descent C is limited to be greater than u because C is the denominator of the rebound duty cycle. When C is close to zero or less than the measurement uncertainty, its value is mainly composed of measurement error, and the resulting rebound duty cycle will be significantly amplified or even fail to form a finite value. In this case, the judgment is meaningless.

[0123] The processing actions for the pending verification state are determined according to its causes because different causes require different recovery paths. An invalid response sequence or invalid rebound percentage is caused by the quality of the data identified in this instance; reorganizing the identification process may resolve this. The failure to form a rebound boundary within the same layer is due to insufficient reference samples within that backfill layer; repeated static compaction will not generate new reference units, and it is necessary to wait for other work units in that layer to complete their identification. A failure to pass the compaction test is due to the soil itself not being properly compacted; static compaction verification cannot improve the compaction degree, and vibration compaction must be implemented again. If a uniform re-static compaction verification is applied to all three types of causes, the work units for the latter two types of causes will remain in the pending verification state without a recovery path.

[0124] For example: If the difference between the representative contact elevation before vibratory compaction and the representative contact elevation of the first pass in a certain work unit is 1.4 mm, which is less than u=2 mm, the rebound compaction ratio is deemed invalid, and the system is placed in a pending review state and a new identification excitation command is issued. If the compaction degree test result of another work unit is unqualified, the system issues a permission control word to perform recompaction with limited vibration conditions and number of passes. The roller performs recompaction accordingly, and after obtaining a qualified compaction degree test result, a new identification excitation command is issued and the rebound compaction ratio is re-determined.

[0125] Through the above technical solution, this application enables all types of causes to be reviewed to have a definite recovery path, and the work unit will not remain in the state of pending review due to the mismatch between the cause and the processing action.

[0126] This application further proposes a process for determining the disposal license type of the disposal state, including:

[0127] The identification events before and after drying of the work unit are obtained. The representative contact elevation of both events is the median value of the roller contact elevation within the intersection of the common overlapping range of the two identification events before and after drying. The same vibration rolling conditions and number of passes are used before and after drying.

[0128] For the identification events before and after drying, the infimum and supremum of the rebound duty ratio of the identification event within the uncertainty range representing the contact elevation difference are taken to form the pre-drying interval and the post-drying interval; when a finite infimum and supremum cannot be formed, it is determined that the corresponding interval has not been formed.

[0129] Calculate the lower bound of the drying response:

[0130] ;

[0131] in, This is the lower boundary of the area before drying. This is the upper boundary of the area after drying;

[0132] when When the value is greater than zero, the permit control word for the disposal state permits the execution of one additional drying or turning operation;

[0133] when If the value is not greater than zero, or if at least one of the pre-drying and post-drying zones is not formed, the permit control word for the treatment state prohibits drying alone and permits the performance of at least one of the following treatment operations: drainage, mixing in dry materials, or replacement.

[0134] The difference between the lower bound of the pre-drying interval and the upper bound of the post-drying interval, rather than the direct difference between the two rebound pressure ratios, is used because the rebound pressure ratio is calculated from the elevation difference on the order of millimeters, and small differences between the two calculations may be entirely due to measurement errors. Subtracting the maximum possible value after drying from the minimum possible value before drying determines whether a decrease still exists under the worst-case scenario. A difference greater than zero means that the two intervals do not overlap, and the rebound pressure ratio before drying is definitely higher than that after drying, thus concluding that drying has produced a identifiable improvement.

[0135] This process only identifies whether drying produces a distinguishable improvement, without determining the physical cause of rebound. The response sequence and rebound ratio are observable deformation responses under repeated static pressure from the roller, rather than direct measurements of pore water pressure, soil elastic modulus, or underlying layer stiffness. The surface high-order sequence alone cannot uniquely infer the internal mechanism of the soil. Therefore, if there is no distinguishable improvement, it is not directly identified as a gradation problem or an underlying layer problem. Instead, further drying is prohibited, and a combined treatment is initiated.

[0136] For example: The uncertainty u of the site where a certain processing unit is located is 1.0 mm. Before drying, the measured values ​​of the identified events are d1 = −30.0 mm, d2 = −18.0 mm, d3 = −11.0 mm, and C = 70.0 mm, with a rebound duty cycle of 0.708, and the interval is [0.635, 0.791]. After drying and recompacting, the measured values ​​of the identified events are d1 = −14.0 mm, d2 = −9.0 mm, d3 = −5.8 mm, and C = 62.0 mm, with a rebound duty cycle of 0.351, and the interval is [0.285, 0.435]. The lower bound of the drying response is 0.635 − 0.435 = 0.200, which is greater than zero. The two intervals do not overlap, indicating that drying has produced a recognizable improvement, and one additional drying operation is permitted.

[0137] The other treatment unit, before drying, had a range of [0.635, 0.791]. After drying and recompacting, the measured values ​​were d1 = −28.0 mm, d2 = −17.0 mm, d3 = −10.5 mm, and C = 69.0 mm, with a rebound ratio of 0.663, ranging from [0.591, 0.745]. The lower bound of the drying response was 0.635 − 0.745 = −0.110, which is not greater than zero. The two ranges overlapped, and this drying did not produce a identifiable improvement. Therefore, continued individual drying was prohibited, and a combined treatment of drainage and backfilling was initiated.

[0138] Through the above technical solution, this application eliminates the interference of measurement error on the judgment of treatment effect in the most conservative way. For the work units with distinguishable response to drying, low-cost drying or turning treatment is continued. For the work units with no distinguishable response, they are promptly transferred to combined treatment to avoid endless repeated drying and the occupation of the construction period.

[0139] This application further proposes a process for determining the infimum and supremacy, including:

[0140] For the identified event, obtain the representative contact elevation difference between each adjacent pass that participates in the calculation of the rebound duty ratio. to and the decrease C;

[0141] will with Values ​​that differ by no more than u are denoted as Let C' denote the value that differs from C by no more than u, that is:

[0142] and ;

[0143] Depend on to Together with C′, they form a set of values;

[0144] Where n is the static pressure pass number of the identification event, and its value is the same as N, k=1 to n−1; Let be the representative contact elevation difference between the kth adjacent passes as measured, C be the measured drop, and u be the uncertainty of the contact elevation difference. C and C′ represent the measurement uncertainty range, respectively. The possible values ​​of C;

[0145] To make to For each set of values ​​that satisfies the extrapolation condition and C′ is greater than zero, by to The equal attenuation coefficient and the zero-pass elevation are redefined, and the ratio of the increase in the zero-pass elevation relative to the first pass to C′ is used as the rebound duty ratio corresponding to this set of values.

[0146] Take the infimum and supremum of all rebound-to-compression ratios; when there is no valid value group that meets the conditions, it is determined that finite infimum and supremum cannot be formed.

[0147] The essence of the above process is that each measured value has a measurement error, and its true value is not a fixed value, but lies within a range centered on the measured value with u as the radius. One possible value of each variable involved in the calculation is selected to form a value group, each value group corresponds to a possible rebound-to-compression ratio, and the infimum and supremum of the rebound-to-compression ratios corresponding to all value groups constitute the rebound-to-compression ratio interval of this identification event.

[0148] Since the rebound-to-compression ratio is not a monotonic function for each input variable, its infimum and supremum do not necessarily appear at the combination where all input variables take the upper bound or the lower bound at the same time. Therefore, in one implementation, constrained global optimization can be adopted for solution, taking the rebound-to-compression ratio corresponding to each value group as the objective function, with , , the extrapolatable condition, 0<q'<1 and C'>0 as constraints, to solve for its minimum value and maximum value respectively; in another implementation, interval branch and bound can be adopted, each input interval is recursively divided, the conservative upper and lower bounds of the rebound-to-compression ratio are calculated for each subinterval and the subintervals that do not meet the constraints are excluded, until the difference between the upper and lower bounds does not exceed the preset calculation accuracy.

[0149] For example: the measured values of a certain identification event are d1=−10.0mm, d2=−6.0mm, d3=−3.8mm, C=31.0mm, u=2.0mm, and the rebound-to-compression ratio calculated according to the measured values is 0.523. Under the constraints that each variable varies within the range of 2.0mm above and below its measured value, and meets the requirements of decreasing pass by pass, the absolute value decreasing pass by pass, all being greater than u, the fitting residual not exceeding u, and C' being greater than zero, the obtained infimum of the rebound-to-compression ratio is 0.285, the supremum is 1.013, and the interval width is 0.728.

[0150] The width of the above interval depends on the ratio of the representative contact elevation difference between each adjacent pass to the uncertainty.

[0151] To illustrate the uncertainty amplification effect of the last elevation difference, under the condition that the number of static pressure passes is four, there are to three elevation differences between adjacent passes, and the three elevation differences satisfy the ideal geometric proportional relationship, the geometric proportional attenuation coefficient can be equivalently expressed as: , so the elevation rise amount satisfies , that is The relative uncertainty of the final term's elevation difference is significantly amplified when |d1| is 1.5 and |d3| is −0.5. In the example above, |d3| is 3.8 mm and u is 2.0 mm, resulting in a relative uncertainty exceeding 50% and a wider interval. For comparison, at another site, after base station densification, u is 1.0 mm. The measured values ​​for a certain identified event are d1 = −30.0 mm, d2 = −18.0 mm, d3 = −11.0 mm, and C = 70.0 mm. The rebound duty cycle calculated based on the measured values ​​is 0.708, resulting in an interval [0.635, 0.791] with a width of 0.156.

[0152] Therefore, when the ratio of the representative contact elevation difference to the uncertainty between adjacent passes is insufficient, the resulting interval is too wide to distinguish the changes before and after drying. In this case, the lower bound of the drying response is not greater than zero, and the treatment is diverted to combined treatment as described later. The failure direction is to no longer use low-cost individual drying but directly adopt stronger treatment measures, and will not misjudge unimproved work units as improved.

[0153] Through the above technical solution, this application expands the single rebound pressure ratio value into an interval that takes into account the measurement uncertainty, so that the judgment of the subsequent drying response is based on a definite mathematical meaning, rather than relying on an artificially set comparison tolerance.

[0154] Example 2:

[0155] like Figure 3 As shown, this application provides an interlock control system for the high fill backfilling and compaction process, used to implement the above-mentioned interlock control method for the high fill backfilling and compaction process. The system includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the above-mentioned interlock control method for the high fill backfilling and compaction process.

[0156] The system proposed in this embodiment belongs to the same inventive concept as the method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0157] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0158] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A method for interlocking control of backfilling and compaction processes in high-fill areas, characterized in that, include: Obtain the representative contact elevation of the static pressure passing through the work unit before the road roller vibrates and compacts on the work unit, wherein the work unit is one of multiple work units divided into the compaction area of ​​the same backfill layer; Under the same static pressure condition after vibratory compaction, an identification excitation command is sent to the on-board controller of the road roller, and the N representative contact elevations returned are arranged into a response sequence according to the number of passes. The same static pressure condition refers to the condition used before the static compaction before vibratory compaction. The identification excitation command includes N static compaction passes, where N is a positive integer and not less than 3. Determine whether the response sequence meets the preset extrapolation conditions. If so, extrapolate it to obtain the zero-pass elevation. Calculate the increase in zero-pass elevation relative to the first pass and the decrease in representative contact elevation passed by static pressure before vibratory compaction relative to the first pass. Calculate the ratio of the increase to the decrease as the rebound load ratio. Otherwise, set the work unit to a pending review state. Wherein, the first pass is the representative contact elevation passed by the first static pressure after vibratory compaction. The rebound boundary of the same layer is determined based on the rebound occupancy ratio of other work units within the same backfill layer. Determine whether the rebound compaction ratio of the working unit is greater than the rebound boundary of the same layer. If so, set the working unit to the state to be reviewed. Otherwise, obtain the compaction test result of the working unit. If the result is qualified, set the working unit to the state of release. Generate permission control words corresponding to the release state, pending review state, and prohibited state of the work unit and send them to the on-board controller of the road roller and the controller of the backfilling machinery; After obtaining the springback duty cycle of the prohibited work unit and processing it with the permission control word, determine whether it is still greater than the springback boundary of the same layer. If so, set the work unit to the disposal state and issue the permission control word corresponding to the disposal state.

2. The interlocking control method for the high fill backfilling and compaction process according to claim 1, characterized in that, The process for determining the pre-defined extrapolation conditions is as follows: Obtain the representative contact elevation difference between adjacent iterations in the response sequence. : ; Where k is an integer less than N, Let the k-th iteration represent the contact elevation difference. Let the k-th iteration represent the contact elevation. Let be the representative contact elevation for the (k+1)th pass; Obtain the uncertainty representing the contact elevation difference ; As the representative contact elevation decreases in each pass, The absolute value decreases successively and is always greater than When the condition is met, it is determined that the extrapolation condition is satisfied.

3. The interlocking control method for the high-fill backfill compaction process according to claim 2, characterized in that, The extrapolation process for calculating the zero-pass elevation is as follows: When N is three, according to Determine the proportional attenuation coefficient q; in, The second round represents the contact elevation difference. The first round represents the elevation difference of contact. When N is not less than four, the absolute value of the representative contact elevation difference between adjacent passes will be used. The uncertainty u, representing the difference in contact elevation, is converted to a corresponding value using the same unit of length. The corresponding values ​​are linearly fitted using the natural logarithm of each iteration, and the fitting formula is as follows: ; Where a is a pair The corresponding values ​​are the intercepts obtained by performing a natural logarithmic linear fit on each iteration, and b is the slope of the natural logarithmic linear fit. The result obtained by linear fitting of the natural logarithm The fitted value; According to the fitted slope b Determine the proportional attenuation coefficient q, and in each pass The fit is determined to be valid at that time; in, This refers to the geometrical attenuation coefficient obtained by exponentially transforming the fitted slope b. The result is obtained by linear fitting based on the natural logarithm. The fitted value; when When the zero elevation is determined, use the following formula. Otherwise, the rebound duty cycle is deemed invalid. ； in, The first representative to come into contact with the elevation.

4. The interlocking control method for the high fill backfilling and compaction process according to claim 2, characterized in that, Uncertainty representing the contact elevation difference The value is determined as follows: The first uncertainty is determined by obtaining the pre-defined empirical upper quantile value of the absolute value of the difference in representative contact elevation obtained by repeating adjacent identification events on a rigid calibration platform or a pre-compacted and stabilized calibration section. ; Among them, the identification event refers to the process in which the road roller continuously completes each pass of static compaction according to the instruction after an identification excitation command is issued; The second uncertainty is determined by obtaining the absolute value of the difference between the representative contact elevations obtained from the static compaction before the first identification event on a rigid calibration platform or calibration section. ; 。 5. The interlocking control method for high-fill backfill compaction process according to claim 4, characterized in that, The methods for obtaining the contact elevation and response sequence are as follows: Obtain the positioning elevation, positioning plane position, and drum structure parameters of the road roller. The drum structure parameters include the drum width, drum radius, and vertical distance from the positioning device to the drum axis. The positioning elevation is converted into the roller contact elevation according to the roller structure parameters, and the positioning plane position is extended along the roller axis according to the roller width to form the roller footprint; The intersection of the roller footprints before vibration compaction and the static compaction of each identified event is taken to form a common overlapping range; the median value of the roller contact elevation within the common overlapping range is taken as the representative contact elevation. Among them, the identification excitation command also limits the allowable deviation range of the same static pressure condition and the time window for identification events; Only representative contact elevations of static pressure that are within the allowable deviation range and within the identification event time window are included in the response sequence.

6. The interlocking control method for the high-fill backfill compaction process according to claim 5, characterized in that, The process for determining the same-layer springback boundary is as follows: Other work units within the same backfill layer that have obtained a rebound compaction ratio, passed the compaction test, have not increased moisture content, and whose vibration rolling conditions and number of passes are within the corresponding allowable deviation range of the work unit are used as the initial selection reference units. The preset empirical upper quantile value of the rebound duty cycle of the initial reference unit is taken as the temporary boundary; Abnormal reference elements with a springback duty cycle greater than the temporary boundary are removed from the initial selection reference elements. The preset empirical upper quantile value of the springback duty cycle of the remaining reference elements is taken as the springback boundary of the same layer.

7. The interlocking control method for high fill backfill compaction process according to claim 6, characterized in that, The process of determining the state to be verified also includes: When the decrease is not greater than If the zero-pass elevation or rebound compaction ratio cannot form a finite value, the rebound compaction ratio is deemed invalid, and the work unit is set to a pending review state; where, the drop refers to the difference between the representative contact elevation passed by the static pressure before vibratory compaction and the first pass; And when the number of the initially selected reference unit and the remaining reference unit both reach the preset minimum number, the same-layer springback boundary is formed; otherwise, it is determined that the same-layer springback boundary has not been formed, and the working unit is set to the pending verification state. The processing of the state to be verified includes: When the response sequence does not meet the extrapolation condition or the springback duty cycle is invalid and the state is set to pending verification, the identification excitation command is reissued. When the layer is set to a pending verification state because the rebound boundary of the same layer has not been formed, continue to obtain the rebound occupancy ratio of other work units in the same backfill layer until the rebound boundary of the same layer is formed. When the compaction test fails and the system is placed in a state pending review, a permission control word is issued to allow recompaction under limited vibration conditions and with a specified number of passes. After recompaction, the compaction test results and rebound ratio are obtained again.

8. The interlocking control method for the high fill backfilling and compaction process according to claim 7, characterized in that, The process for determining the permission control word for the disposal state is as follows: The identification events before and after drying of the work unit are obtained. The representative contact elevation of both events is the median value of the roller contact elevation within the intersection of the common overlapping range of the two identification events before and after drying. The same vibration rolling conditions and number of passes are used before and after drying. For the identification events before and after drying, the lower and upper bounds of the rebound duty ratio of the identification events within the uncertainty range representing the contact elevation difference are taken to form the pre-drying interval and the post-drying interval. When a finite infimum and supremum cannot be formed, the corresponding interval is determined to be unformed. Calculate the lower bound of the drying response ,in, This is the lower boundary of the area before drying. This is the upper boundary of the area after drying; when When the value is greater than zero, the permit control word for the disposal state permits the execution of one additional drying or turning operation; when If the value is not greater than zero, or if at least one of the pre-drying and post-drying zones is not formed, the permit control word for the treatment state prohibits drying alone and permits the performance of at least one of the following treatment operations: drainage, mixing in dry materials, or replacement.

9. The interlocking control method for the high fill backfilling and compaction process according to claim 8, characterized in that, The process of determining the infimum and supremacy is as follows: For the identified event, obtain the representative contact elevation difference between each adjacent pass that participates in the calculation of the rebound duty ratio. to and the amount of decline ; will with The difference is no more than The value of is denoted as , will with The difference is no more than The value of is denoted as ,Right now and ,Depend on to and Form a set of values; Where n is the number of static pressure passes for the identified event, which is the same as the value of N. Let be the representative contact elevation difference between the kth adjacent passes. and These represent the measurement uncertainty range, respectively. and Possible values; To make to Satisfies the extrapolation condition and For each group of values ​​greater than zero, by to The proportional attenuation coefficient and the zero-pass elevation were redefined, and the rise of the zero-pass elevation relative to the first pass was used as the new zero-pass elevation. The ratio of the two values ​​is used as the rebound duty ratio corresponding to that value group; Take the infimum and supremum from all rebound duty ratios; if there is no set of values ​​that meet the conditions, it is determined that a finite infimum and supremum cannot be formed.

10. An interlocking control system for the backfilling and compaction process of high fill, characterized in that, It includes a processor and a memory, the memory storing a computer program, which, when executed by the processor, causes the processor to perform the interlock control method for the high fill backfilling and compaction process as described in any one of claims 1 to 9.

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