314 results about "Subgrade" patented technology

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention belongs to the technical field of road engineering roadbed nondestructive testing, discloses a roadbed humidity nondestructive testing method based on wireless radio frequency signal multi-parameter inversion, and aims to solve the problems that a traditional roadbed humidity testing method is destructive, low in efficiency and discontinuous in monitoring or detection parameters are easily interfered. The method specifically comprises the following steps of: firstly, embedding an RFID tag and acquiring an on-site received signal strength indication value; then establishing a relation model of the received signal strength indication value and the roadbed moisture content, and extracting characteristic parameters only influenced by the moisture content; then, constructing a neural network model, taking the extracted characteristic parameters as input, and utilizing field data to train the model to invert the roadbed moisture content; and finally, the spatial distribution of the moisture content of the roadbed is obtained by combining the distribution of the test points and the roadbed structure information, so that the efficient, non-contact and continuous monitoring of the humidity state of the roadbed is realized.

The invention relates to a crack detection method and system for expressway construction. The method comprises the following steps: acquiring a multi-modal sensing data set containing multispectral, three-dimensional point cloud and polarized light data on the surface of a highway to be detected, generating a multi-dimensional fusion image, and classifying to obtain a detection scene type; obtaining interference judgment parameters in combination with a preset scene-threshold mapping model; then layering and filtering interference to obtain an effective fusion image; geometric and thermodynamic parameters of the crack are extracted, working condition background data such as historical detection, environment and traffic are combined, a complete-cycle comprehensive risk value and roadbed residual bearing capacity are obtained, and finally a grading detection report is generated. By adopting the method, the crack risk and the roadbed bearing capacity can be quantified, and the reliability of complex scene detection and the scientificity of maintenance decision are improved.

The invention discloses a highway roadbed construction quality early warning method and system based on multi-modal data, and belongs to the field of construction quality control, and the method comprises the steps: obtaining multi-modal construction data, and carrying out the time-space alignment and feature fusion processing, generating a spatio-temporal data tensor representing the states of the plurality of discrete grid units under the continuous time step length; inputting the spatio-temporal data tensor into a preset deep learning prediction model, wherein the deep learning prediction model comprises a spatial feature extraction module and a time-dependent modeling module which are connected in series; extracting a convolutional neural network through a spatial feature extraction module; processing a time sequence of the local spatial correlation characteristics through a recurrent neural network of a time-dependent modeling module; predicting and outputting a future quality index for at least one target grid unit in the plurality of discrete grid units; and an instruction for performing process control on subsequent construction is generated. According to the invention, refined guidance of the construction process is realized.

The invention is applicable to the technical field of road construction, and provides a digging and filling method for highway subgrade construction, which comprises the following steps: T1, carrying out construction operation according to a construction drawing, digging a pavement through a digging machine to form a groove, and piling dug soil on the ground on two sides of the groove; t2, the grooves are evenly filled with filling materials such as stone, coal cinder and gravel; t3, the road roller is controlled to slowly move along the foundation pit, a soil returning device at the front end of the road roller is used for backfilling soil on the two sides of the foundation pit, and a compaction steel wheel at the rear end of the road roller is used for compacting the backfilled groove; the soil returning device comprises a fixing assembly and a backfilling assembly arranged on the fixing assembly in a sliding mode. According to the method, the rotating shaft is controlled to rotate to drive the two sets of spiral conveying blades with opposite spiral directions to synchronously rotate, most of soil on the two sides of the groove is conveyed into the groove, the two sets of bulldozing plates are driven to push the residual coating into the groove through linkage of all the parts, and the backfilling efficiency is improved.

The utility model provides a deep perforating device for roadbed settlement reinforcement, which relates to the technical field of building construction and comprises a triangular bottom plate. Three groups of balance plates are annularly arranged on the triangular bottom plate, a supporting vertical plate is vertically arranged on the upper end face of the triangular bottom plate, a triangular top plate is fixedly connected to the top of the supporting vertical plate, and two guide columns are fixedly connected between the triangular top plate and the triangular bottom plate; by arranging the drilling and smoothing mechanism, after drilling operation is completed, a rotating rod slowly stretches out towards the earth surface direction, meanwhile, reverse accelerated rotating motion is conducted, and by means of inertia of an inertia balance weight piece, a traction rod forwards pushes a balance weight block to be separated towards the outer side; at the moment, the smoothing arc plate makes contact with the inner wall of the drill hole, the balancing weight exerts pressure, and the smoothing arc plate is tightly attached to the inner wall of the drill hole to do high-speed rotating motion, so that the inner wall is smoothed, the concave-convex degree of the inner wall is effectively reduced, and favorable conditions are created for follow-up steel bar implanting work; the problem that after an existing foundation punching device completes punching operation, the hole wall is obviously uneven is solved.

The invention relates to the technical field of highway safety, and particularly discloses a highway subgrade rolling stone early warning method and system. The method comprises the following steps: collecting vibration data along a highway subgrade by using a distributed optical fiber sonic sensor; constructing an original event data set, simulating a rolling stone event by throwing stones and collecting blocking event vibration data in a normal traffic flow, generating a vibration energy distribution diagram, and identifying and marking energy high-value point locations to obtain data fragments; carrying out sample expansion processing on the rolling stone event data fragments, and carrying out stratified sampling and clustering analysis on the blocking event data fragments to form a balanced final event data set; converting the vibration data into a two-dimensional spectrogram; training the spectrogram by using a multi-scale convolutional neural network model; and classifying real-time vibration data by using the trained model, and accurately identifying a rolling stone event and a blocking event. The system comprises a data acquisition module, a data set preprocessing module, a feature conversion module and an intelligent identification module. Through efficient data processing and a deep learning model, rolling stone and interference events can be effectively distinguished, and the early warning precision and reliability are improved.

The invention relates to the technical field of roadbed detection, and discloses a roadbed compaction quality detection method based on ultrasonic wave collaboration, and the roadbed compaction quality detection method comprises the following steps: collecting full-wave band ultrasonic echo signals, and obtaining current environment data; calculating a longitudinal wave speed, a transverse wave speed and a wave speed ratio, and extracting an attenuation coefficient and a frequency dispersion characteristic of the ultrasonic echo signal to obtain an acoustic characteristic set; inputting the acoustic feature set and the environmental data into an environmental compensation model, outputting a standard acoustic parameter set subjected to temperature, humidity and water content correction, analyzing the standard acoustic parameter set through a soil texture classification algorithm, and judging the current soil texture type; and combining the standard acoustic parameter set and the current soil texture type into a multi-dimensional feature vector, inputting the multi-dimensional feature vector into a compactness calculation model, and calculating to obtain a roadbed compactness value of the current measuring point. According to the method, high-precision compaction degree numerical calculation is realized, and intelligent and visual whole-process support is provided for roadbed construction quality.

This invention relates to a support structure and construction method for rapid repair of landslide-affected roadbed slopes, belonging to the field of roadbed engineering emergency repair. The support structure is a pile-slab support structure, composed of steel piles and hollow precast diaphragms. The steel piles include bottom segments, standard segments, splicing pins, and splicing bolts. Both the bottom and standard segments include multiple splicing grooves at their top. The hollow precast diaphragms include bottom segments, standard segments, splicing pins, and splicing bolts. Both bottom and standard segments include multiple splicing grooves at their top. The pile-slab support structure of this invention features simple construction, high efficiency and convenience, high strength, good versatility, safety and reliability, wide applicability, and energy saving and economy. It can be used to achieve rapid restoration of traffic on damaged roads and provide a closed, efficient, and safe construction environment for rapid repair of landslide-affected roadbed slopes.

The invention discloses a rolling device for railway roadbed construction filler, and relates to the technical field of soil compaction. The rolling device for the railway roadbed construction filler comprises a device main body, the device main body comprises a vehicle body, a mounting frame connected with the vehicle body and a grinding roller connected with the mounting frame; the device main body further comprises two groups of auxiliary rolling mechanisms for rolling the edge and the side slope of the roadbed. According to the rolling device for the railway roadbed construction filler, the roadbed edge and the side slope are recognized through the recognition mechanism, the auxiliary rolling wheel extends out through the adjusting mechanism and the rotating mechanism according to the recognition result, the inclination angle of the auxiliary rolling wheel is adjusted, the auxiliary rolling wheel makes contact with the roadbed edge or the side slope, and pressure is applied under the action of the pressure applying mechanism; according to the roadbed edge rolling device, rolling operation of a roadbed edge pre-pressing locking edge or a side slope is achieved, the roadbed edge rolling device is more convenient and faster, the filler can be prevented from sliding and collapsing towards the side slope, rolling blind areas can be avoided, and the rolling efficiency and quality are improved.

This invention discloses a modeling method for layered soft soil subgrades reinforced with pile foundations under simulated seismic loading, belonging to the field of seismic numerical simulation in geotechnical engineering. This method constructs a multi-field coupled numerical model based on a finite element platform, defines the contact mechanisms at the pile-soil and reinforced-subgrade interfaces, and completes the construction of in-situ stress equilibrium and initial pore water pressure fields. Static results are output through fill-consolidation coupling analysis. Distributed viscoelastic artificial boundaries are automatically constructed using Python scripts, and seismic waves are converted into equivalent nodal loads using wave theory. Multi-physics field connections between static and dynamic analysis boundaries are achieved, and core response parameters such as embankment settlement and pile-soil stress are output through implicit dynamic analysis. This invention considers the seismic wave propagation effect in layered soils, reduces spurious oscillations caused by the transformation of static and dynamic boundaries, and improves simulation accuracy and efficiency. It is suitable for seismic design and analysis of transportation infrastructure in soft soil areas.

The invention relates to the technical field of roadbed engineering monitoring, in particular to a roadbed engineering settlement deformation monitoring device and method, and the device comprises an optical fiber sensor network, a data collection module, a signal processing module, a model matching module, a frequency analysis module, a data fusion module, an early warning trigger module and a prediction report module. The optical fiber sensor network is deployed in a roadbed to collect an optical signal delay sequence, fluctuation characteristics are extracted through data collection and signal processing, settlement acceleration risks are judged through model matching, the speed trend is determined through frequency analysis, historical and real-time data are integrated through data fusion, an alarm is triggered when an early warning module exceeds a threshold value, and a risk assessment report is generated through a prediction module. According to the device, roadbed three-dimensional global monitoring and full-process automation are achieved, monitoring blind areas are eliminated, early warning lag is shortened, and accurate support is provided for roadbed stability operation and maintenance.

According to the high-speed railway subgrade settlement distributed monitoring method and system, the high-speed railway subgrade settlement distributed monitoring method has the advantages that the technology is mature, the precision is high (millimeter level), layered settlement of different soil layers can be measured, data are visual and reliable, and the precision is extremely high (can reach 0.1 mm level); the optical fiber is a sensor and a transmission medium and can continuously sense deformation of any point along an optical fiber path, the spatial resolution can reach the meter level or even the centimeter level, the anti-interference performance is high, the corrosion resistance and the electromagnetic interference resistance are achieved, the long-term stability is good, and the real distribution is achieved; the method is suitable for long-term monitoring, can realize multi-parameter monitoring (combining with different demodulation technologies and simultaneously monitoring settlement, strain, temperature and the like), and the monitoring system has full-time-domain continuity: 7 * 24-hour uninterrupted monitoring, which is far better than the frequency and full-space distribution of traditional manual inspection.

The present application relates to a kind of rural road pavement widening construction methods in rainy area, including the following steps, the material component, density and moisture content of widening section subgrade should be same with the material component, density and moisture content of old roadbed same level layer, the side middle part of old road cement concrete layer is drilled and planted with reinforcement with interval distance, adjacent planted reinforcement interval is 40-50cm, then a layer of SBS anti-cracking paste is uniformly arranged along joint;1-1.5cm thick rubber stress absorbing layer is spread on the upper end surface of new and old road cement concrete layer;With new asphalt, regenerating agent material, graded RAP material, aggregate and mineral powder are mixed in hot state, then asphalt concrete surface layer is paved on the upper end of rubber stress absorbing layer, and the thickness is 5-8cm.The present application prevents water damage caused by rain, delays damage at joint, reduces the probability of crack occurrence, and improves the service performance and durability of pavement.

The utility model belongs to municipal engineering technical field, concretely relates to a kind of shallow soft soil subgrade treatment combination structure in narrow site, comprising: replacement boundary line, roadbed replacement base layer, replacement demarcation line, ground line, excavation replacement slope line, cement soil mixing pile solid pile, cement soil mixing pile empty pile, cement solidification area and replacement granular material.Excavation replacement slope line starts from replacement demarcation line, and ends in replacement boundary line;Cement soil mixing pile solid pile is located below the area inside replacement boundary line road, its pile bottom is below replacement demarcation line, and pile top is cut off in excavation replacement slope line;Cement soil mixing pile empty pile is only as the "virtual section" that cement soil mixing pile solid pile body extends upwards;Cement solidification area is the area that replacement boundary line, cement soil mixing pile solid pile bottom and excavation replacement slope line, ground line are enclosed to form.The utility model can reduce the range of slope excavation, reduce the influence of excavation replacement subgrade treatment to surrounding environment and building structures.

A method for constructing a dynamic model of a coupled system of high-speed railway train-track-substructure includes: experimentally obtaining key technical parameters with nonlinear and frequency-varying characteristics in the high-speed railway infrastructure system; constructing a novel wheel-rail contact model suitable for higher speed levels and integrating it into the vehicle-track coupled dynamic model; constructing a train vehicle model and track structure model based on the principles of multi-rigid-body dynamics and the finite element method; and using a self-developed program to realize the dynamic modeling of the train-track system; taking the ballastless track structure, subgrade, bridge, and tunnel structures of high-speed railways as research objects, and applying a finite element simulation platform to realize the construction of a refined finite element model of the track-substructure structure; this invention achieves a breakthrough in the theoretical modeling of the vehicle-track-substructure system of higher speed railways, providing a research method and platform for deepening the understanding of the coupled dynamic mechanism of complex systems of high-speed railway infrastructure with speeds of 400 km / h and above.

The application discloses a kind of deep melting interlayer development area rigid pile composite foundation structure design method, it is related to rigid pile composite foundation field, including the following steps: step one, in the existing rigid pile bearing capacity calculation process, front-end increase subgrade-ground temperature field analysis;Step two, increase groundwater analysis;Step three, determine the compression modulus of the soil layer of seasonal freeze-thaw layer, (water-rich) melting interlayer, permafrost layer, bearing capacity characteristic value, check the single pile bearing capacity characteristic value of different positions in the cross section of roadbed using different pile length, pile diameter, pile body stiffness material;Step four, carry out zoned unequal design, adjust pile length, pile diameter, pile body stiffness, so that the range of all pile single pile bearing capacity characteristic values in cross section is lower than design allowable value.The application effectively optimizes pile foundation design, reduces material waste, reduces engineering cost, while ensuring the safety and stability of structure.

The present application relates to a kind of railway widening roadbed through active fault method and system, belong to traffic engineering technical field, the method utilizes active fault rotation direction, average annual horizontal sliding rate and its included angle with the direction of railway line as parameter, calculates the displacement amount along the vertical line direction within the design annual use limit of railway, multiplied by design safety factor, obtains roadbed design widening value.The present application provides control basis for the determination of roadbed widening value when railway passes through active fault zone in the form of roadbed, guarantees the economy and safety of railway operation.

This invention provides a roadbed camber stress measuring device and method, relating to the field of roadbed camber stress measurement technology. It includes a base positioning component with two expansion limiting components installed at its bottom; these two expansion limiting components are used for hole enlargement; a firm verification component is installed inside the base positioning component; the firm verification component is used for elastically pushing the base positioning component; a measurement guide component is installed at the top of the base positioning component; a measurement compensation component is installed on the measurement guide component; the measurement compensation component is used to compensate for roadbed settlement. The measurement compensation component can be used to compensate for roadbed settlement. Because roadbed soil with strong rheological properties may settle first and then camber, if the roadbed settles first, the height of the settlement will cause a lack of camber monitoring, affecting the comprehensiveness of data monitoring. This invention solves the problem that current roadbed camber stress measuring devices are difficult to achieve firm monitoring of the anchoring end and are not convenient for automatically compensating for roadbed settlement.

The application discloses a kind of based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, belong to road engineering anti-seepage reinforcement technical field, including bottom coarse-grained anti-seepage layer, top fine-grained anti-seepage layer, slope anti-seepage layer, after mixing coarse-grained bentonite-based mineral gel particles with bottom coarse-grained soil particles, water curing, paving compaction forms bottom coarse-grained anti-seepage layer, after compaction, continue to fill in the slope anti-seepage layer near the slope of subgrade, layer by layer, finally, after mixing fine-grained bentonite-based mineral gel particles with top fine-grained soil particles, water curing, paving compaction forms top fine-grained anti-seepage layer.The application has the advantages of significant anti-seepage effect, strong freeze-thaw resistance and strong environmental adaptability using the above-mentioned based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, effectively hinders groundwater rise, rain and snow water infiltration and slope seepage reinforcement effect, avoids cracking and collapse of subgrade in permafrost region during operation.

The invention provides a construction method of a prefabricated assembled roadbed structure of a new and old expressway, which comprises the following steps: S1, carrying out stepped excavation on an old roadbed splicing area, and connecting a plurality of first splicing units with an old roadbed through a longitudinal insertion structure; s2, the first splicing units and the second splicing units are connected through first bolt connecting sets, and the second splicing units are connected through transverse inserting structures; s3, the adjacent first splicing units and the connected second splicing units are connected through second bolt connecting sets; s4, the first splicing unit and the second splicing unit are each connected with a leveling assembly used for adjusting the elevation and levelness of the first splicing unit and the second splicing unit; s5, sealing pieces are arranged between the first splicing units, between the first splicing units and the second splicing units and between the second splicing units; and S6, cast-in-place structures are arranged at the joints of all the splicing structures, the site cast-in-place workload is reduced, and rapid splicing of the new roadbed and the old roadbed is achieved.

The present application relates to high-speed railway subgrade construction quality detection technical field, disclose a kind of railway subgrade filler grading identification method and system based on airborne unmanned vision perception, comprising: through the image of filler field collected by airborne unmanned aerial vehicle, carry out gray conversion, size reduction etc. in turn pretreatment;Adopt Otsu's method to carry out self-adapting binaryzation, exert morphological open operation, erosion, the sequence operation of inflation, to accurately segment and optimize filler particle profile;Profile is extracted using Canny algorithm, with the long diagonal line of particle circumscribed rectangle as equivalent particle diameter;Introduce shape correction factor to correct the error of sphere volume hypothesis, calculate particle mass based on the preset filler density-particle size relationship model;Finally, statistical generation grading curve.The present application realizes the automatic, fast, non-contact identification of railway subgrade filler grading, improves detection efficiency and accuracy, and provides technical support for intelligent quality control of subgrade construction.

The application discloses an isolation structure and method for reducing displacement of a railway pile foundation caused by shield construction, and the isolation structure comprises underpinning beams and 2N columns of inclined piles, and N is greater than or equal to 2; the underpinning beams are located below an existing railway subgrade; each column of inclined piles comprises a plurality of inclined piles with the same inclination direction and inclination angle; the 2N columns of inclined piles are divided into two groups; the pile bottoms of one group of the inclined piles are located on one side of a to-be-constructed shield tunnel, and the pile bottoms of the other group of the inclined piles are located on the other side of the to-be-constructed shield tunnel; two adjacent columns of inclined piles in the same group are arranged in an X-shaped cross mode; the pile tops of the two groups of the inclined piles are connected with the underpinning beams and form a portal type support structure; the to-be-constructed shield tunnel passes through the portal frame surrounded by the inclined piles and the underpinning beams; and the two groups of the inclined piles are located between original railway pile foundations and the to-be-constructed shield tunnel. The application can resist the horizontal deformation of the original railway pile foundations caused by the shield tunnel construction, reduce the settlement of the railway subgrade, and effectively protect the normal operation of the railway.

The application provides a high-mixing amount of construction waste runway structure suitable for a high-water-content silt ground, and can be applied to runways of different grades. The high-mixing amount of construction waste runway structure is located on the high-water-content silt ground and sequentially comprises, from bottom to top, a modified subgrade, a granular cushion, a water-stable lower base layer, a water-stable upper base layer, a composite seal layer and a cement concrete surface layer. Except for the composite seal layer, the materials of the structure layers all contain full replacement or high-mixing amount of construction waste recycled materials; the material types can include brick-concrete type construction waste and cement concrete type construction waste; and according to different structure layer positions, different particle size gradations and particle sizes are used. The airport runway surface structure provided by the application uses construction waste materials to replace natural stone materials such as mountain stone and limestone gravel, and meets the technical requirements of each layer of the runway surface through modification and other treatment methods, which has positive significance for saving natural materials, efficiently recycling solid waste and reducing the construction cost of the runway.

The application belongs to the field of cold region track engineering and subgrade engineering, and specifically discloses a high-speed rail ballastless track-subgrade freezing characteristic simulation test device based on meteorological conditions in cold regions, which comprises a programmable high-low temperature test box for controlling the alternating change of environmental temperature, a rainfall simulation device for adjusting according to different rainfall in cold regions, a solar radiation simulation device for adjusting according to different illumination in cold regions, a ballastless track structure composed of unit block type structure, a subgrade structure composed of three-layer structure, and a data acquisition and monitoring module for monitoring and collecting deformation displacement, temperature, moisture and radiation data in real time. Through the device, real-time monitoring of relevant parameters such as the temperature of the high-speed rail ballastless track, deformation, the temperature of the subgrade, moisture and deformation in cold regions can be realized, the freezing depth of the subgrade and the contribution of each soil layer in frost heaving deformation can be determined, and the influence of the ballastless track on the freezing characteristics of the subgrade can be further analyzed.

The invention provides tamping equipment for road subgrade construction. The tamping equipment comprises a frame body, a shell, a vibration driving mechanism and multiple stages of staggered hammer heads, the frame body is of a lower opening structure. The shell is connected into the frame body in a guiding and sliding mode, and the shell is a structure with a lower opening. The vibration driving mechanism is fixedly installed in the frame body and used for driving the shell to move up and down in a reciprocating mode on the frame body. The multi-stage staggered hammer head is arranged in the shell and comprises a plurality of multi-stage adjusting pieces, and the multiple multi-stage adjusting pieces are arranged at intervals in the left-right direction; the multi-stage adjusting piece comprises a hydraulic buffering mechanism and a double-rod dislocation piece, the hydraulic buffering mechanism is fixedly installed on the top wall of the shell, and the double-rod dislocation piece is fixedly installed on the hydraulic buffering mechanism. According to the tamping equipment for road subgrade construction, self-adaption can be conducted on the terrain through the multi-stage dislocation hammer head, so that the compaction degree of the ground tends to be consistent; and therefore, multidirectional buffering is carried out in the tamping process through dislocation movement of the tamping rods and buffering of the hydraulic buffering mechanism, and the overall structure is protected.

The utility model relates to the technical field of vibration tests, and particularly discloses an aeolian sand roadbed vibration wave excitation test device which comprises an excitation mechanism, a clamping mechanism and a data acquisition mechanism. The vibration excitation mechanism comprises a signal generator, a power amplifier and a vibration exciter; the clamping mechanism comprises a clamping plate, a bolt and a transverse plate. The data acquisition mechanism comprises an acceleration sensor, a dynamic data acquisition unit and a data processor. Through the arranged excitation mechanism, the excitation state of a train at different speeds and under different load conditions can be effectively simulated by adjusting the output frequency and excitation force, the damage condition of the aeolian sand improved soil under different excitation conditions can be accurately obtained, and the damage condition of the aeolian sand improved soil under different excitation conditions can be accurately detected through the arranged data collector. The dynamic response characteristics of the cement modified aeolian sand sample under the excitation condition can be effectively obtained, so that the internal change of the cement modified aeolian sand sample is judged.

This invention discloses a subgrade design method for ballastless track in expansive rock cuttings based on energy dissipation piles. The subgrade includes rigid piles, flexible rubber rings, and an expansive rock foundation. The steps are as follows: obtaining the foundation parameters of the expansive rock foundation; calculating the extrusion deformation of the flexible rubber rings under the lateral energy dissipation effect of the piles; calculating the vertical expansion force of the expansive rock foundation; calculating the shear force on the rigid-flexible energy dissipation piles and the upward thrust of the vertical expansion of the rock strata on the assembly groove within the atmospheric influence depth range; calculating the upward pull force on the rigid-flexible energy dissipation piles within the atmospheric influence depth range; calculating the pull-out force of the rigid-flexible energy dissipation piles below the atmospheric influence depth range; constructing a pull-out stability verification based on the pull-out force and pull-out force; determining the pile length of the rigid-flexible energy dissipation piles and the reinforcement of the rigid piles based on the pull-out stability verification and the tensile strength model of the pile body; the rigid-flexible energy dissipation pile structure designed based on the above parameters has both lateral energy dissipation and pull-out synergistic effects, which can effectively control the arching deformation problem of the expansive rock cutting.

The invention discloses a multi-stage reinforcing construction method for a granite stratum high-filling roadbed, and belongs to the technical field of roadbed construction in road engineering. The method aims at solving the problems that the granite stratum and roadbed filler interface bonding is weak, water drainage in the high-fill body is not smooth, and stability control in the construction process is difficult. The method comprises the following steps: scabbling the surface of the granite foundation, and laying a cement bentonite slurry transition layer to enhance interface bonding; a vertical drainage system is arranged after the first layer of filler is laid; then layered filling and reinforcing are conducted, geogrids are laid on each layer, door-shaped anchor rods are used for anchoring, then a water-permeable gravel layer is covered, and circulation is conducted till the designed elevation is reached; meanwhile, monitoring points are arranged on the center line and the slope toe of the roadbed, and construction parameters such as filling pause, reinforcement layer addition or compaction process adjustment are dynamically adjusted according to horizontal displacement data. The method is mainly used for building the high-fill roadbed on the granite stratum, and the overall stability and construction safety controllability of the roadbed can be effectively improved.

This application provides a modified Duncan-Chang model and its determination method that considers gradation and internal erosion. The determination method includes: S2, introducing a modified erosion degree; S3, constructing a shear-dominated linear elastic-non-correlated elastoplastic framework based on the traditional Duncan-Chang model, and explicitly setting key mechanical parameters as functions of , thus obtaining the modified Duncan-Chang model considering gradation and internal erosion. The modified Duncan-Chang model of this application, by introducing a modified erosion degree, solves the problem of traditional models neglecting gradation differences. Its prediction errors for the elastic stiffness and peak strength of eroded clay gravel are far superior to existing models, and it can be directly used for stability assessment of eroded clay gravel subgrade engineering, providing a theoretical basis for engineering reinforcement scheme formulation and reducing the risk of erosion disasters.