A cement high-pressure jet grouting pile control method, system and device

Abstract

This invention relates to the field of control and regulation technology, specifically to a control method, system, and device for high-pressure jet grouting piles. It obtains the real-time and instantaneous pressure variation amplitudes at a target time by using depth and pressure change time series from different earth pressure sensors; it then obtains the pressure variation amplitude based on these amplitudes; it obtains an objective influence coefficient by combining the horizontal displacement of the soil at the target time with the soil hardness at the target depth; it obtains a lifting speed adjustment coefficient based on the pressure variation amplitude and the objective influence coefficient; it obtains the lifting speed for the next time moment based on the adjustment coefficient and a preset initial lifting speed; and it obtains and adjusts the actual lifting speed for the next time moment based on the lifting speed for the next time moment and a preset speed range for different depths. This further reduces the impact on the stability of the surrounding soil and ensures the normal operation of the high-pressure jet grouting pile.

Description

Technical Field

[0001] The invention relates to the field of control and regulation technology, and in particular to a cement high-pressure rotary jetting pile control method, system and device. Background Art

[0002] High-pressure jet grouting piles use high-pressure rotating nozzles to spray cement slurry into the soil layer and mix it with the soil to form a continuous overlapping cement reinforcement body. Its construction occupies a small area, has low vibration and low noise. It is suitable for treating foundations such as silt, silty soil, fluid plastic, soft plastic or plastic clay, silt, sand, loess and gravel soil. High-pressure jet grouting is a very effective soil reinforcement method. It uses high-pressure spraying of cement slurry to naturally return the slurry through the construction opening, so that the cement and soil are fully mixed to form a cement soil reinforcement body with a certain strength. Due to the complex structure of the underground soil, if the lifting speed of the cement jet is too fast, the cement filling is not saturated, and it is difficult to reinforce the soil layer; if the lifting speed is too slow or the surrounding soil is too hard, the cement filling is excessive or difficult to spread, and it may even cause the nearby ground to bulge, destroying the ground buildings and causing harm.

[0003] At present, before the construction of cement high-pressure rotary jet piles, the site profile terrain will be detected, and the lifting speed of the cement rotary jet during the construction of the cement high-pressure rotary jet piles will be determined according to the actual classification of the deep geology. However, only the lifting speed range of the cement rotary jet can be determined based on the geology. Due to the complex underground structure, construction based only on the speed range is difficult to reduce the impact on the stability of the surrounding soil and cannot ensure the normal operation of the high-pressure rotary jet piles. Summary of the invention

[0004] In order to solve the above technical problems that it is difficult to reduce the influence on the stability of the surrounding soil and cannot ensure the normal operation of high-pressure rotary grouting piles when the lifting speed range of cement rotary grouting is determined according to geology, the purpose of the present invention is to provide a control method, system and device for cement high-pressure rotary grouting piles, and the technical scheme adopted is as follows:

[0005] A cement high-pressure jet grouting pile control device, the device comprising:

[0006] A data acquisition module is used to collect the depth of cement jet grouting during the lifting process, the soil hardness corresponding to the jet grouting depth, the time series of soil horizontal displacement changes, and the depth of at least two soil pressure sensors and the corresponding time series of pressure changes;

[0007] A data feature analysis module is used to obtain the pressure correlation coefficients of different soil pressure sensors at the target moment according to the depths of different soil pressure sensors and the jet grouting depth at the target moment; obtain the real-time pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients, the pressure values ​​at the initial moment and the corresponding pressure values ​​at the previous moment; obtain the instantaneous pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients and the corresponding pressure values ​​at the previous moment; obtain the pressure change amplitude at the target moment according to the real-time pressure change amplitude at the target moment and the first preset weight factor, the instantaneous pressure change amplitude and the second preset weight factor; obtain the objective influence coefficient at the target moment according to the soil hardness at the corresponding depth at the target moment, the horizontal displacement of the soil body and the horizontal displacement of the soil body at the corresponding previous moment;

[0008] The intelligent adjustment module is used to obtain the lifting speed adjustment coefficient at the target moment according to the pressure change amplitude at the target moment and the third preset weight factor, the objective influence coefficient and the fourth preset weight factor, adjust the preset initial lifting speed according to the lifting speed adjustment coefficient at the target moment, obtain the lifting speed at the next moment, and obtain the actual lifting speed at the next moment according to the preset speed range at different depths and the lifting speed at the next moment and adjust it.

[0009] Furthermore, the step of obtaining the pressure correlation coefficient includes:

[0010] Calculate the absolute value of the difference between the depth of the target soil pressure sensor and the rotary jet depth at the target moment as the target depth difference, calculate the sum of the absolute values ​​of the differences between the depths of all soil pressure sensors and the rotary jet depth at the target moment as the sum of depth differences; calculate the ratio of the target depth difference to the sum of depth differences; obtain the pressure correlation coefficient of the target soil pressure sensor at the target moment based on the difference between the first preset constant and the ratio of the target depth difference to the sum of depth differences.

[0011] Furthermore, the step of acquiring the real-time pressure change amplitude includes:

[0012] The absolute value of the difference between the pressure value of the target earth pressure sensor at the target moment and the pressure value at the previous moment of the target moment is calculated as the target pressure difference, and the ratio of the target pressure difference to the pressure value of the target earth pressure sensor at the initial moment is calculated. The real-time pressure change amplitude component of the target earth pressure sensor at the target moment is obtained according to the product of the ratio of the target pressure difference to the pressure value of the target earth pressure sensor at the initial moment and the pressure correlation coefficient of the target earth pressure sensor at the target moment. The sum of the real-time pressure change amplitude components of all earth pressure sensors at the target moment is calculated to obtain the real-time pressure change amplitude at the target moment.

[0013] Furthermore, the step of obtaining the instantaneous pressure change amplitude includes:

[0014] The absolute value of the difference between the pressure value of the target earth pressure sensor at the target moment and the pressure value at the moment before the target moment is calculated as the target pressure difference, and the average value of the absolute value of the difference between the pressure value of the target earth pressure sensor at all historical moments before the target moment and the corresponding previous moment is calculated as the target historical pressure difference; the product of the ratio of the target pressure difference of the target earth pressure sensor to the target historical pressure difference and the pressure correlation coefficient of the target earth pressure sensor at the target moment is calculated to obtain the pressure instantaneous change amplitude component of the target earth pressure sensor at the target moment; the sum of the pressure instantaneous change amplitude components of all earth pressure sensors at the target moment is calculated to obtain the pressure instantaneous change amplitude at the target moment.

[0015] Furthermore, the step of obtaining the pressure variation amplitude includes:

[0016] The pressure change amplitude at the target moment is obtained by multiplying the product of the real-time pressure change amplitude at the target moment and the first preset weight factor by the product of the instantaneous pressure change amplitude and the second preset weight factor.

[0017] Furthermore, the step of obtaining the objective influence coefficient includes:

[0018] According to the soil hardness at different depths, the normalized soil hardness value is obtained by the maximum and minimum normalization method, the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment is calculated, and the sum of the normalized soil hardness value at the depth corresponding to the target moment and the second preset constant is calculated; an exponential function value with the natural constant as the base and the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment as the exponent is calculated; the objective influence coefficient at the target moment is obtained according to the product of the sum of the normalized soil hardness value at the depth corresponding to the target moment and the second preset constant and the exponential function value.

[0019] Furthermore, the step of obtaining the lifting speed adjustment coefficient includes:

[0020] The product of the pressure change amplitude at the target moment and the third preset weight factor is multiplied by the product of the objective influence coefficient and the fourth preset weight factor and normalized to obtain the lifting speed adjustment coefficient at the corresponding moment.

[0021] Furthermore, the step of obtaining the lifting speed at the next moment includes:

[0022] The sum of the current lifting speed adjustment coefficient and the third preset constant is calculated, and the lifting speed at the next moment is obtained according to the product of the sum of the current lifting speed adjustment coefficient and the third preset constant and the preset initial lifting speed.

[0023] Furthermore, the step of obtaining the actual lifting speed includes:

[0024] A range of lifting speeds is preset for different depth stages. When the lifting speed at the next moment obtained in the corresponding depth stage is within the preset lifting speed range of the corresponding depth, the actual lifting speed is the lifting speed at the next moment; when the lifting speed at the next moment obtained in the corresponding depth stage is less than or equal to the preset minimum lifting speed of the corresponding depth, the actual lifting speed is the preset minimum lifting speed; when the lifting speed at the next moment obtained in the corresponding depth stage is greater than or equal to the preset maximum lifting speed of the corresponding depth, the actual lifting speed is the preset maximum lifting speed.

[0025] The present invention also proposes a cement high-pressure rotary jetting pile control method, which utilizes the cement high-pressure rotary jetting pile control device to control the cement high-pressure rotary jetting pile.

[0026] The present invention also proposes a cement high-pressure rotary jet grouting pile control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the cement high-pressure rotary jet grouting pile control method are implemented.

[0027] The present invention has the following beneficial effects:

[0028] In the embodiment of the present invention, the pressure correlation coefficients of different soil pressure sensors at the target moment are obtained, and the purpose is that cement rotary spraying has different pressure effects on different positions at different target moments. The pressure correlation coefficients are calculated in order to determine the degree of influence of different soil pressure sensors and improve the accuracy of pressure change amplitude data; the real-time pressure change amplitude at the target moment is obtained, and the purpose is to compare the pressure change of the soil pressure sensor at the target moment with the pressure before rotary spraying, so as to analyze the influence of the rotary spraying process at the target moment on the surrounding soil; the instantaneous pressure change amplitude at the target moment is obtained, and the purpose is to compare the pressure change at the target moment with the historical pressure change, so as to analyze the influence of the rotary spraying process at the target moment on the surrounding soil; the pressure change amplitude at the target moment is obtained, and the purpose is to analyze the influence of the rotary spraying process at the target moment on the surrounding soil according to the combination of the real-time pressure change amplitude and the instantaneous pressure change amplitude. Compared with the analysis of a single factor, the credibility of the results is improved and the accuracy of the final results is increased; the objective influence coefficient of the target moment is obtained, the purpose is that the deep soil structure is complex and the conditions at different depths are different, and it is necessary to increase the analysis of the influencing factors of the lifting speed adjustment, which further improves the accuracy of the final lifting speed adjustment; the lifting speed adjustment coefficient of the target moment is obtained, the purpose is to determine the lifting speed at the next moment according to the surrounding conditions of the cement rotary spraying at the most recent moment, and ensure the reliability and accuracy of the lifting speed at the next moment; the actual lifting speed at the next moment is obtained and adjusted, the purpose is that the lifting speed at the next moment is a theoretical value, which cannot be completely guaranteed to be accurate, and it needs to be determined in combination with the preset lifting speed range of different depths obtained by exploration before construction, which further ensures the accuracy and reliability of the final result, thereby reducing the impact of the cement rotary spraying on the stability of the surrounding soil and ensuring the normal operation of the high-pressure rotary spraying piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A block diagram of a cement high-pressure rotary jet grouting pile control device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a cement high-pressure rotary jet pile control method, system and device proposed according to the present invention, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0032] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0033] The specific scheme of the cement high-pressure rotary jet grouting pile control method, system and device provided by the present invention is described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 , which shows a block diagram of a cement high-pressure rotary jet pile control device provided by an embodiment of the present invention, the device includes: a data acquisition module, a data feature analysis module, and an intelligent adjustment module.

[0035] The data acquisition module S1 is used to collect the cement jet grouting depth during the lifting process, the soil hardness corresponding to the jet grouting depth, the soil horizontal displacement change time series, and the depth of at least two soil pressure sensors and the corresponding pressure change time series.

[0036] Before the construction of high-pressure rotary jet grouting piles, the site profile terrain will be surveyed, and the preset initial lifting speed of the cement rotary jet and the preset speed range for different depths will be determined according to the actual geological conditions at different depths. However, in the actual construction process, the geological conditions are more complicated, and it is difficult to achieve the best effect by only performing cement rotary jet grouting according to the preset lifting speed range for different depths. Even within the preset lifting speed range, if the lifting speed is too fast, the cement filling will not be saturated, making it difficult to reinforce the soil layer. If the lifting speed is too slow, the cement filling will be excessive, which may even cause the nearby ground to bulge, damaging the ground buildings and causing harm.

[0037] Therefore, in order to ensure the construction quality of cement rotary spraying and not affect the ground construction, it is necessary to more accurately control the lifting speed during cement rotary spraying. In an embodiment of the present invention, it is first necessary to determine the rotary spraying depth at different times during the cement rotary spraying process. The rotary spraying depth can be directly read according to the control system of the high-pressure rotary spraying pile, and the specific method steps are not repeated. During the cement rotary spraying process, the displacement of the soil body may be caused; and the degree of displacement of soil bodies of different hardness after being subjected to the same pressure is different. First, the soil hardness at each depth near the rotary spraying pile is determined before construction. It should be noted that the method for obtaining the soil hardness belongs to the public technology and is not repeated. A deep soil horizontal displacement monitoring device is installed near the rotary spraying pile, which can monitor the horizontal displacement of the soil body, collect the overall soil horizontal displacement value at each target moment, and obtain the soil horizontal displacement change time series during the cement rotary spraying process. The target moment refers to different time points during the cement rotary spraying process. The time interval between any two connected target moment nodes is the same, and different target moments also mean different rotary spraying depths. It should be noted that the installation position of the deep soil horizontal displacement monitoring device is determined by the implementer according to the implementation scenario.

[0038] Furthermore, during the cement jetting process, due to the continuous high-pressure injection of cement, the nearby soil is squeezed by cement, and the soil pressure will change. If the lifting speed is slow and the amount of cement injection is large, the pressure on the nearby soil will increase; if the lifting speed is fast and the amount of cement injection is small, the pressure change of the nearby soil is not obvious. Therefore, the lifting speed can be adjusted according to the change of soil pressure around the cement jetting, and multiple soil pressure sensors are installed in the same vertical direction parallel to the jetting pile position and the depth of each soil pressure sensor is obtained, and the pressure change time series of each soil pressure sensor is collected. It should be noted that the distance between the soil pressure sensor and the jetting pile position in the same vertical direction can be determined by the implementer according to the implementation scenario; the number of soil pressure sensors can be determined by the implementer according to the depth of the jetting pile. The purpose of placing multiple soil pressure sensors is that the cement jetting is a lifting process. The pressure values ​​of the soil pressure sensors at different times and positions are different, and it is necessary to use multiple soil pressure sensors to jointly analyze the degree of adjustment of the lifting speed.

[0039] At this point, in order to more accurately control the lifting speed of cement rotary spraying, the rotary spraying depth of cement rotary spraying and the soil hardness corresponding to the rotary spraying depth, the time series of soil horizontal displacement changes, the depth of different soil pressure sensors and the corresponding time series of pressure changes were collected during the lifting process of cement rotary spraying, and further analysis was performed through the collected information.

[0040] The data feature analysis module S2 is used to obtain the pressure correlation coefficients of different soil pressure sensors at the target moment according to the depths of different soil pressure sensors and the rotary jetting depth at the target moment; obtain the real-time pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients, the pressure values ​​at the initial moment and the pressure values ​​at the corresponding previous moment; obtain the instantaneous pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients and the pressure values ​​at the corresponding previous moment; obtain the pressure change amplitude at the target moment according to the real-time pressure change amplitude at the target moment and the first preset weight factor, the instantaneous pressure change amplitude and the second preset weight factor; obtain the objective influence coefficient at the target moment according to the soil hardness at the corresponding depth at the target moment, the horizontal displacement of the soil body and the horizontal displacement of the soil body at the corresponding previous moment.

[0041] The control and adjustment of the cement jet grouting lifting speed can be analyzed based on the pressure changes of different soil pressure sensors. The principle is that when the high-pressure jet grouting pile is working, the nozzle of the high-pressure jet grouting pile sprays cement slurry into the soil layer and mixes it with the soil. The soil layer on the side is squeezed by the soil mixed with cement slurry, and the force on the soil on the side increases. Under normal lifting speed, the force on the soil on the side gradually increases with the increase of cement, which means that the pressure value of the soil pressure sensor at the target moment is relatively stable and normal compared with the pressure value at the previous moment, and the amplitude is small. When the lifting speed is slow or the soil nearby is hard, the cement slurry cannot be continuously diffused and discharged, and it is concentrated near the nozzle, which will cause the pressure on the side of the soil to increase by a large amplitude, which means that the pressure value of the soil pressure sensor at the target moment is relatively abnormal compared with the pressure value at the previous moment, and the amplitude is large. Therefore, in the case of an increase in the amplitude of the pressure value change, it is necessary to increase the lifting speed of the cement jet grouting, thereby reducing the surrounding pressure changes, reducing the impact on the stability of the surrounding soil, and ensuring the construction quality.

[0042] First, because there are multiple soil pressure sensors in the same vertical direction, the distance between each soil pressure sensor and the depth of the cement jet spraying at the target time is different during the cement jet spraying process. The closer the soil pressure sensor is to the nozzle, the more obvious the pressure change is, that is, the pressure change of this soil pressure sensor is more related to the control and regulation of the lifting speed. Therefore, it is necessary to calculate the pressure correlation coefficient of different soil pressure sensors at the target time first, and only after determining the pressure correlation coefficient can the pressure change amplitude be analyzed. The specific calculation steps of the pressure correlation coefficient of the soil pressure sensor at the target time include:

[0043] Calculate the absolute value of the difference between the depth of the target soil pressure sensor and the jet grouting depth at the target time as the target depth difference, calculate the sum of the absolute values ​​of the difference between the depths of all soil pressure sensors and the jet grouting depth at the target time as the sum of the depth differences; calculate the ratio of the target depth difference to the sum of the depth differences; obtain the pressure correlation coefficient of the target soil pressure sensor at the target time according to the difference between the first preset constant and the ratio of the target depth difference to the sum of the depth differences. The specific formula for obtaining the pressure correlation coefficient includes:

[0044]

[0045] Where: is the pressure correlation coefficient of the i-th soil pressure sensor at the t-th moment during the cement grouting process, d i is the depth of the ith earth pressure sensor, h t is the jet grouting depth at the tth moment; |d i -h t | is the absolute value of the difference between the depth of the i-th soil pressure sensor and the rotary jet depth at the t-th moment, which is used as the target depth difference; g1 is a first preset constant, which should be noted that in the embodiment of the present invention, is 1, and the implementer can determine the size of the first preset constant according to the implementation scenario; a is the number of soil pressure sensors, and j is a different soil pressure sensor; The sum of the absolute values ​​of the differences between the depths of all soil pressure sensors and the rotary grouting depth at the tth moment is taken as the sum of the depth differences.

[0046] From the formula of the pressure correlation coefficient, it can be seen that the smaller the distance between the depth of the target soil pressure sensor and the jet grouting depth at the target moment, the greater the pressure correlation coefficient; the greater the distance between the depth of the target soil pressure sensor and the jet grouting depth at the target moment, the smaller the pressure correlation coefficient. When calculating the pressure change amplitude, the soil pressure sensor with a larger pressure correlation coefficient has a greater weight in terms of data share, because when the pressure change amplitude is abnormal, the change in the soil pressure sensor near the nozzle is the most obvious, and the pressure change in the soil pressure sensor farther away is relatively small. It should be noted that the pressure correlation coefficient of the same soil pressure sensor also changes with the change of the target moment, that is, the change of the jet grouting depth.

[0047] After obtaining the pressure correlation coefficients of different soil pressure sensors at different times, the real-time pressure change amplitude at the target moment can be obtained according to the pressure values ​​at the target moment, the pressure correlation coefficients, the initial moment pressure values ​​and the corresponding previous moment pressure values ​​of different soil pressure sensors. Specifically, it includes: calculating the absolute value of the difference between the pressure value of the target soil pressure sensor at the target moment and the pressure value at the previous moment of the target moment as the target pressure difference, calculating the ratio of the target pressure difference to the pressure value of the target soil pressure sensor at the initial moment, obtaining the real-time pressure change amplitude component of the target soil pressure sensor at the target moment according to the ratio of the target pressure difference to the pressure value of the target soil pressure sensor at the initial moment and the product of the pressure correlation coefficient of the target soil pressure sensor at the target moment, calculating the sum of the real-time pressure change amplitude components of all soil pressure sensors at the target moment, and obtaining the real-time pressure change amplitude at the target moment. The formula for obtaining the real-time pressure change amplitude specifically includes:

[0048]

[0049] In the formula, m t is the real-time pressure change amplitude at the t moment during the cement grouting process, is the pressure value of the i-th soil pressure sensor at the t-th moment, is the pressure value of the i-th soil pressure sensor at the t-1th moment, is the initial pressure value of the i-th soil pressure sensor; is the absolute value of the difference between the pressure values ​​of the i-th soil pressure sensor at time t and at time t-1, which is used as the target pressure difference; That is, the pressure real-time change amplitude component of the target soil pressure sensor at the target time. It should be noted that the pressure value at the initial time refers to the pressure value of the target soil pressure sensor before the cement rotary spraying starts.

[0050] According to the formula of real-time pressure change amplitude, when the pressure difference between the soil pressure sensor at the target moment and the previous moment is greater, the ratio of the pressure value at this moment to the initial moment is greater, that is, the real-time pressure change amplitude is greater, which means that the cement rotary spraying process is abnormal at this moment, which may affect the stability of the surrounding soil and the normal operation of the high-pressure rotary spraying pile. It is necessary to increase the lifting speed to reduce the real-time pressure change amplitude. The reason for comparing with the initial pressure value instead of the previous moment is to exclude the situation where the relative pressure change amplitude is diluted due to the increase of the corresponding pressure value at each moment as the rotary spraying time increases.

[0051] Furthermore, after obtaining the real-time pressure change amplitude, it is necessary to calculate the instantaneous pressure change amplitude and jointly analyze the cement rotary spraying process status. The instantaneous pressure change amplitude at the target moment is obtained according to the pressure value at the target moment, the pressure correlation coefficient and the corresponding pressure value at the previous moment of different soil pressure sensors, specifically including: calculating the absolute value of the difference between the pressure value of the target soil pressure sensor at the target moment and the pressure value at the previous moment of the target moment as the target pressure difference, calculating the average value of the absolute value of the difference between the pressure value of the target soil pressure sensor at all historical moments before the target moment and the corresponding pressure value at the previous moment as the target historical pressure difference; calculating the product of the ratio of the target pressure difference of the target soil pressure sensor and the target historical pressure difference and the pressure correlation coefficient of the target soil pressure sensor at the target moment, and obtaining the instantaneous pressure change amplitude component of the target soil pressure sensor at the target moment; calculating the sum of the instantaneous pressure change amplitude components of all soil pressure sensors at the target moment, and obtaining the instantaneous pressure change amplitude at the target moment. The specific formula for obtaining the instantaneous pressure change amplitude includes:

[0052]

[0053] Where n t is the instantaneous pressure change amplitude at the tth moment during the cement rotary grouting lifting process, k is the number of all historical moments before the target moment, and z represents the different historical moments before the target moment; The average value of the absolute value of the difference between the pressure value of the target soil pressure sensor at all historical moments before the target moment and the pressure value at the corresponding previous moment is taken as the target historical pressure difference; It is the instantaneous change amplitude component of the pressure of the target soil pressure sensor at the target time.

[0054] According to the formula for the instantaneous pressure change amplitude, when the pressure difference between the soil pressure sensor at the target moment and the corresponding previous moment is greater than the pressure difference at the previous historical moment, it means that the instantaneous pressure change amplitude of the cement rotary spraying at this target moment is greater, that is, the cement rotary spraying position is more likely to experience a sudden increase in the pressure change amplitude, and the more likely it is to affect the stability of the surrounding soil and the normal operation of the high-pressure rotary spraying piles. At this time, the lifting speed needs to be increased.

[0055] At this point, after obtaining the real-time pressure change amplitude and the instantaneous pressure change amplitude at the target moment, the pressure change amplitude at the target moment can be obtained according to the real-time pressure change amplitude at the target moment and the first preset weight factor, the instantaneous pressure change amplitude and the second preset weight factor. Specifically, it includes: multiplying the product of the real-time pressure change amplitude at the target moment and the first preset weight factor with the product of the instantaneous pressure change amplitude and the second preset weight factor to obtain the pressure change amplitude at the target moment. The formula for obtaining the pressure change amplitude includes:

[0056] e t=(w1*m t )*(w2*n t )

[0057] In the formula, e t is the pressure change amplitude at moment t during the cement rotary grouting lifting process, w1 is the first preset weight factor, w2 is the second preset weight factor, in the embodiment of the present invention, the first preset weight factor is 0.2, and the second preset weight factor is 0.8. The implementer can determine the first preset weight factor and the second preset weight factor according to the implementation scenario.

[0058] According to the formula for pressure change amplitude, the pressure change amplitude comprehensively measures the real-time pressure change amplitude and the instantaneous pressure change amplitude corresponding to the target moment. The purpose of adding the first preset weight factor and the second preset weight factor is to assign different influence weights. Compared with the analysis of a single aspect, the combination of the real-time pressure change amplitude and the instantaneous pressure change amplitude makes the pressure change amplitude obtained by the analysis more credible and the final result more accurate. When the pressure change amplitude at the target moment is larger, the pressure change amplitude may suddenly increase at the position of the cement rotary spraying, which is more likely to affect the stability of the surrounding soil and the normal operation of the high-pressure rotary spraying piles, and the lifting speed needs to be increased.

[0059] Furthermore, objective factors such as the soil hardness corresponding to different jet grouting depths and deep soil displacement also affect the lifting speed at different depths. Since cement high-pressure jet grouting piles are deep underground, different depths may correspond to different soil hardnesses. When the soil is hard, not much cement reinforcement is needed, and the lifting speed of cement jet grouting should be appropriately increased. When the pressure value obtained by the soil pressure sensor is large, the soil will inevitably shift. Therefore, it is also necessary to take into account the horizontal displacement of the soil collected by the deep soil horizontal displacement monitoring device. If the soil displacement is large, it may affect the ground buildings. Therefore, it is also necessary to consider the soil displacement data. When the soil displacement data is large, it is also necessary to increase the lifting speed.

[0060] Therefore, the objective influence coefficient at the target moment is obtained according to the soil hardness at the corresponding depth at the target moment, the horizontal displacement of the soil and the horizontal displacement of the soil at the corresponding previous moment. Specifically, it includes: obtaining the normalized soil hardness value through the maximum and minimum normalization method according to the soil hardness at different depths, calculating the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment, and calculating the sum of the normalized soil hardness value at the corresponding depth at the target moment and the second preset constant; calculating the exponential function value with the natural constant as the base and the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment as the exponent; obtaining the objective influence coefficient at the target moment according to the product of the sum of the normalized soil hardness value at the corresponding depth at the target moment and the second preset constant and the corresponding exponential function value. It should be noted that the maximum and minimum normalization method is a public technology, and the specific steps will not be repeated. The specific formula for obtaining the objective influence coefficient includes:

[0061] o t =(s t +g2)*exp(f t )

[0062] In the formula, o t is the objective influence coefficient at the tth moment in the cement grouting process, s t is the normalized value of the soil hardness at the jet grouting depth at time t, g2 is the second preset constant, the purpose is to prevent s t The value is 0, which leads to the situation where the objective influence coefficient is 0; exp() is an exponential function with a natural constant as the base, the purpose of which is to remove the dimension of the horizontal displacement value of the soil. t is the horizontal displacement of the entire soil at the tth moment.

[0063] It can be seen from the formula of the objective influence coefficient that the objective influence coefficient reflects the soil hardness and horizontal displacement of the soil at the rotary grouting depth corresponding to the target time of cement rotary grouting; the greater the soil hardness and the horizontal displacement of the soil, the greater the objective influence coefficient. At this time, in order to ensure a stable soil structure, the lifting speed needs to be increased.

[0064] At this point, the pressure variation amplitude and objective influence coefficient in the cement rotary spraying process are obtained. It is necessary to calculate the lifting speed adjustment coefficient based on the pressure variation amplitude and the objective influence coefficient, and then control and adjust the lifting speed.

[0065] Intelligent adjustment module S3 is used to obtain the lifting speed adjustment coefficient at the target moment according to the pressure change amplitude at the target moment and the third preset weight factor, the objective influence coefficient and the fourth preset weight factor, adjust the preset initial lifting speed according to the lifting speed adjustment coefficient at the target moment, obtain the lifting speed at the next moment, obtain the actual lifting speed at the next moment according to the preset speed range at different depths and the lifting speed at the next moment and adjust it.

[0066] First, the lifting speed adjustment coefficient at the target moment is obtained according to the pressure change amplitude at the target moment and the third preset weight factor, the objective influence coefficient and the fourth preset weight factor, specifically including: multiplying the product of the pressure change amplitude at the target moment and the third preset weight factor with the product of the objective influence coefficient and the fourth preset weight factor and normalizing them to obtain the lifting speed adjustment coefficient at the corresponding moment. The specific formula for obtaining the lifting speed adjustment coefficient includes:

[0067] l t =th(w3*e t +w4*o t )

[0068] In the formula, l t is the lifting speed adjustment coefficient at the tth moment in the cement rotary grouting lifting process, th( ) is the use of the hyperbolic tangent function to normalize the value in the brackets in direct proportion; w3 is the third preset weight factor, w4 is the fourth preset weight factor, the purpose is to give different influence weights to the pressure change amplitude and the objective influence coefficient. In the embodiment of the present invention, w3 is 0.6 and w4 is 0.4. The implementer can determine the value according to the implementation scenario.

[0069] It can be seen from the formula of the lifting speed adjustment coefficient that when the pressure change amplitude and the objective influence coefficient are larger, the lifting speed adjustment coefficient is larger, and the lifting speed should be increased more, so as to ensure the stability of the surrounding soil during the cement rotary spraying process and the normal operation of the high-pressure rotary spraying piles.

[0070] Further, after obtaining the lifting speed adjustment coefficient at the target moment, the lifting speed corresponding to the next moment can be calculated, specifically including: calculating the sum of the lifting speed adjustment coefficient at the current moment and the third preset constant, and obtaining the lifting speed at the next moment according to the product of the sum of the lifting speed adjustment coefficient at the current moment and the third preset constant and the preset initial lifting speed. The specific formula for obtaining the lifting speed at the next moment includes:

[0071] v t+1 =(g3+l t )*v0

[0072] In the formula, v t+1 is the lifting speed at the next moment after the tth moment in the cement rotary grouting lifting process, g3 is the third preset constant. In the embodiment of the present invention, the third preset constant is 1, and the implementer can determine the value according to the implementation scenario; v0 is the preset initial lifting speed, and the preset initial lifting speed is determined by the implementer before rotary grouting according to the implementation scenario.

[0073] According to the formula for the lifting speed at the next moment, its value is calculated based on the lifting speed adjustment coefficient obtained based on the overall impact of the target moment. Because the two moments are close and the soil structure is similar, the lifting speed at the next moment is more reliable and accurate. t+1 In order to calculate the theoretical value, the actual soil conditions at different depths may not allow a higher or lower lifting speed. Therefore, it is necessary to obtain the actual lifting speed at the next moment and adjust it according to the preset speed range at different depths and the lifting speed at the next moment. Among them, the preset speed range at different depths requires the soil at the rotary grouting position to be explored before construction, and the lifting speed range at different depths of the rotary grouting position is determined by the technicians. After obtaining the preset lifting speed range at different depth stages, when the lifting speed at the next moment obtained in the corresponding depth stage is within the preset lifting speed range of the corresponding depth, the actual lifting speed is the lifting speed at the next moment; when the lifting speed at the next moment obtained in the corresponding depth stage is less than or equal to the preset minimum lifting speed of the corresponding depth, the actual lifting speed is the preset minimum lifting speed; when the lifting speed at the next moment obtained in the corresponding depth stage is greater than or equal to the preset maximum lifting speed of the corresponding depth, the actual lifting speed is the preset maximum lifting speed. Finally, the intelligent adjustment system of the cement high-pressure rotary grouting pile adjusts the lifting speed according to the actual lifting speed at the next moment, reduces the impact on the stability of the surrounding soil and ensures the normal operation of the high-pressure rotary grouting pile.

[0074] To summarize, the embodiment of the present invention obtains the real-time pressure change amplitude and the instantaneous pressure change amplitude at the target moment through the depth and pressure change time series of different soil pressure sensors, and obtains the pressure change amplitude through the real-time pressure change amplitude and the instantaneous pressure change amplitude; obtains the objective influence coefficient through the horizontal displacement of the soil at the target moment and the soil hardness at the depth at the target moment; obtains the lifting speed adjustment coefficient according to the pressure change amplitude and the objective influence coefficient at the target moment; obtains the lifting speed at the next moment according to the lifting adjustment coefficient and the preset initial lifting speed, obtains the actual lifting speed at the next moment according to the lifting speed at the next moment and the preset speed range at different depths and adjusts it, so as to further reduce the influence on the stability of the surrounding soil and ensure the normal operation of the high-pressure rotary jet piles.

[0075] The invention also proposes a cement high-pressure rotary jetting pile control method, which utilizes a cement high-pressure rotary jetting pile control device to control the cement high-pressure rotary jetting pile.

[0076] The present invention also proposes a cement high-pressure rotary jet grouting pile control system, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of a cement high-pressure rotary jet grouting pile control method are implemented.

[0077] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0078] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A cement high-pressure jet grouting pile control device, characterized in that: The device includes: A data acquisition module is used to collect the depth of cement jet grouting during the lifting process, the soil hardness corresponding to the jet grouting depth, the time series of soil horizontal displacement changes, and the depth of at least two soil pressure sensors and the corresponding time series of pressure changes; A data feature analysis module is used to obtain the pressure correlation coefficients of different soil pressure sensors at the target moment according to the depths of different soil pressure sensors and the jet grouting depth at the target moment; obtain the real-time pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients, the pressure values ​​at the initial moment and the pressure values ​​at the corresponding previous moment; obtain the instantaneous pressure change amplitude at the target moment according to the pressure values ​​of different soil pressure sensors at the target moment, the pressure correlation coefficients and the pressure values ​​at the corresponding previous moment, as well as the pressure values ​​at the historical moment and the corresponding previous moment; obtain the pressure change amplitude at the target moment according to the real-time pressure change amplitude at the target moment and the first preset weight factor, the instantaneous pressure change amplitude and the second preset weight factor; obtain the objective influence coefficient at the target moment according to the soil hardness at the corresponding depth at the target moment, the horizontal displacement of the soil body and the horizontal displacement of the soil body at the corresponding previous moment; The intelligent adjustment module is used to obtain the lifting speed adjustment coefficient at the target moment according to the pressure change amplitude at the target moment and the third preset weight factor, the objective influence coefficient and the fourth preset weight factor, adjust the preset initial lifting speed according to the lifting speed adjustment coefficient at the target moment, obtain the lifting speed at the next moment, and obtain the actual lifting speed at the next moment according to the preset speed range at different depths and the lifting speed at the next moment and adjust it.

2. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the pressure correlation coefficient comprises: Calculate the absolute value of the difference between the depth of the target soil pressure sensor and the rotary jet depth at the target moment as the target depth difference, calculate the sum of the absolute values ​​of the differences between the depths of all soil pressure sensors and the rotary jet depth at the target moment as the sum of depth differences; calculate the ratio of the target depth difference to the sum of depth differences; obtain the pressure correlation coefficient of the target soil pressure sensor at the target moment based on the difference between the first preset constant and the ratio of the target depth difference to the sum of depth differences.

3. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the real-time pressure change amplitude comprises: The absolute value of the difference between the pressure value of the target earth pressure sensor at the target moment and the pressure value at the previous moment of the target moment is calculated as the target pressure difference, and the ratio of the target pressure difference to the pressure value of the target earth pressure sensor at the initial moment is calculated. The real-time pressure change amplitude component of the target earth pressure sensor at the target moment is obtained according to the product of the ratio of the target pressure difference to the pressure value of the target earth pressure sensor at the initial moment and the pressure correlation coefficient of the target earth pressure sensor at the target moment. The sum of the real-time pressure change amplitude components of all earth pressure sensors at the target moment is calculated to obtain the real-time pressure change amplitude at the target moment.

4. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the instantaneous pressure change amplitude comprises: The absolute value of the difference between the pressure value of the target earth pressure sensor at the target moment and the pressure value at the moment before the target moment is calculated as the target pressure difference, and the average value of the absolute value of the difference between the pressure value of the target earth pressure sensor at all historical moments before the target moment and the corresponding previous moment is calculated as the target historical pressure difference; the product of the ratio of the target pressure difference of the target earth pressure sensor to the target historical pressure difference and the pressure correlation coefficient of the target earth pressure sensor at the target moment is calculated to obtain the pressure instantaneous change amplitude component of the target earth pressure sensor at the target moment; the sum of the pressure instantaneous change amplitude components of all earth pressure sensors at the target moment is calculated to obtain the pressure instantaneous change amplitude at the target moment.

5. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the pressure variation amplitude comprises: The pressure change amplitude at the target moment is obtained by multiplying the product of the real-time pressure change amplitude at the target moment and the first preset weight factor by the product of the instantaneous pressure change amplitude and the second preset weight factor.

6. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the objective influence coefficient comprises: According to the soil hardness at different depths, the normalized soil hardness value is obtained by the maximum and minimum normalization method, the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment is calculated, and the sum of the normalized soil hardness value at the depth corresponding to the target moment and the second preset constant is calculated; an exponential function value with the natural constant as the base and the absolute value of the difference between the horizontal displacement of the soil at the target moment and the corresponding previous moment as the exponent is calculated; the objective influence coefficient at the target moment is obtained according to the product of the sum of the normalized soil hardness value at the depth corresponding to the target moment and the second preset constant and the exponential function value.

7. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the lifting speed adjustment coefficient includes: The product of the pressure change amplitude at the target moment and the third preset weight factor is multiplied by the product of the objective influence coefficient and the fourth preset weight factor and normalized to obtain the lifting speed adjustment coefficient at the corresponding moment.

8. A cement high pressure jet grouting pile control device according to claim 1, characterized in that: The step of obtaining the actual lifting speed comprises: Calculate the sum of the current lifting speed adjustment coefficient and the third preset constant, and obtain the lifting speed at the next moment according to the product of the sum of the current lifting speed adjustment coefficient and the third preset constant and the preset initial lifting speed; A range of lifting speeds is preset for different depth stages. When the lifting speed at the next moment obtained in the corresponding depth stage is within the preset lifting speed range of the corresponding depth, the actual lifting speed is the lifting speed at the next moment; when the lifting speed at the next moment obtained in the corresponding depth stage is less than or equal to the preset minimum lifting speed of the corresponding depth, the actual lifting speed is the preset minimum lifting speed; when the lifting speed at the next moment obtained in the corresponding depth stage is greater than or equal to the preset maximum lifting speed of the corresponding depth, the actual lifting speed is the preset maximum lifting speed.

9. A method for controlling cement high-pressure rotary jetting piles, the method utilizing a cement high-pressure rotary jetting pile control device as described in any one of claims 1 to 8 to control the cement high-pressure rotary jetting piles.

10. A cement high-pressure rotary jet pile control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of a cement high-pressure rotary jet grouting pile control method as described in claim 9 are implemented.

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