CN-121615435-B - Intelligent grouting method and related equipment for shield tunnel construction in water-rich sandy pebble stratum

CN121615435BCN 121615435 BCN121615435 BCN 121615435BCN-121615435-B

Abstract

An intelligent grouting method and related equipment for shield tunnel construction of a water-rich sand pebble stratum comprise the steps of obtaining stratum characteristic data of the water-rich sand pebble stratum to be grouting, constructing a shield tunnel three-dimensional finite element model and a seepage undermining two-dimensional discrete element model of the water-rich sand pebble stratum, conducting simulation by utilizing the shield tunnel three-dimensional finite element model to determine initial grouting parameters of the water-rich sand pebble stratum, determining stress amplitude variation values and porosity variation gradients of the water-rich sand pebble stratum under the underground seepage undermining effect by utilizing the seepage undermining two-dimensional discrete element model, dividing the water-rich sand pebble stratum into a plurality of risk areas with different risk levels, adjusting corresponding initial grouting parameters according to different supplementary grouting adjustment strategies aiming at different risk areas, and conducting grouting construction treatment on the corresponding risk areas according to the adjusted grouting parameters. The method can meet the requirements of shield construction in the sandy pebble stratum on grouting uniformity and timeliness.

Inventors

LIU SUMING
ZHA YAN
ZHAO XIAOPING
HU JUN
XIAO FAN
ZHU XIAOFENG
Qing lang
Du Chunlang
YE QING
LUO CHAO

Assignees

中铁隧道局集团路桥工程有限公司
中铁城市发展投资集团有限公司
四川成德轨道交通有限公司

Dates

Publication Date: 20260508
Application Date: 20260203

Claims (10)

1. The intelligent grouting method for the shield tunnel construction of the water-rich sand pebble stratum is characterized by comprising the following steps of: Acquiring stratum characteristic data of a water-rich sandy pebble stratum to be grouting; Based on the stratum characteristic data, constructing a grouting diffusion numerical simulation model of the water-rich sandy pebble stratum, wherein the grouting diffusion numerical simulation model comprises a shield tunnel three-dimensional finite element model and a seepage erosion two-dimensional discrete element model; Performing simulation by using the three-dimensional finite element model of the shield tunnel to determine initial grouting parameters of the water-rich sandy pebble stratum; Determining a stress amplitude reduction change value and a porosity change gradient of the water-rich sandy pebble stratum under the groundwater seepage erosion effect by using the seepage erosion two-dimensional discrete element model; Dividing the water-rich sandy pebble stratum into a plurality of risk areas with different risk grades based on the stress reduction change value and the porosity change gradient; aiming at different risk areas, according to different supplementary grouting adjustment strategies, corresponding initial grouting parameters are adjusted to obtain adjusted grouting parameters; grouting construction treatment is carried out on the corresponding risk areas according to the adjusted grouting parameters; the construction method of the three-dimensional finite element model of the shield tunnel comprises the steps of utilizing three-dimensional modeling software to establish a water-rich sand pebble stratum simulation model for representing stratum morphology and distribution, shield tunnel size and construction facilities according to a selected shield tunnel excavation area, and taking the water-rich sand pebble stratum simulation model as the three-dimensional finite element model of the shield tunnel; Determining a target section based on geological survey data of a water-rich sandy pebble stratum and an analysis result of the shield tunnel three-dimensional finite element model to construct a corresponding particle flow discrete element model and serve as the seepage erosion two-dimensional discrete element model, wherein the seepage erosion two-dimensional discrete element model is used for carrying out seepage erosion simulation on the section so as to calculate a porosity change gradient, a stress reduction change value, an erosion area sectional area, average porosity and an erosion area volume; the calculation rule of the seepage corrosion two-dimensional discrete element model comprises the steps of establishing a spring-damper model between particles in a contact range and calculating contact force between the particles, wherein the spring-damper model is based on Newton's second law, and the equation is as follows: F_c=k×Δx+c×v 1 +m×a Wherein F_c is the inter-particle contact force, k is the spring rate, deltax is the inter-particle relative displacement, c is the damping coefficient, v 1 is the relative velocity, m is the particle mass, and a is the particle acceleration; the calculation rule also comprises a discrete element seepage influence formula, wherein the discrete element seepage influence formula is as follows: F_d=0.5×C_d×ρ_f×A_p×|u_f-u_p|×(u_f-u_p) wherein F_d is the drag force, C_d is the drag force coefficient, ρ_f is the fluid density, A_p is the particle flow area, u_f is the percolation velocity, and u_p is the particle movement velocity.
2. The intelligent grouting method for shield tunnel construction of the water-rich sandy pebble stratum according to claim 1, wherein the acquiring stratum characteristic data of the water-rich sandy pebble stratum to be grouting comprises the following steps: performing advanced geological survey on the water-rich sandy pebble stratum to obtain geological survey data; obtaining stratum monitoring data by using monitoring points laid on a water-rich sand pebble stratum, wherein the monitoring points comprise pressure monitoring points and porosity monitoring points; the formation property data is determined based on the geological survey data and the formation monitoring data.
3. The intelligent grouting method for shield tunnel construction of the water-rich sandy pebble stratum according to claim 1, wherein the step of performing simulation by using the three-dimensional finite element model of the shield tunnel to determine initial grouting parameters of the water-rich sandy pebble stratum comprises the following steps: performing simulation of grouting construction treatment based on the shield tunnel three-dimensional finite element model so as to predict the slurry diffusion range and the stratum settlement trend of the grouting construction treatment of the water-rich sandy pebble stratum; And determining the initial grouting parameters of the water-rich sandy pebble stratum according to the slurry diffusion range and the stratum settlement trend.
4. The intelligent grouting method for shield tunnel construction of the water-rich sandy pebble stratum according to claim 1, wherein the adjusting the corresponding initial grouting parameters according to different supplementary grouting adjustment strategies for different risk areas to obtain adjusted grouting parameters comprises: determining loss coefficients associated with risk levels of the risk areas according to different risk areas; determining at least one of the volume, the average porosity and the sectional area of the submerged area of the water-rich sand pebble stratum under the submerged action of underground water seepage by utilizing the seepage submerged two-dimensional discrete element model; the adjusted grouting parameter is determined based on at least one of the submerged region volume, average porosity, submerged region cross-sectional area, and the loss factor.
5. The intelligent grouting method for shield tunneling construction of a water-rich sandy pebble stratum according to claim 4, wherein said determining the adjusted grouting parameters based on at least one of the volume of the submerged area, the average porosity, the cross-sectional area of the submerged area, and the loss factor comprises: Determining a pore channel compensation coefficient positive with respect to the gradient of porosity variation; and determining the adjusted grouting parameter based on at least one of the volume of the submerged region, the average porosity and the sectional area of the submerged region, the loss coefficient and the pore channel compensation coefficient.
6. The intelligent grouting method for shield tunneling construction of a water-rich sandy pebble stratum according to claim 1, wherein after dividing the water-rich sandy pebble stratum into a plurality of risk areas with different risk levels based on the stress reduction variation value and the porosity variation gradient, the method further comprises: Determining an optimization formula of a grouting path of grouting construction treatment, wherein the optimization formula comprises an association relation among the total length of the path among grouting points, the distance among adjacent grouting points and the risk weights of the grouting points, and the risk weights of the grouting points are determined based on the risk grades of the corresponding risk areas; and determining a target grouting path of grouting construction treatment based on the optimization formula.
7. The intelligent grouting method for shield tunnel construction of the water-rich sandy pebble stratum according to claim 1, wherein after grouting construction treatment is carried out on the corresponding risk area according to the adjusted grouting parameters, the method further comprises the following steps: monitoring at least one of current grouting pressure, current slurry flow, current slurry diffusion range and current stratum stability parameters in the grouting construction treatment process in real time; And if at least one of the current grouting pressure, the current slurry flow, the current slurry diffusion range and the current stratum stability parameter is not in the corresponding preset allowable range, stopping executing grouting construction treatment by adopting a progressive stopping strategy.
8. An intelligent grouting system for water-rich sand pebble stratum shield tunnel construction, which is characterized in that the intelligent grouting system for water-rich sand pebble stratum shield tunnel construction is used for executing the intelligent grouting method for water-rich sand pebble stratum shield tunnel construction according to any one of claims 1 to 7.
9. The utility model provides an intelligence slip casting device of rich water sand cobble stratum shield tunnel construction which characterized in that, the intelligence slip casting device of rich water sand cobble stratum shield tunnel construction includes: One or more processors and memory; The memory is coupled to the one or more processors, the memory is for storing computer program code, the computer program code comprising computer instructions that the one or more processors invoke the computer instructions to cause the intelligent grouting device of the water-rich sandy pebble formation shield tunnel construction to perform the intelligent grouting method of the water-rich sandy pebble formation shield tunnel construction of any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium comprises instructions that, when run on an intelligent grouting system for water-rich sandy pebble strata shield tunnel construction, cause the intelligent grouting system for water-rich sandy pebble strata shield tunnel construction to perform the intelligent grouting method for water-rich sandy pebble strata shield tunnel construction of any one of claims 1 to 7.

Description

Intelligent grouting method and related equipment for shield tunnel construction in water-rich sandy pebble stratum Technical Field The application relates to the technical field of tunnel engineering, in particular to an intelligent grouting method and related equipment for shield tunnel construction of a water-rich sandy pebble stratum. Background As a typical complex geological condition in the shield tunnel construction process, the water-rich sandy pebble stratum has the characteristics of uneven rock property, loose structure and the like. Because the particle structure is loose and the clearance rate is large, the problems of tunnel water burst, leakage, stratum settlement and the like easily occur in the construction process, and the safety and stability of tunnel construction are directly affected. Particularly in the long-distance underpass construction of urban dense areas, the complexity of the sandy pebble stratum obviously increases the construction difficulty, and higher requirements are put on the precision, efficiency and adaptability of the grouting process. However, the grouting method in the related art generally relies on manual experience to control slurry proportioning and grouting pressure, lacks the accurate adjustment capability of real-time response, and is difficult to meet the requirements of shield construction in a sandy pebble stratum on grouting uniformity and timeliness. Disclosure of Invention The application provides an intelligent grouting method and related equipment for shield tunnel construction in a water-rich sandy pebble stratum, and aims to meet the requirements of shield construction in the sandy pebble stratum on grouting uniformity and timeliness. According to the first aspect, the intelligent grouting method for the shield tunnel construction of the water-rich sand pebble stratum comprises the steps of obtaining stratum characteristic data of the water-rich sand pebble stratum to be grouting, constructing a grouting diffusion numerical simulation model of the water-rich sand pebble stratum based on the stratum characteristic data, wherein the grouting diffusion numerical simulation model comprises a shield tunnel three-dimensional finite element model and a seepage submergence two-dimensional discrete element model, conducting simulation by using the shield tunnel three-dimensional finite element model to determine initial grouting parameters of the water-rich sand pebble stratum, determining a stress amplitude reduction change value and a porosity change gradient of the water-rich sand pebble stratum under the submergence effect of underground water seepage by using the seepage submergence two-dimensional discrete element model, dividing the water-rich sand pebble stratum into a plurality of risk areas with different risk levels based on the stress amplitude reduction change value and the porosity change gradient, adjusting corresponding initial grouting parameters according to different supplementary grouting adjustment strategies, obtaining adjusted grouting parameters, and conducting grouting treatment on the corresponding risk areas according to the adjusted grouting parameters. In the embodiment, the comprehensive simulation of the grouting process of the water-rich sand pebble stratum is realized by constructing a double-scale simulation system comprising a macroscopic three-dimensional finite element model and a microscopic two-dimensional discrete element model. The three-dimensional finite element model is used for predicting slurry diffusion and stratum settlement from a global view angle, and provides a macroscopic basis for setting initial grouting parameters. More importantly, a two-dimensional discrete element model capable of simulating particle behaviors is introduced and is specially used for quantifying the erosion caused by groundwater seepage, namely, the hysteresis sedimentation risk which is difficult to predict in the past is converted into a specific and measurable index by calculating stress reduction and porosity change gradient. Based on the risk index, partitioning is carried out, and a differentiated supplementary grouting adjustment strategy is formulated, so that the grouting construction process becomes targeted and refined risk management and control. The technical logic of macroscopic parameter determination, microscopic quantification risk and precise zoning Shi Ce can obviously improve the scientificity, uniformity and timeliness of grouting, thereby ensuring the construction safety and long-term stability of the shield tunnel. In combination with some embodiments of the first aspect, in some embodiments, obtaining formation property data of the water-rich sandy pebble formation to be grouting includes performing advanced geological survey on the water-rich sandy pebble formation to obtain geological survey data, obtaining formation monitoring data by using monitoring points distributed on the water-rich sandy pebble format