CN-121384509-B - Underground structure mixing test system considering stratum loss and control method

CN121384509BCN 121384509 BCN121384509 BCN 121384509BCN-121384509-B

Abstract

The invention belongs to the technical field of underground structure tests, and provides an underground structure mixed test system considering stratum loss and a control method thereof, wherein the system comprises a numerical value substructure, a control module and a control module, wherein the numerical value substructure is used for determining boundary node displacement on an interaction boundary corresponding to a current analysis step; the device comprises a boundary node displacement sensor, a virtual test substructure, a parameter inversion module and a parameter analysis module, wherein the boundary node displacement sensor is used for measuring the displacement of a boundary node, the virtual test substructure is used for calculating the force of the boundary node according to the displacement of the boundary node and the current gravity, obtaining a node force simulation value by combining a similar coefficient, further determining a concentrated force for loading, the test substructure is used for obtaining loading force and displacement data through the concentrated force, and the parameter inversion module is used for inverting the loading force and the displacement data to obtain material parameters under the current boundary condition so as to update a numerical model of the test substructure and the boundary node force, further determining a target unbalanced force, and enabling interaction boundaries among structures to meet displacement coordination and force balance. The system provided by the invention realizes the fine simulation of the multi-field coupling mechanism under the complex geological condition, and improves the stratum loss simulation accuracy.

Inventors

DENG PENG
XIONG FENG
ZHANG CHAO
Lang Zhixiong
CHEN RENPENG

Assignees

湖南大学

Dates

Publication Date: 20260512
Application Date: 20251223

Claims (10)

1. A subsurface structure mixing test system that accounts for formation loss, comprising: the numerical value substructure is used for determining boundary node displacement of the interaction boundary according to the dead weight load increment corresponding to the current analysis step in a plurality of analysis steps of the stratum gravity loading process; the virtual test substructure is used for calculating boundary node force according to the boundary node displacement and the current gravity, obtaining a node force simulation value according to the boundary node force and a similarity coefficient, and determining the concentration force of each loading plate according to the node force simulation value and the loading parameters of the loading plates; The test substructure is used for loading the concentrated force to the stratum-tunnel model through the actuator, acquiring the loading force of the actuator and corresponding displacement data, and taking the loading force of the actuator and the corresponding displacement data as current boundary conditions; the virtual test substructure comprises a parameter inversion module, which is used for performing parameter inversion on the loading force of the actuator and corresponding displacement data to obtain target material parameters of the test substructure under the current boundary condition; The virtual test substructure is also used for updating a numerical model of the test substructure according to the target material parameters and updating the corresponding boundary node force under the current boundary condition; The numerical value substructure is further configured to determine a target imbalance force according to the updated boundary node force and a boundary node force corresponding to a previous analysis step, so as to drive a next analysis step until an interaction boundary among the numerical value substructure, the virtual test substructure and the test substructure satisfies displacement coordination and force balance.
2. The subsurface structure mixing test system for accounting for formation loss according to claim 1, wherein said system further comprises: The interaction platform is used for carrying out target data interaction on the numerical value substructure and the virtual test substructure, wherein the target data comprises boundary node force, feedback force, boundary node displacement and feedback displacement.
3. The subsurface structure mixing test system for consideration of formation loss according to claim 2, wherein the interactive platform comprises OpenFresco and LabVIEW.
4. The subsurface structure mixing test system for consideration of formation loss according to claim 1, wherein different formation properties of the numerical substructures correspond to different solidity parameters; the soil body of the numerical value substructure is obtained by adopting four-node entity Quad unit simulation in OpenSees, and the soil body constitutive model is PDMY.
5. The underground structure hybrid test system with formation loss consideration of claim 1, wherein the test sub-structure comprises a reaction frame, a loading system, and a model box; Wherein the loading system comprises a plurality of sets of actuator systems, each set of actuator systems being independently retractable back and forth, and a control system for controlling the state of motion of the plurality of sets of actuator systems.
6. The subsurface structure mixing test system for accounting for formation loss according to claim 1, wherein said test sub-structure comprises: a softening layer, the material of which has the characteristics of plasticity, target yield strength, poisson's ratio of zero and workability.
7. The subsurface structure mixing test system for accounting for formation loss according to claim 6, wherein said test sub-structure further comprises: A soil-structure scale model comprising model soil and a model box; the model soil is standard sand, a rubber film is stuck between the model soil and the side wall of the model box, and a PTFE film and vaseline are attached to the outer surface of the rubber film.
8. A method of controlling a hybrid testing system for a subterranean structure in consideration of formation loss, comprising: determining boundary node displacement of an interaction boundary in a plurality of analysis steps in the stratum gravity loading process based on the numerical substructure according to the dead weight load increment corresponding to the current analysis step; Calculating boundary node force according to the boundary node displacement and the current gravity based on a virtual test substructure, obtaining a node force simulation value according to the boundary node force and a similarity coefficient, and determining the concentration force of each loading plate according to the node force simulation value and loading parameters of the loading plates; loading the concentrated force to the stratum-tunnel model through an actuator based on the test substructure, acquiring actuator loading force and corresponding displacement data, and taking the actuator loading force and the corresponding displacement data as current boundary conditions; performing parameter inversion on the loading force of the actuator and corresponding displacement data based on a parameter inversion module to obtain target material parameters of the test substructure under the current boundary condition; Updating a numerical model of the test substructure according to the target material parameters based on the virtual test substructure, and updating the corresponding boundary node force under the current boundary condition; And determining a target unbalanced force based on the numerical value substructure according to the updated boundary node force and the boundary node force corresponding to the previous analysis step, so as to drive the next analysis step until the interaction boundary among the numerical value substructure, the virtual test substructure and the test substructure meets displacement coordination and force balance.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor, when executing the computer program, implements a method of controlling a subsurface structure mixing test system taking into account formation loss as defined in claim 8.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements a method of controlling a subsurface structure mixing test system taking into account formation loss as defined in claim 8.

Description

Underground structure mixing test system considering stratum loss and control method Technical Field The invention relates to the technical field of underground structure tests, in particular to an underground structure mixed test system considering stratum loss and a control method. Background Under the background of increasingly dense urban underground space development and utilization, the safety and stability problems of underground structures are increasingly concerned, for example, the existence of soil arches can greatly reduce the vertical load borne by the structures and improve the stress safety margin of the structures. In the long-term service process of the existing underground structure, surrounding soil arches can be damaged due to external factors such as adjacent disturbance or strong shock, once the soil arches are unstable, the external load born by the structure is obviously increased, so that the internal force of the structure is suddenly changed, even the structure is damaged and fails, and therefore, how to truly and reasonably reproduce the stress state and the soil arch effect of stratum around the structure in the construction stage of the existing structure in a physical model test is a key point for improving the test precision and the engineering reliability. In the related technology, the simulation method for stratum loss mainly comprises a drainage method, a mechanical convergence method, a pipe pulling method and the like, wherein the actual stratum loss is a progressive process, the drainage method is adopted to simulate the volume loss through instantaneous pressure relief or drainage, the time-related soil creep effect is difficult to reproduce, the drainage method is used to simulate the volume loss through drainage, the simulation result is larger than the actual deviation, the mechanical convergence method is used to simulate the stratum loss through forced shrinkage, the original stress state of the soil (such as insufficient lateral stress release) is possibly changed, the stress-strain relation is distorted, the pipe pulling method is only suitable for simulating sand or loose stratum, the progressive damage process (such as crack expansion) of viscous soil or cemented stratum is difficult to accurately reproduce, the stratum loss simulation effect of the stratum loss simulation method is poor under the complex geological condition, the stratum loss simulation result is inaccurate, and the fine simulation problem of a multi-field coupling mechanism under the complex geological condition is difficult to solve. Disclosure of Invention The invention provides a stratum loss-considered underground structure hybrid test system and a control method, which are used for solving the defect that the stratum loss simulation result is inaccurate due to poor stratum loss simulation effect of a stratum loss simulation method in the prior art under complex geological conditions. The invention provides a underground structure mixing test system considering stratum loss, which comprises the following components: the numerical value substructure is used for determining boundary node displacement of the interaction boundary according to the dead weight load increment corresponding to the current analysis step in a plurality of analysis steps of the stratum gravity loading process; the virtual test substructure is used for calculating boundary node force according to the boundary node displacement and the current gravity, obtaining a node force simulation value according to the boundary node force and a similarity coefficient, and determining the concentration force of each loading plate according to the node force simulation value and the loading parameters of the loading plates; The test substructure is used for loading the concentrated force to the stratum-tunnel model through the actuator, acquiring the loading force of the actuator and corresponding displacement data, and taking the loading force of the actuator and the corresponding displacement data as current boundary conditions; the virtual test substructure comprises a parameter inversion module, which is used for performing parameter inversion on the loading force of the actuator and corresponding displacement data to obtain target material parameters of the test substructure under the current boundary condition; The virtual test substructure is also used for updating a numerical model of the test substructure according to the target material parameters and updating the corresponding boundary node force under the current boundary condition; The numerical value substructure is further configured to determine a target imbalance force according to the updated boundary node force and a boundary node force corresponding to a previous analysis step, so as to drive a next analysis step until an interaction boundary among the numerical value substructure, the virtual test substructure and the test substructure satisfies displacement