Method and system for simulating contact and interaction between support member and chamber surrounding rock mass

Patent metadata

Field	Value
Publication number	US-11966672-B2
Application number	US-202318352344-A
Country	US
Kind code	B2
Filing date	Jul 14, 2023
Priority date	Jul 15, 2022
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A method and a system for simulating contact and interaction between a support member and a chamber surrounding rock mass are provided in the application. The method includes: obtaining a support scheme of a roadway to be simulated, dividing the roadway to be simulated based on the support scheme to obtain several roadway sections; obtaining physical and mechanical parameters of each rock stratum in each roadway section and an occurrence state of the roadway surrounding rock; constructing particle flow numerical models corresponding to the roadway section; through the particle flow numerical models of every two adjacent roadway sections, obtaining a particle flow meso-structural evolution model of the roadway to be simulated; obtaining meso-mechanical parameters of the roadway to be simulated based on the particle flow numerical models, calibrating the meso-mechanical parameters through the physical and mechanical parameters, establishing the particle flow meso-structural evolution model of the roadway to be simulated.

First claim

What is claimed is:

1. A method for simulating contact and interaction between a support member and a chamber surrounding rock mass, comprising following steps:
obtaining a support scheme of a roadway to be simulated, and dividing the roadway to be simulated based on the support scheme to obtain a plurality of roadway sections; wherein a method for obtaining the roadway sections comprises: dividing the roadway to be simulated according to a unit length of the support member in the support scheme to obtain the plurality of roadway sections;
obtaining physical and mechanical parameters of each rock stratum in each of the roadway sections and an occurrence state of a surrounding rock mass of the roadway; wherein a method for obtaining the physical and mechanical parameters comprises: obtaining standard cylindrical samples of each rock stratum in the roadway to be simulated; carrying out a uniaxial compression test on the standard cylindrical samples to obtain a stress-strain curve of the standard cylindrical samples; and obtaining the physical and mechanical parameters of rocks according to the stress-strain curve; wherein a method for obtaining the occurrence state of the surrounding rock mass of the roadway comprises: obtaining the occurrence state according to overall deformation characteristics of the surrounding rock mass of the roadway to be simulated; the overall deformation characteristics of the surrounding rock mass of the roadway comprise a displacement-time relationship curve concerning a roof and a floor and two sides of the surrounding rock mass of the roadway and deformation characteristics of the surrounding rock mass of the roadway; and the occurrence state comprises mining situations, rock mass parameters, geological structures and in-situ stress;
constructing particle flow numerical models corresponding to the roadway sections based on the physical and mechanical parameters and the occurrence state; wherein a method for constructing the particle flow numerical models comprises: carrying out a discrete element simulation on the rock mass and the support member based on the physical and mechanical parameters and the occurrence state and according to rock stratum conditions of the roof and floor of the roadway sections and the support scheme, comprising constructing particles used for simulating corresponding rock strata and the support member and giving contact models of particle interface characteristics, and establishing a two-dimensional particle flow model; and applying stress and boundary conditions to a boundary of the two-dimensional particle flow model to obtain the particle flow numerical model;
obtaining a particle flow meso-structural evolution model of the roadway to be simulated through the particle flow numerical models of every two adjacent roadway sections; wherein a method for obtaining the particle flow meso-structural evolution model of the roadway to be simulated comprises: unidirectionally superimposing the particle flow numerical model of the i+l-th roadway section on the particle flow numerical model of the i-th roadway section, merging into a new particle flow numerical model, and then repeating the step; and forming the particle flow meso-structural evolution model of the roadway to be simulated when all the particle flow numerical models are merged into one; and
obtaining meso-mechanical parameters of the roadway to be simulated based on the particle flow numerical models, calibrating the meso-mechanical parameters through the physical and mechanical parameters, establishing the particle flow meso-structural evolution model of the roadway to be simulated, wherein the particle flow meso-structural evolution model is used for calculating meso-structural evolution data of the surrounding rock mass of the roadway to be simulated under the support scheme, and a method for obtaining the meso-mechanical parameters comprises: establishing a uniaxial compression particle flow numerical model of standard rock samples by using a parallel bonding model, and obtaining the meso-mechanical parameters matched with results of a physical test by a trial-and-error method, checking and obtaining meso-particle parameters of each stratum and meso-interface contact parameters of the particle flow model;
wherein a method for calibrating the meso-mechanical parameters comprises:
calibrating mesoscopic parameters of the support member according to a yield strength of a steel actually used by the support member; and
establishing a tensile particle flow model of an anchor cable, matching a yield strength of a simulated test anchor cable with the physical test by adjusting the mesoscopic parameters bonded with anchor cable particles, so as to determine meso-contact parameters of an anchor cable member.

2. A system for simulating contact and interaction between a support member and a chamber surrounding rock mass, comprising a roadway division unit, a roadway section parameter unit, a particle flow numerical model unit, a particle flow structure evolution unit and a parameter calibration unit;
wherein the roadway division unit is used for obtaining a support scheme of a roadway to be simulated, and dividing the roadway to be simulated based on the support scheme to obtain a plurality of roadway sections; wherein a method for obtaining the roadway sections comprises: dividing the roadway to be simulated according to a unit length of the support member in the support scheme to obtain the plurality of roadway sections;
the roadway section parameter unit is used for obtaining physical and mechanical parameters of each rock stratum in each of the roadway sections and an occurrence state of a surrounding rock mass of the roadway; wherein a method for obtaining the physical and mechanical parameters comprises: obtaining standard cylindrical samples of each rock stratum in the roadway to be simulated; carrying out a uniaxial compression test on the standard cylindrical samples to obtain a stress-strain curve of the standard cylindrical samples; and obtaining the physical and mechanical parameters of rocks according to the stress-strain curve; wherein a method for obtaining the occurrence state of the surrounding rock mass of the roadway comprises: obtaining the occurrence state according to overall deformation characteristics of the surrounding rock mass of the roadway to be simulated; the overall deformation characteristics of the surrounding rock mass of the roadway comprise a displacement-time relationship curve concerning a roof and a floor and two sides of the surrounding rock mass of the roadway and deformation characteristics of the surrounding rock mass of the roadway; and the occurrence state comprises mining situations, rock mass parameters, geological structures and in-situ stress;
the particle flow numerical model unit is used for constructing particle flow numerical models corresponding to the roadway sections based on the physical and mechanical parameters and the occurrence state; wherein a method for constructing the particle flow numerical models comprises: carrying out a discrete element simulation on the rock mass and the support member based on the physical and mechanical parameters and the occurrence state and according to rock stratum conditions of the roof and floor of the roadway sections and the support scheme, comprising constructing particles used for simulating corresponding rock strata and the support member and giving contact models of particle interface characteristics, and establishing a two-dimensional particle flow model; and applying stress and boundary conditions to a boundary of the two-dimensional particle flow model to obtain the particle flow numerical model;
the particle flow structure evolution unit is used for obtaining a particle flow meso-structural evolution model of the roadway to be simulated through the particle flow numerical models of ever

Assignees

• Univ China Mining

Inventors

• Yin Qian
• Wu Jiangyu
• Jing Hongwen
• Jiang Zheng
• Deng Tianci
• Pu Hai
• Zhang Qiang
• Meng Bo

Classifications

• G06F30/25 Primary

  using particle-based methods · CPC title

• G06F2111/10

  Numerical modelling · CPC title

• G06F30/28

  using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD] · CPC title

• G06F2119/14

  Force analysis or force optimisation, e.g. static or dynamic forces · CPC title

• G06F2113/08

  Fluids · CPC title