Quantitative assessment method, apparatus, and device for global stability of surrounding rocks of underground caverns

Patent metadata

Field	Value
Publication number	US-11740385-B2
Application number	US-202218077004-A
Country	US
Kind code	B2
Filing date	Dec 7, 2022
Priority date	Dec 8, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

The present application provides a quantitative assessment method, apparatus and device for global stability of surrounding rocks of underground caverns, which are configured to provide a concrete, practical and effective quantitative assessment solution for a global stability state of the surrounding rocks of the underground caverns. The quantitative assessment method for global stability of surrounding rocks of underground caverns includes: extracting, after determining an assessment task for the global stability of the surrounding rock of a target underground cavern, initial data of the target underground cavern; dividing, according to the initial data, the target underground cavern into different independent cavern units or cavern sections; and rating, according to a preset stability assessment strategy, the eight factors influencing the stability of surrounding rocks of cavern units or the cavern sections are rated respectively, as a global stability assessment result of the target underground cavern.

First claim

What is claimed is:

1. A quantitative assessment method for global stability of surrounding rocks of underground-caverns, comprising:
extracting initial data of a target underground cavern, wherein the initial data comprises: geological structures, rock mass structure types, lithology, initial maximum principal stress values, buried depths, included angles between initial maximum principal stress directions and a cavern axis, dimensions, a cavern axis orientation and use functions of different positions of the target underground cavern;
dividing, according to the initial data, the target underground cavern into different independent cavern units or cavern sections; and
rating, according to a preset stability assessment strategy, seven factors influencing a stability of surrounding rocks of the cavern units or the cavern sections respectively, as a global stability assessment result of the target underground cavern;
said dividing, according to the initial data, the target underground cavern into the different independent cavern units or cavern sections comprising:
dividing, according to the initial data, the target underground cavern into the different dividing, according to the initial data, the target underground cavern into the different independent cavern units or cavern sections in a preset similar judgment range;

the preset stability assessment strategy evaluating from the seven factors: a basic quality (BQ) index of the surrounding rocks, an uniaxial compressive strength R c of the surrounding rocks, a local stability condition of the surrounding rocks, a relaxation/damage condition of the surrounding rocks, a combined relationship between the initial maximum principal stress directions of the surrounding rocks and the cavern axis, a combined relationship between a main structural plane and the cavern axis, and groundwater;
the local stability condition of the surrounding rocks being specifically evaluated from four aspects: a local deformation stability of the surrounding rocks, a block stability of the surrounding rocks, a collapse tendency of the surrounding rocks and a rockburst tendency of the surrounding rocks;
said rating, according to the preset stability assessment strategy, the seven factors influencing the stability of the surrounding rocks of the cavern units or the cavern sections respectively, as the global stability assessment result of the target underground cavern comprising:
rating, according to the preset stability assessment strategy, the seven factors influencing the stability of the surrounding rocks of the cavern units or the cavern sections respectively; and
accumulating the ratings of the seven factors, and confirming the accumulated ratings as stability assessment results of respective cavern units or cavern sections, as the global stability assessment result of the target underground cavern;
said accumulating the ratings of the seven factors, and said confirming the accumulated ratings as the stability assessment results of the respective cavern units or cavern sections comprising:
accumulating the ratings of the seven factors;
determining, based on preset global stability classifications of the surrounding rocks of the target underground cavern and rating ranges thereof, target global stability classifications corresponding to the accumulated ratings, the preset global stability classifications of the surrounding rocks of the target underground cavern being divided into four classifications: stable, basically stable, understable and unstable; and
confirming the accumulated ratings and the target global stability classifications as the stability assessment results of the respective cavern units or cavern sections, and as the global stability assessment result of the target underground cavern;

during the rating, the BQ index of the surrounding rocks comprises:
Class I, BQ>550, Class II, 550≥BQ>450, and a corresponding rating interval of a rating S 1 of the BQ index of the surrounding rocks is 20≥S 1 ≥15; Class III, 450≥BQ>350 and the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks is 15≥S 1 ≥10; Class IV, 350≥BQ>250 and the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks is 10≥S 1 ≥5; Class V, 250≥BQ, and the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks is 5>S 1 ≥0;

wherein the rating S 1 of the BQ index of the surrounding rocks is linearly interpolated from a lower limit of the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks to an upper limit of the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks according to the BQ index of the surrounding rocks; when there is no BQ index monitoring data available, the rating S 1 of the BQ index of the surrounding rocks is performed according to qualitative description of surrounding rocks characteristics of a site; when the BQ index of the surrounding rocks is Class I, the rating S 1 of the BQ index of the surrounding rocks is 20; when the surrounding rocks are hard and brittle and have a brittle failure tendency, the rating S 1 of the BQ index of the surrounding rocks is linearly interpolated from the upper limit of the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks to the lower limit of the corresponding rating interval of the rating S 1 of the BQ index of the surrounding rocks according to the BQ index;
during the rating, rock strength R c /σ max of the surrounding rocks comprises:
R c /σ max ≥7, and a corresponding rating interval of a rating S 2 of the rock strength R c /σ max of the surrounding rocks is 20≥S 2 ≥15; 7>R c /σ max ≥4, and the corresponding rating interval of the rating S 2 of the rock strength R c /σ max of the surrounding rocks is 15>S 2 ≥10; 4>R c /σ max ≥2, and the corresponding rating interval of the rating S 2 of the rock strength R c /σ max of the surrounding rocks is 10>S 2 ≥5; 2>R c /σ max , and the corresponding rating interval of the rating S 2 of the rock strength R c /σ max of the surrounding rocks is 5>S 2 ≥0;
wherein the rating S 2 of the rock strength R c /σ max of the surrounding rocks is linearly interpolated from a lower limit of the corresponding rating interval of the rating S 2 of the rock strength R c /σ max of the surrounding rocks to an upper limit of the corresponding rating interval of the rating S 2 of the rock strength R c /σ max of the surrounding rocks according to the rock strength R c /σ max of the uniaxial compressive strength R c of the surrounding rocks to a maximum principal stress σ max of an initial ground stress; R c /σ max >10, and the rating S 2 of the rock strength R c /σ max of the surrounding rocks is 20; R c /σ max <1, and the rating S 2 of the rock strength R c /σ max of the surrounding rocks is 0;

during the rating, the local stability condition of the surrounding rocks comprises:
stable, and a corresponding rating interval of a rating S 3 of the local stability condition of the surrounding rocks is 20≥S 3 ≥15; basically stable, and the corresponding rating interval of the rating S 3 of the local stability condition of the surrounding rocks is 15>S 3 ≥10; understable, and the corresponding rating interval of the rating S 3 of the local stability condition of the surrounding rocks is 10>S 3 ≥5; unstable, and the corresponding rating interval of the rating S 3 of the local stability condition of the surrounding rocks is 5>S 3 ≥0; wherein the rating S 3 of the local stability condition of the surrounding rocks of a single failure type of a cavern unit or cavern section takes a lowest value in all ratings of the single failure type;

during the rating, the relaxation/damage condition of the surrounding rocks comprises:
3 meters (m)≥D r or 0.15≥D r /B, and a correspondin

Assignees

• Inst Rock & Soil Mech Cas

Inventors

• Xu Dingping
• Jiang Quan
• Feng Xiating
• Li Shaojun
• Liu Xiuyang
• Feng Guangliang
• Huang Shuling

Classifications

• G01V20/00

  Geomodelling in general · CPC title

• G01V99/00 Primary

  Subject matter not provided for in other groups of this subclass · CPC title

• G06Q10/06393 Primary

  Score-carding, benchmarking or key performance indicator [KPI] analysis · CPC title

• G06Q50/08 Primary

  Construction · CPC title

• G06Q50/02

  Agriculture; Fishing; Forestry; Mining · CPC title