Stability Index Priority and Multi-Factor Coupling Classification Method for Extremely-High In-Situ Stress Soft Rock

陈志敏

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Stability Index Priority and Multi-Factor Coupling Classification Method for Extremely-High In-Situ Stress Soft Rock

更新时间：2026-01-04

- Stability Index Priority and Multi-Factor Coupling Classification Method for Extremely-High In-Situ Stress Soft Rock
- Vol. 43, Issue 1, Pages: 78-87(2023)
- 作者机构：
  
  兰州交通大学土木工程学院,甘肃,兰州,730070
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- Published：2023
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陈志敏,唐帅尧,李亚子,龚军,陈宇飞,李增印.极高地应力软岩稳定性指标优先级及多因素耦合分级∗[J].防灾减灾工程学报,2023,43(1):78-87
DOI：

陈志敏,唐帅尧,李亚子,龚军,陈宇飞,李增印.极高地应力软岩稳定性指标优先级及多因素耦合分级∗[J].防灾减灾工程学报,2023,43(1):78-87 DOI：

摘要

极高地应力隧道工程设计施工除了考虑地质构造作用极其强烈以外，强度应力比、地下水、膨胀应力、结构面产状等因素对围岩稳定性的影响也必须考虑，同时隧道轴线与最大应力主方向夹角、隧道断面及面积、岩层厚度及倾角等因素也非常重要。以《工程岩体分级标准》为基础，提出一种极高地应力复杂软岩隧道围岩稳定性因素优先级分析思路，并采用熵权法形成多主因素耦合、次因素修正的围岩分级方法。现场实践表明分级结果与现场施工状态吻合较好，进一步对另两座隧道使用本方法进行验证。结果表明，现行规范中围岩分级因素和方法不适用极高地应力情况，且和影响因素优先级加多因素耦合修正 BQ 值的围岩分级方法结果相差 10% 左右，原因是对极高地应力软岩稳定性影响因素考虑不全面。这种围岩稳定性分级方法具有较好的适用性，且耦合时使用熵权法原理使得结果更加偏向于定量计算，减少了人为因素干扰，结果更加客观真实。

Abstract

In the design and construction of tunnels with extremely high in-situ stress， it is essential to consider not only the geological structure and its strong effect， but also the influence of strength-stress ratio， groundwater， expansive stress， and the occurrence of structural planes on the stability of sur- rounding rock. At the same time， the angle between the tunnel axis and the three principal stress direc- tions， the tunnel cross-section and area， and the thickness and dip angle of rock layer are also very im- portant. Based on the "Engineering Rock Grading Standard"， an approach for prioritizing factors for an- alyzing the stability of the surrounding rock in complex soft rock tunnels with extremely-high in-situ stress is proposed. The entropy weight method is then used to establish a multi-principal factor cou- pling and sub-factor correction method for grading the surrounding rock. The results show that the fac- tors and methods of surrounding rock classification in the current code are not suitable for extremely high ground stress， and the results of surrounding rock classification method with priority of influenc- ing factors and multi-factor coupling correction BQ value yields results that differ by about 10 %. This discrepancy is due to that the factors affecting the stability of soft rock with extremely high ground stress are not fully considered. This method of classifying the stability of the surrounding rock is highly applicable， and the use of the entropy method principle in the coupling process leads to more quantita- tive calculations， reducing the interference of human factors， and making the results more objective and realistic.

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