刘家顺,孙铠洋,左建平,郑智勇,王来贵

• 1:辽宁工程技术大学土木工程学院
• 2:中国矿业大学(北京)力学与土木工程学院
• 3:辽宁工程技术大学力学与工程学院

摘要(Abstract)：

针对西部矿区弱胶结软岩地层巷道围岩自稳能力差、变形大、支护易失效等问题,采用室内试验、数值模拟、现场监测和理论分析相结合的方法,分析了开挖过程中围岩主应力旋转特征,提出针对弱胶结软岩巷道的支护对策。研究结果表明:巷道开挖过程中,巷道围岩主应力旋转幅度经历了平稳增长。剧烈扰动和恢复平稳3个阶段。在工作面推进至监测断面时围岩主应力调整最为剧烈,其中顶板和底板最大主应力增加至初始值的1.62倍,帮部增加至初始值的1.35倍;顶板和底板最大主应力倾角/方位角在岩壁处分别为30°/41°和23°/151°。随远离岩壁,最大主应力倾角/方位角呈先增大后减小的趋势,并且在距离巷道岩壁0.68R处倾角/方位角的变化达到峰值11°/5°、14°/176°;帮部最大主应力旋转角度随远离岩壁呈减小的趋势,倾角/方位角由56°/58°变化至初始状态,分别旋转了34°和32°;顶板围岩应力旋转幅度大于底板和帮部。基于巷道开挖扰动应力旋转特征,提出了考虑主应力旋转效应的弱胶结巷道锚杆(索)+金属网的非对称耦合支护技术,并进行了数值模拟分析和现场工业试验。现场结果表明:采用非对称耦合支护技术可以显著改善围岩应力状态,有效减小巷道围岩塑性范围,控制弱胶结软岩巷道变形。

关键词(KeyWords)： 弱胶结软岩;巷道;主应力旋转;倾角/方位角;非对称耦合支护

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(52374091,52104088);; 国家杰出青年科学基金资助项目(52225404);; 岩土力学与工程安全全国重点实验室开放基金资助项目(SKLGME022021)

作者(Author): 刘家顺,孙铠洋,左建平,郑智勇,王来贵

DOI: 10.13532/j.jmsce.cn10-1638/td.yszt-1035

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