深埋高应力大变形巷道支护技术研究  

Research on supporting technology of high stress and large deformation roadways at great depth

作　　者：孙扬[1] 王志远[1] 张爱民[1] 安建英[1] SUN Yang;WANG Zhiyuan;ZHANG Aimin;AN Jianying

机构地区：[1]中国恩菲工程技术有限公司,北京100038

出　　处：《中国矿山工程》2021年第6期26-30,34,共6页China Mine Engineering

摘　　要：近些年来深地问题对矿山开采的影响越来越突出,已引起国内广泛关注。高应力是引发深地问题的主要源头,对于由高应力引发的硬岩岩爆防治方面的研究取得较多成果,但对于高应力引起的软岩大变形问题仍困扰诸多工程。金川二矿区自进入深部开采以来,巷道工程变形大、返修率高,高应力大变形问题仍困扰诸多工程。本文依托金川二矿深部650 m斜坡道工程,重点围绕高地应力、地层构造及支护工况开展高应力大变形巷道支护技术数值分析,建立多维度模型对巷道变形规律及支护技术控制进行研究。数值分析表明:对于深部水平应力场控制的岩层,巷道破坏呈高应力全断面大变形失稳模式;主应力方向对变形规律影响显著,呈现出应力压挤底鼓破坏范围大、持续时间长的特征;锚注支护对于控制底鼓及巷道收敛变形效果显著,柔性支护适度变形能调整释放围岩压力。In resent years,deep earth problems have exerted increasing influence on mine exploitation,raising widespread concern at home and abroad.High stress is the main source of deep earth problems.Though many achievements have been made in the research on prevention and control of hard rock burst due to high stress,the large deformation of soft rock caused by high stress remain a problem that troubles a great number of projects.Since Jinchuan No.2 mining area enters deep mining stage,it has been faced with various problems such as large deformation and high repair frequency of roadways.In this paper,based on the-650 m ramp of Jinchuan No.2 mining area,numerical analysis is carried out on the supporting technology of high stress and large deformation roadways from the aspects of high geostress,strata structure and supporting conditions,and a multi-dimensional model is built to study the deformation rules and supporting technologies of roadways.The numerical analysis indicates that the roadways at the rock stratum controlled by horizontal stress fail in a mode of high-stress,whole section large deformation and instability;deformation rules are obviously reflected in the direction of main stress,where bottom heaving is caused due to the compressive stress and the failure features large range and long duration;bolt-grouting support shows good effect in control of bottom heaving and roadway convergence deformation,flexible support allows proper deformation,which can make the stress of surrounding rock adjusted and released.

关 键 词：深埋高应力 大变形巷道 支护技术 数值分析 

分 类 号：TD322[矿业工程—矿井建设]