摘要
地应力是引起地下工程岩体变形破坏的根本作用力,地应力测试技术在煤矿安全高效开采中具有重要作用。以郑庄煤矿3号和15号煤层为工程背景,基于弹性力学及岩石声发射Kaiser效应对测试地应力大小和方向进行了理论分析,采用在试验室试验对地应力分布规律展开了研究,并与现场测试结果进行对比验证。研究结果表明:3号和15号煤层垂直应力、最大水平主应力及最小水平主应力均随埋深增加而增大,2层煤地应力分布规律十分相似,属中等应力区域;2层煤最大水平主应力>垂直应力>最小水平主应力,即构造应力大于自重应力,属典型以构造应力为主应力场;最大水平主应力方向较稳定,基本集中在N27°W左右;2层煤两顶、底板平均水平主应力(最大水平主应力与最小水平主应力的平均值)与垂直应力比值分别为0.968、0.948、0.938、0.934。3号煤层平均水平主应力与垂直应力之比大于15号煤层。研究结果对采用岩石声发射Kaiser效应测试矿井地应力提供了实用的参考价值与借鉴意义。
In-situ stress is the fundamental force that causes deformation and failure of underground engineering rock mass.In-situ stress testing technology plays an important role in safe and efficient mining of coal mines.Based on the engineering background of No.3 and No.15 coal seams in Zhengzhuang Coal Mine,this paper conducts a theoretical analysis of the magnitude and direction of in-situ stress based on elastic mechanics and rock acoustic emission Kaiser effect.It uses laboratory tests to study the distribution of ground stress,and compare and verify with field test results.The research results show that the vertical stress,the maximum horizontal principal stress and the minimum horizontal principal stress of the No.3 and No.15 coal seams all increase with the increase of the buried depth.The in-situ stress distribution rules of the two coal seams are very similar and belong to the medium stress area;The maximum horizontal principal stress of the coal seam>the vertical stress>the minimum horizontal principal stress,that is,the tectonic stress is greater than the selfweight stress,which is a typical stress field with tectonic stress;the direction of the maximum horizontal principal stress is relatively stable and is basically concentrated around N27°W.The ratio of the average horizontal principal stress(the average of the maximum horizontal principal stress and the minimum horizontal principal stress)to the vertical stress of the No.3 and No.15 coal seams roof and floor are0.968,0.948,0.938,0.934.The ratio of the average horizontal principal stress to the vertical stress of the No.3 coal seam is larger than No.15 coal seam.The research results provide a certain reference value and significance for the use of rock acoustic emission Kaiser effect to test in-situ stress.
作者
刘利斌
段东
郑朝阳
LIU Libin;DUAN Dong;ZHENG Chaoyang(Mining Engineering Institute,Taiyuan University of Technology,Taiyuan 030024,China;Malan Coal Mine,Xishan Coal Electricity Group Company,Taiyuan 030205,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第12期45-50,共6页
Coal Science and Technology
基金
高等学校博士学科点专项科研基金资助项目(20111402120004)
国家科技支撑计划资助项目(2012BAB13B04)。
关键词
声发射
KAISER效应
地应力
单轴加载
主应力
acoustic emission
Kaiser effect
in-situ stress
uniaxial loading
principal stress
