基于空心包体应变法的某矿区软弱岩层地应力测量  

In-situ Stress Measurement of Weak Rock Formation in a Mining Area Based on Hollow Enveloping Strain Method

作　　者：尹爱民 王庆刚 刘建庄 杨金光 耿帅 YIN Aimin;WANG Qinggang;LIU Jianzhuang;YANG Jinguang;GENG Shuai(Shahe Zhongguan Iron Mine Co.,Ltd.,Hebei Iron and Steel Group;School of Mining Engineering,North China University of Technology)

机构地区：[1]河北钢铁集团沙河中关铁矿有限公司 [2]华北理工大学矿业工程学院

出　　处：《现代矿业》2021年第10期98-100,共3页Modern Mining

摘　　要：确定地应力是地下矿山开拓设计和制定支护方案的基本条件。针对某铁矿软弱岩层的构造应力场测试困难问题,以-230 m水平开拓工程为研究背景,采用空心包体应变法进行地应力实测,分析矿区地应力分布的基本规律。空心包体法测试地应力的准确性取决于岩体变形参数的取值,通过对围岩变形特性试验数据的差值处理,得到了应力-应变数据对,准确获得了岩体弹性模量和泊松比的取值。结果表明,-230 m水平最大主应力为16.61 MPa,方位角为157.74°,倾角为1.95°,侧压力系数较大,水平主应力方向与区域地层延展方向近似平行,说明构造作用主导了地应力场分布特征。Determining the in-situ stress is the basic condition for underground mine development de⁃sign and support plan.Aiming at the difficulty in testing the tectonic stress field of a weak rock formation in an iron mine,with the-230 m horizontal development project as the research background,the hollow en⁃veloping strain method was used to measure the in-situ stress and analyze the basic law of the in-situ stress distribution in the mining area.The accuracy of the in-situ stress test by the hollow enveloping method de⁃pends on the value of the rock mass deformation parameters.Through the difference processing of the experi⁃mental data of the surrounding rock deformation characteristics,the stress-strain data pair is obtained,and the values of the rock mass elastic modulus and Poisson's ratio are accurately obtained.The results show that the maximum principal stress at the-230 m level is 16.61 MPa,the azimuth angle is 157.74°,the in⁃clination angle is 1.95°,and the lateral pressure coefficient is relatively large.The horizontal principal stress direction is approximately parallel to the regional stratum extension direction,indicating that tecton⁃ic action dominates the distribution characteristics of the in-situ stress field.

关 键 词：空心包体应变法 地应力 地压监测 侧压系数 

分 类 号：TD311[矿业工程—矿井建设]