摘要
采用应力解除法,对李官集铁矿-120、-220和-320 m 3个中段进行了8个测点的三维地应力测试,并对获得的含有应变计的套孔岩芯进行了室内温度标定和围压率定试验。结果表明:各个主应力均为压应力,没有出现拉应力的现象;矿区以水平构造应力为主,最大水平主应力的数值在10.29～22.16 MPa范围内变化,方向基本上为SE—NW向,竖向主应力接近上覆岩体的自重应力;各测点的最大剪应力较大,其值均大于2 MPa。测量结果为矿井采场合理布局、巷道布置选择和锚杆支护设计提供了可靠依据。
A three-dimensional stress test was conducted at 8 points at-120,-220 and-320 m levels of Liguanji Iron mine,and rock cores with strain gauge obtained was implemented temperature calibration and confining pressure calibration test.The results indicate that each of the principal stresses is in compression stress,without tensile stress.The in-situ stress field of the iron mine is in horizontal tectonic stress,the value of maximum principal stresses range from 10.29 MPa to 22.16 MPa,and their orientation was about SE-NW,the value of vertical principal stresses are close to the weight of top strata in unit area.The value of maximum shear stress at each point are greater,which is more than 2 MPa.The results provide a reliable basis for mining stope proper redistribution,tunnel disposal and anchor support design.
出处
《金属矿山》
CAS
北大核心
2012年第8期15-18,共4页
Metal Mine
关键词
地应力
应力解除法
李官集铁矿
采矿工程
In-situ stress
Stress relief method
Liguanji iron mine
Mining engineering
