永川煤矿地应力测试及地应力变化特征

针对永川煤矿深部开采条件和地质构造情况,指出了现场地应力测点选择和测点布置的基本要求;采用空芯包体地应力测量法,确定了永川煤矿南二-190m水平和-350m水平两测点地应力大小和方向;结合矿井区域地质构造和煤岩层赋存条件,分析了永川煤矿深部地应力的特点。研究表明,该研究区域的地应力基本上是由自重应力和水平构造应力所构成,在该区域-190m水平附近,自重应力和构造应力在地应力中所占比重相当,在该区域深部水平(-350m水平)附近,地应力主要以自重应力为主,一般自重应力是水平构造应力的2倍左右;该研究区域最大主应力σ1约为15MPa,其方向稳定,属中偏高地应力区域。

Measurement and Variation Characteristics of Strata Stress in Yongchuan Coal Mine

To counter the deep mining condition s and geological structure in Yongchuan Coal Mine, this paper pointed out the basic requirements for the selection and arrangement of the measuring points of strata stress at the site; the degree and direction of the strata stress at two measuring points at Southern -190m and -350m level in Yongchuan Mine were determined with hollow inclusion strata stress measuring technique. The paper also analyzed the features of the strata stress in the deep part of Yongchuan Mine. Study showed that the strata stress in this region was basically constituted by gravity stress and horizontally structured stress, the gravity stress and structured stress were basically equal near -190m level in this region, but near -350m level, the strata stress was mainly the gravity stress, in general, the gravity stress was about two times of the horizontally structured stress. The maximum main stressσ1 in this region was about 15 Mpa, it has a stable direction and belong a region with medium and larger stress.