淮南煤田顾桥煤矿深煤层地应力测试

Measurement of geostress in deep coal seams in Guqiao coalmine of Huainan coal field

为了研究淮南煤田的地应力分布特征和垂向变化规律,通过对淮南煤田顾桥煤矿的地应力测试和分析,发现顾桥煤矿最大主应力方向在NE56.8°~76.3°之间,平均水平地应力方向为NE67.17°~SW67.17°.通过对矿区地应力随埋深的变化规律研究,结果表明:最大水平主应力SH、最小水平主应力Sh和铅直主应力Sv随着深度的增加而呈线性增加.此外,研究发现:在埋深600 m以浅,最小主应力大于垂向应力;在埋深600 m以深,最小主应力小于垂向应力;在埋深1 000 m以浅,最大主应力大于垂直应力;在埋深1 000 m以深,最大主应力小于垂向应力.依据地应力与埋深的关系,可以把1 000 m深度作为划分深浅煤层的一种重要方法.

Through studying and analyzing the geostress testing result in Guqiao coal mine of Huainan coal field,this study shows that the direction of maximum major stress in the studied area is between NE56.8°~76.3°, while the direction of average major stress is between NE67.17°~SW67.17°. After studying the rules of geostress varying with burial depth, the result of study shows that the SH, Sh and Sv all increase with the increasing of burial depth. Moreover, the result show that the minimum major stress in bigger than vertical stress when the burial depth is lower than 600m; however, the vertical stress is bigger than maximum major stress when the burial depth is deeper than 1000m. According to the study results above, the shallow and deep coal seam is defined in Huainan coal filed.