煤矿地下水库储水浸泡对煤柱坝体强度影响的试验研究

Experimental Study of Water Storage Soaking of Coal Mine Underground Reservoir to Coal Pillar Dam Body Strength

为了研究煤矿地下水库储水浸泡作用对于煤柱坝体强度参数的影响,取李家壕煤矿现场煤样为试样,浸泡不同的时间,进行单轴压缩以及巴西劈裂实验,试验结果表明:随着浸水时间的增加煤样单向抗压强度、单向抗拉强度均有所下降,但并未出现规律性递减趋势,而弹性模量波动范围较小,基本不受影响;由于煤样有层理面的存在,煤样的力学性质明显地表现为各向异性。煤样层理垂直于其轴向时,其单轴抗压强度约为煤样层理平行于轴向时抗压强度的2~4倍;而对于单轴抗拉强度,煤样层理垂直于轴向时其值最大,其次为煤样层理平行于轴向且加载方向垂直于层理条件,最小为煤样层理平行于轴向且加载方向平行于层理条件。

In order to study influence of coal mine underground reservoir water storage soaking to coal pillar dam strength parameters,field coal samples were collected in Lijiahao coal mine,UCS and Brazil Split Experiment were proceeded under different soaking time,the results showed that unidirection compressive strength and extension strength all decreased with soaking time increased,without appeared regularity decreased trend,elasticity modulus variation in small range and influence was small,the mechanical property of coal sample appeared obviously anisotropy as bedding plane. When bedding vertical to axial direction,uniaxial compressive strength was 2-4 times of bedding parallel axial direction,to uniaxial extension strength,reached the largest value as bedding vertical to axial direction,secondly was bedding parallel to axial direction and loading direction vertical bedding,the minimum was bedding parallel to axial direction and loading direction parallel to bedding situation.