厚泥岩顶板巷道围岩结构特征研究

Research on Structure Characteristics of Roadway Surrounding Rock in Thick Mudstone Roof

针对厚泥岩顶板巷道围岩强度低、巷道易变形的问题,对巷道顶板泥岩进行了物理力学性质试验及围岩结构探测。测试结果表明:顶板泥岩单轴抗压强度为17.59 MPa,弹性模量为3.82 GPa,泊松比为0.223;黏聚力为3.32 MPa,内摩擦角为34.63°;顶板(顶煤)裂隙发育区的范围在1.80 m附近波动,分析阳城煤矿3^(#)~5^(#)煤层的结构特征,可知巷道顶板上部1.81 m内为弱结构区,煤体的完整性受应力作用发生破坏,存在原生及采动裂隙;6301轨道顺槽帮部围岩破坏范围较小,1^(#)~3^(#)测站巷道两帮松动破坏区范围分别为1.10 m、1.18 m、1.29 m、1.31 m、1.32 m、1.28 m,巷道围岩松动圈最大破坏深度为1.32 m。在此基础上,结合巷道围岩地质条件,给出了泥岩顶板巷道支护参数,并进行了工程应用。

Aiming at the problem of low strength and easy deformation of the surrounding rock in the roadway with thick mudstone roof,the physical and mechanical property test and the detection of surrounding rock structure were carried out on the mudstone of the roadway roof.The test results show that:the uniaxial compressive strength of the roof mudstone is 17.59 MPa,the modulus of elasticity is 3.82 GPa,and the Poisson's ratio is 0.223;the cohesive force is 3.32 MPa,and the angle of internal friction is 34.63°;The range of crack development zone in the roof(top coal)fluctuates around 1.80 m.Analyzing the structural characteristics of coal seams 3^(#)-5^(#)in Yangcheng Coal Mine,it is known that the upper 1.81 m of the roadway roof is a weak structural zone,and the integrity of the coal body is damaged by stress,and there are primary and mining fissures;the damage range of the surrounding rock in the gang part of the 6301 railroad track is small,and the range of the two gangs of the roadway of the 1^(#)-3^(#) measuring station loosened and damaged areas are 1.10 m,1.18 m,1.29 m,1.31 m,1.32 m,1.28 m,respectively.The maximum destructive depth of the loosening circle of the surrounding rock is 1.32 m.On this basis,combined with the geological conditions of the surrounding rock of the roadway,the support parameters of the roadway of the mudstone roof plate are given,and the engineering application is carried out.