基于地应力实测的深部软岩巷道稳定性研究

唐口煤矿埋深较大,地压显现剧烈,在回风石门大巷、西翼辅助运输石门等不同构造部位布置3 个地应力测点,采用YH3B-3型环氧树脂三轴空心包体应变计按应力解除法进行了现场地应力的测试,获得了矿井地应力的大小、方向及分布规律。采用FLAC 3D 研究巷道轴向与水平构造应力呈不同夹角时对深部软岩巷道围岩稳定性的影响,为巷道的合理布置与支护设计提供了可靠依据;当最大水平应力方向与巷道轴向近似平行时,巷道围岩的变形量和塑性区范围较小,巷道变形破坏相对较小;当最大水平应力方向与巷道轴向垂直时,巷道围岩的变形量和塑性区范围最大,巷道变形剧烈、变形破坏严重。

Research on Deep Soft Roadway Stability Based on In-site Geo-stress Measurement

Tangkou Mine has great depth and its underground pressure is intensifying, 3 measuring points were arranged at different sections of return air roadway and west wing of auxiliary transport roadway. The measurement of in-site crustal stresses was carried out with triaxial stress detector of hollow enclave original rocks which was made by YH3B-3-Epoxy and the magnitude, direction and distribution rules of in-site stress were obtained. Effects on stability of roadway surrounding under different angles between the direction of roadway axis and the horizontal tectonic stress was studied using FLAC 3D, it can provide reliable basis for reasonable layout of the roadway and its support design. The result shows that when the direction of roadway axis is parallel to that of the maximum horizontal stress, the effect of tectonic stress on the stability of the roadway is the smallest; the surrounding rock has small deformation and plastic zones; while the direction of roadway axis is vertical to that of the maximum horizontal stress, the surrounding rock has the greatest deformation and plastic zones, and the roadway was destroyed badly.