Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology
College of Energy Engineering, Xi’an University of Science and Technology
Xi’an Branch, CCTEG Beijing Huayu Engineering Co. , Ltd.
China Coal Technology Engineering Group Chongqing Research Institute

为了探究相邻空区影响下三软煤层巷道掘进时不同煤柱宽度下巷道围岩变形破坏规律,采用理论计算、数值模拟、物理相似模拟与现场实测相结合的研究方法,分析存在临空区后不同区段煤柱宽度下巷道围岩应力演化规律、塑性破坏范围以及位移分布特征。结果表明:临空区是造成巷道掘进后非对称破坏的主要原因,使煤柱主应力方向与垂向夹角增大,巷道两帮应力呈煤柱侧大于实体煤侧的非对称分布特征;三软巷道破坏形式以剪切破坏为主,破坏主体为两帮,随着煤柱宽度增大,主应力方向与垂向夹角减小,巷道围岩破坏程度降低,临空区对巷道不同位置的影响程度不同,巷道中部围岩破坏程度大于端头处且煤柱侧破坏程度大于实体煤侧;煤柱宽度增大对巷道围岩应力以及煤柱破坏的改善程度有限,现场结果显示当煤柱宽度为20m时巷道正常维护满足需求。

In order to explore the deformation and failure law of roadway surrounding rock under different coal pillar widths during roadway excavation in three-soft coal seam under the influence of adjacent gob, the research methods of theoretical calculation, numerical simulation, physical similarity simulation and field measurement were used to analyze the stress evolution law, plastic failure range and displacement distribution characteristics of roadway surrounding rock under different coal pillar widths with adjacent gob. The results show that the gob-side zone is the main reason for the asymmetric failure after roadway excavation, which increases the angle between the principal stress direction and the vertical direction of the coal pillar, and the stress distribution in the two sides of the roadway is asymmetric, the coal pillar side is greater than the solid coal side.Dominate failure form of the three-soft roadway is shear failure, which mainly occurs in the two sides. With the increase of 1第56卷第3期 COAL ENGINEERING Vol. 56, No. 3coal pillar width, the angle between principal stress direction and vertical direction decreases, and the failure degree of roadway surrounding rock decreases.The influence degree of gob-side zone on different positions of the roadway is different.The failure degree of surrounding rock in the middle of roadway is greater than that at the end, and the failure degree of coal pillar side is greater than that of solid coal side. Increasing the coal pillar width has insignificant improvement on the surrounding rock stress and coal pillar failure. According to the field results, when the width of the coal pillar is 20 m, the demand is satisfied for normal maintenance of the roadway.

国家自然科学基金面上项目(52174126);陕西省杰出青年科学基金项目(2023-JC-JQ-42);陕西高校青年创新团队项目(2022-2023)

解盘石, 林伟典, 张小明, 等. 相邻空区影响下三软巷道变形破坏规律与煤柱留设宽度研究 [J]. 煤炭工程,2024, 56(3): 1-9.