复采动压扰动下巷道交岔点围岩力学响应及控制分析

Surrounding Rock Mechanical Response and Control of Roadway Intersection under Repeated Mining Dynamic Pressure

对旧采区进行复采时工作面会多次穿越空巷。过空巷时回采巷道与空巷会形成多个交岔点。交岔点附近回采巷道变形大、交岔点处顶板冒落、两帮破碎是复采回采巷道稳定性的主要问题。圣华煤业现场统计观测表明,在超前支承压力作用下交岔点附近巷道变形严重、空巷冒落次数增加,围岩破碎。建立了交岔点围岩应力分布的力学模型,分析了交岔点处围岩应力分布情况,结合现场实测和相似模拟等综合手段给出了交岔点处煤柱压碎区的范围。分析了交岔点处围岩变形与破坏规律,提出了交岔点跨度的计算方法。现场实测表明设计支护强度能够保证巷道支护安全。

The working face would crossed abandoned roadway many times during repeated mining of old mining area, then many intersectionsbetween mining roadway and abandoned roadway would be formed during passed abandoned roadway. The main problems ofrepeated mining roadway stability around intersection were large deformation, roof collapse in intersection, two sides broken. The filedstatistics of Shenghua coal mine confirmed the following characters would appeared in roadway around intersection under abutment pressure,which included deformation largely, roof collapse in abandoned roadway increased and surrounding rock broken, then the mechanicalmodel of surrounding rock stress distribution on intersection was built, and stress distribution was analyzed, the coal pillarbroken scope around intersection was put forward under filed test and similarly simulation, and surrounding deformation and broken lawof intersection were analyzed , then the calculation method of intersection span was put forward, the filed test confirmed that the supportingstrength could ensured roadway supporting safety.