深井综放沿空掘巷实体煤帮变形破坏机制及控制技术  

Deformation and failure mechanism of entity coal side and its control technology for roadway driving along next goaf in fully mechanized top coal caving face of deep mines

作　　者：张元超[1] 杨圣奇[1,2] 陈淼[1] 臧传伟[3] 龙景奎[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《岩土力学》2017年第4期1103-1113,共11页Rock and Soil Mechanics

基　　金：江苏省杰出青年基金项目(No.BK20150005);国家自然科学基金项目(No.41272344;No.51674251;No.51374199)~~

摘　　要：东滩煤矿1306轨道顺槽掘进期间,实体煤帮出现大变形破坏,挤压鼓出严重。采用离散元数值模拟分析了深井综放沿空掘巷掘进期间基本顶断裂位置的变化及围岩应力、位移的演化规律。揭示了实体煤帮大变形破坏机制:沿空掘巷诱发围岩大结构中关键块体的回转沉降,导致基本顶断裂线向实体煤侧转移。顶板结构的变化引起实体煤侧支承压力的显著升高并产生大范围的高应力挤压区,使实体煤侧表现出大变形与强流变的破坏特征。基于对实体煤帮变形破坏机制的分析,提出高强让压长锚索联合锚网的实体煤帮控制技术。数值模拟与现场试验表明,实体煤帮采用破断力为600 kN,让压点为260~300 kN的φ22 mm×6800 mm长锚索加强支护后,水平大变形得到有效控制,实体煤帮变形量控制在300 mm内,保证了巷道在掘进期间的稳定性。The entity coal side of 1306 tailgate, Dongtan mine, showed evident large deformation and serious squeezing failure during excavation. The UDEC （Universal Distinct Element Code） model of roadway driving along next goal in the fully mechanized top coal caving face of deep mines is established to analyze the failure location of main roof and the evolution law of stress and displacement of surrounding rock. The mechanisms of deformation and failure of the entity coal side are revealed that the rotation of key block in main roof results in the inside shift of its fracture line. The high abutment pressure caused by the movement of the roof structure is distributed on entity coal side. The high squeezing stress finally leads to strong extrusion and rheological behavior of entity coal side. Based on the analysis of failure mechanisms of the entity coal side, supporting measures are proposed by combining bolt-mesh and long cables with high strength and yielding capability. Numerical results and field monitoring data show that the large deformation of entity coal side is decreased effectively, and its displacement is well controlled within 300 mm in the support of qb22 mm×6 800 mm long cables with the strength of 600 kN and yielding capability of 260-300 kN. The stability of 1306 roadway is guaranteed by these supporting measures.

关 键 词：沿空掘巷 实体煤帮 控制技术 深井综放 离散元模拟 

分 类 号：TD353[矿业工程—矿井建设]