摘要
太平煤矿主采11^#煤层，煤厚1．5m．由于煤层倾角为55°～63°的大倾角，且顶底板较松软，造成该煤层回采巷道变形和破坏严重，支护困难．通过现场实测，得出了巷道的基本破坏特征是非对称的变形，主要表现为巷顶下沉和顶帮下沉，底帮帮鼓．通过对25113工作面的相似模拟和数值模拟，获得了急倾斜煤层大范围开采过程的围岩运动规律，揭示了顶帮下挫和底帮下滑式的非对称变形机理，指出了巷道主要为拉破坏和剪破坏，支护的重点区域是巷道顶板和底帮上部．根据巷道的变形特征，确定采用内强式锚杆支护方法．根据顶帮下挫的变形特征，提出了优化巷道断面和锚网支护相结合的支护设计的方法．通过实践，表明该方法是成功的．
The main coal seam of Taiping colliery is 11^# coal seam with a thickness of 1.5m. Being steep in dip angle （55°～63°） and soft in immediate roof and floor, the entries in this coal seam are hard to support and have obviously deformed. Based on site measurement, the actual deformation of the entry is asymmetric. The convergence of entry mainly comes from roof and floor sliding alone bedding planes. Through physical and numerical simulation on mining face 25113 of the entries in steep seam, the movement rule of surrounding rocks near the mining face is measured. On the basis of this, the deformation of gob-side retaining entry is usually asymmetric owing to the sliding of both roof and floor along the steep bedding plane. The failure mechanism of entry is mainly the tensional and shearing strain in steep layers. The important areas needing to be well supported are roof rib and upper floor rib-side. According to the deformation feature, the reasonable support way is thought to be the bolting system. So, it is suggested to design an asymmetric shape of the entry to cope with the sliding deformation of surrounding rocks. At last, the supporting design is put forward to optimize the entry shape so as to cope with the asymmetric deformation, and, after that, a proper bolting system is set up to form a reinforced bearing arch in the surrounding rock. This method is used in Taiping colliery and proved to be feasible.
出处
《采矿与安全工程学报》
EI
北大核心
2006年第3期333-336,共4页
Journal of Mining & Safety Engineering
基金
教育部新世纪优秀人才支持计划资助项目(NCET-04-0971)
关键词
急倾斜煤层
沿空留巷
底板滑移
steep coal seam
gob-side entry retaining
floor sliding
