Research on failure characteristics of floor heave and support technology in coal roadway
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摘要: 针对煤层巷道底鼓破坏问题，以某矿53082巷为研究对象，采用UDEC离散元模拟软件对该巷道掘进期间的围岩应力状态、位移分布及破坏模式进行了分析研究，结果表明：在较大的水平构造应力下，53082巷底板软弱煤层成为应力释放的主要区域，破坏特征主要表现为浅部拉伸破坏和深部的剪切破坏。针对53082巷原有支护方案无法控制底板位移，造成底鼓比较严重的问题，通过对不同底板支护方案进行支护效果模拟分析，提出了底板注浆与锚杆锚索联合支护方式，试验结果表明：底板注浆与锚杆锚索联合支护方式优于单一的锚杆锚索支护方式，大大改善了底板应力状态，抑制了底板深部的剪切破坏，顶底板位移量控制在150 mm以内，两帮位移量控制在60 mm以内，巷道围岩的控制效果较好。Abstract: In view of problem of floor heave failure in coal seam roadway, taking 53082 roadway of a mine as the research object, the stress state, displacement distribution and failure form of surrounding rock during the roadway excavation were analyzed and studied by UDEC discrete element simulation software. The results show that under relatively large horizontal tectonic stress, the weak coal seam of roadway floor 53082 becomes the main area of stress release, and the main failure characteristics are shallow tensile failure and deep shear failure. In view of problem that the original support scheme of roadway 53082 can not control the floor displacement and causes serious floor heave, a combined support mode of floor grouting and anchor bolt and cable was put forward through simulation analysis of support effect of different floor support schemes. The test results show that the combined support mode of floor grouting and anchor bolt and cable is superior to the single support mode of anchor bolt and cable, and greatly improves stress state of floor, and restrains the shear failure of deep floor, the displacement of roof and floor is controlled within 150 mm, the displacement of two sides is controlled within 60 mm, and the control effect of surrounding rock of roadway is better.
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