摘要
抽采煤层瓦斯是解决煤矿井下瓦斯超限难题的根本措施。但受煤层回采的影响,当回采工作面推过地面瓦斯抽采钻井位置后钻井套管迅速发生破坏,无法充分发挥其抽采采空区瓦斯的效应。因此,基于采场上覆岩层层面剪切滑移效应建立了地面钻井剪切变形破坏模型,并对套管随回采工作面推进在采场倾向方向上的位移变化规律进行了研究,指出:钻井剪切滑移与岩层厚度关系密切,为了减少剪切滑移破坏,地面抽采钻井的合理布孔位置宜为采场中部。同时,运用3DEC对模型进行了模拟分析,并与现场工程实例进行了对比验证。结果证明,模型描述的规律是可靠的,地面钻井布井宜选择靠近采场中部的位置。
Drawing gas is the basic method to solve the gas overrun problem in coal mine.But the coal excavation affects the overlying rock strata greatly and when the excavation face pass through the surface borehole position the drilling casing becomes failured fast.So based on the rock strata shear slippage effect a shear deformation fracture model is set up and the displacement of drilling casing in the dip direction with the advancement of working face is studied,showing that the shear displacement is closely related to the thickness of strata.So,in order to decrease the shear failure,the reasonable position of gas extraction well should be placed at the central part of the mining field.At the same time,an 3DEC simulation model and an engineering example is given to verify the theory model.The result suggests that the model is reliable.
出处
《采矿与安全工程学报》
EI
北大核心
2011年第1期72-76,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2005CB221504)
国家自然科学基金重点项目(50534080)
国家自然科学基金青年基金项目(50904034)
关键词
瓦斯抽采
地面钻井
剪切滑移
空间规律
methane drawing
surface borehole
shear slippage
space rule
