School of Mining Engineering, Taiyuan University of Technology Research Institute of Mining Technology, Taiyuan
University of Technology

为了充分地回采"三下"煤炭资源,提高煤炭的采出率,同时又能最大限度地减少地下开采对地表沉陷的影响,对"三下"条带开采方法进行分析。采用FLAC3D数值模拟与理论计算相结合的方法,系统研究了在采宽为20 m,留设煤柱宽度分别取10、20、30、40 m时,围岩垂直应力分布和地表沉陷规律。研究结论表明,留设煤柱宽度为采宽的1.5倍左右时,地表最大下沉量为0.042 m,"三下"开采煤炭采出率达到了40%。

In order to fully mine the coal resources under buildings, railways and water bodies, to improve the coal mining rate and to minimize the underground mi ning affected to the surface subsidence, a strip mining method under the surface buildings, railways and water bodies was analyzed. The FLAC3Dnumerical simulation and theoretical calculation combined method were applied to systematically study the vertical stress distribution of the surrounding rock and the surface subsidence law when the mining width was 20 m and the coal pillar width was 10, 20, 30 and 40 m individually. The study conclusions showed that when the coal pillar width was about 1.5 times of the mining width, the max surface subsidence value would be 0.042 m and the coal mining rate mining under the surface buildings, railways and water bo dies was 40%.

“十一五”国家科技支撑计划重点资助项目(2009BAB48B03)；