摘要
为了研究不同开采步距及煤层厚度对充填开采工作面围岩稳定性影响,采用PHASE 2D有限元软件建立数值模型。结果表明:开采步距由3 m增至5 m时,工作面前方塑性区略为减小,直接顶下沉量减小6.4 mm,岩层垂直位移减小19%。煤层开采厚度由3 m增至5 m时,工作面前方塑性区显著增大,直接顶下沉量及岩层垂直位移分别增大29%和25%。研究显示适当加快开采速度或开采厚度较小能够降低煤壁破坏范围和提高围岩稳定性。
In order to study the influence of different mining steps and coal seam thickness on the surrounding rock stability of filling mining face,the numerical model is established by PHASE 2D finite element software.The results show that when the mining step is increased from 3 m to 5 m,the plastic zone in front of the working face decreases slightly,the subsidence of direct roof decreases by 6.4 mm,and the vertical displacement of rock strata decreases by 19%.When the coal seam mining thickness increases from 3 m to 5 m,the plastic area in front of the working face increases significantly,the direct roof subsidence and the vertical displacement of rock strata increase by 29%and 25%respectively.The study shows that properly speeding up the mining speed or smaller mining thickness can reduce the failure range of coal wall and improve the stability of surrounding rock.
作者
李鹤鹤
冀宇鑫
宋高峰
Li Hehe;Ji Yuxin;Song Gaofeng(School of Civil Engineering,North University of Technology,Beijing 100144)
出处
《山东煤炭科技》
2022年第6期168-171,共4页
Shandong Coal Science and Technology
基金
国家自然科学基金资助项目(52004010)
北京市自然科学基金(2204080)
北京市教委科技计划一般项目(KM202010009001)。
