摘要
为了进一步提升沿空留巷技术的可实施性,对切顶卸压方法进行研究,利用数值模拟软件对静力切顶进行分析发现,在单孔加压下,模型的钻孔壁附近出现较大变形,随着距离钻孔壁越远,其变形量就越小,最大变形量为0.106 mm,最大应力值为125.7 MPa。而在多孔加压下,应力集中主要分布在加压孔双孔连接线及单孔径向位置,并在双孔周边形成最大主应力区。同时对切顶间距和角度进行分析,确定了最佳炮孔间距为0.8 m,最佳角度为65°,为后续静力切顶技术的应用提供了参考。
In order to further improve the feasibility of goaf retaining technology,a study was conducted on the method of top cutting pressure relief.Numerical simulation software was used to analyze the static top cutting.It was found that under single hole pressure,there was significant deformation near the drilling wall of the model.As the distance from the drilling wall increased,the deformation decreased,with a maximum deformation of 0.106 mm and a maximum stress value of 125.7 MPa.Under porous pressure,stress concentration is mainly distributed in the double hole connection line and single hole direction of the pressure hole,and a maximum principal stress zone is formed around the double holes.At the same time,the spacing and angle of the top cutting were analyzed,and the optimal borehole spacing was determined to be 0.8 m and the optimal angle to be 65°,providing reference for the subsequent application of static top cutting technology.
作者
王智兵
Wang Zhibing(Shanxi Coking Coal Huozhou Coal Electricity Dianping Coal Mine,Fangshan Shanxi 033100,China)
出处
《山西冶金》
CAS
2024年第4期117-118,共2页
Shanxi Metallurgy
关键词
数值模拟
静力切顶
切顶角度
炮孔间距
numerical simulation
static top cutting
cutting angle
borehole spacing
