膨胀剂静力切顶卸压参数模拟研究
Simulation Study on Static Top Cutting and Pressure Relief Parameters of Expansion Agents
王智兵1
作者信息
- 1. 山西焦煤霍州煤电店坪煤矿,山西 方山 033100
- 折叠
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0.8m,最佳角度为65°,为后续静力切顶技术的应用提供了参考.
Abstract
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.
关键词
数值模拟/静力切顶/切顶角度/炮孔间距Key words
numerical simulation/static top cutting/cutting angle/borehole spacing引用本文复制引用
出版年
2024
NETL
NSTL
万方数据