摘要
为了解决沙吉海煤矿施工时钻进较为困难,泥岩底板遇水泥化严重等问题,沙吉海煤矿对运输平巷砂砾层的顶板控制情况提出了一种无腿棚支护方案:无腿棚横梁采用矿用工字钢,工字钢两端与金属托架连接,巷道两帮采用锚网+钢筋梯支护.采用有限元分析软件Midas-GTS和有限差分软件FLAC3D建立无腿棚支护三维实体模型并进行数值模拟,模拟取得了良好的控制效果.结果表明:巷道左帮支护强度较低,导致左帮变形量远大于右帮;巷道顶部工字钢梁所受的最大弯矩位于距右帮1/4梁的长度处,巷道两顶角处应力集中程度较高;巷道底板和两底角处破坏较为严重,尤其是底板的失稳及左底角的破坏严重影响了左帮的稳定,导致左帮变形量较大.现场实践证明,顶板下沉得到有效控制,该支护方案取得了预期的效果.
In order to solve the problems of drilling difficulty and serious cementation of mudstone floor in Shajihai Coal Mine,aiming at the roof control problem of the haulageway sandy gravel,a legless shed support scheme is proposed in Shajihai Coal Mine.Legless shed beam is made of mine I-beam,the I-beam is connected to the metal bracket at both ends,and the two sides of the roadway are supported by anchor net+steel ladder.Using finite element analysis software Midas-GTS and finite difference software FLAC3 D,a three-dimensional solid model of legless shed support is established and numerical simulation is carried out.The simulation has achieved a good control effect.Results show that the support strength of the roadway left working slope is lower,which results in the deformation of the left working slope much larger than that of the right working slope;the maximum bending moment of the I-steel beam at the top of the roadway is located at the length of the quarter beam from the right working slope.The stress concentration degree is high at the roadway two top corners;the destruction of roadway floor and two bottom corners is serious.Especially the instability of the floor and the destruction of the left bottom corner seriously affect the stability of the left working slope,resulting in large deformation of the left working slope.Field practice show that roof subsidence is effectively controlled,and the support scheme has achieved the expected effect.
作者
秦坚
袁越
付金磊
尚玺
Qin Jian;Yuan Yue;Fu Jinlei;Shang Xi(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Xiangtan 411201,China)
出处
《矿业工程研究》
2020年第3期27-33,共7页
Mineral Engineering Research
基金
国家自然科学基金资助项目(51504091,51774130)
湖南省自然科学青年基金资助项目(2018JJ3166)。
关键词
沙吉海煤矿
砂砾层
顶板控制
无腿棚支护
数值模拟
Shajihai Coal Mine
sandy gravel
roof control
legless shed support
numerical simulation
