摘要
大量的工程实践表明,坚硬的岩石在深部也表现出流变特性.针对深部软岩巷道大变性、支护困难的问题,除了采用锚网索主动支护、U型钢或者钢管混凝土等被动支护技术外,开卸压槽是一种控制深部围岩变形的可行方法.本文建立了开槽卸压等效椭圆模型,分析了圆形巷道开槽前后的周边应力场变化规律,揭示了开槽卸压机理.采用FLAC3D模拟了多个开槽参数对直墙半圆拱巷道的影响规律并加以分析,得出了卸压槽开挖最优方案:卸压槽位于直墙上距底板高度为直墙高度为75.0%,深度为巷道宽度的62.5%,高度为直墙高度的15.0%.模拟结果得知基于该方案开槽卸压后,应力明显向深部转移,由于压力导致卸压槽闭合,因此垂直位移明显,而水平位移是原位移的38%,能较好地维护帮部稳定.
Many engineering practices indicate that the rheological proper appears in hard rock buried in deep coalmines.Aiming at solving the problem of large deformation and support difficulties in deep roadways,the traditional support technologies are anchor cable support,Ushaped steel support and concrete pipe support,without which the Destressing by Cutting Groove is also a feasible method to control rock deformation of deep buried roadways.In this paper,the equivalent elliptical model of Destressing by Cutting Groove is established to analyze the variation of surrounding stress filed of circular roadway after cutting groove,which reveals the mechanism of Destressing by Cutting Groove.The FLAC3 Dis used to analyze the influence of several slotting parameters on the roadway shaped semi-circular archway and the straight wall.The optimal parameters of the destressing groove are obtained:the location is at the level of 75.0% of the height of the roadway sidewall,the depth is 62.5% of the width of roadway and the height is 15.0%of the roadway sidewall’s height.The simulation results show that af-ter the groove is relieved by the scheme,the stress is obviously shifted to the deep surrounding rock.The vertical displacement is obvious due to the closing of the pressure relief groove,and the horizontal displacement is 38% of the original displacement in this maintenance of the stability of the sidewall.
作者
左建平
史月
刘德军
孙运江
陈岩
ZUO Jianping;SHI Yue;LIU Dejun;SUN Yunjiang;CHEN Yan(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Beijing 100083,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第1期1-11,共11页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51622404
11572343)
中国矿业大学(北京)越琦杰出学者计划
"万人计划"青年拔尖人才联合资助项目
关键词
深部软岩巷道
开槽卸压
等效椭圆模型
模拟分析
优化方案分析
deep soft rock roadway
Destressing by Cutting Groove
equivalent ellipse model
simulation analysis
optimize project analysis
