摘要
采用Voronoi方法生成柱状节理,并在炮孔壁边界施加爆炸荷载,建立离散元数值模型模拟地下洞室光面爆破过程。通过设置不同地应力水平的工况,来研究爆破开挖过程中地应力和爆炸荷载耦合作用下柱状节理玄武岩的松动机理。结果表明:爆破开挖过程中,柱状节理面存在张开和剪切滑移两种破坏模式,并在开挖卸荷时表现出张开后再闭合的特征。准静态卸荷对围岩松动变形的影响范围小于开挖瞬态卸荷,而考虑爆炸荷载与开挖瞬态卸荷耦合作用的开挖方式下围岩松动范围最大。地应力水平越高,开挖瞬态卸荷导致的松动变形范围越大。
Columnar joints were created by Voronoi method,and blast load was applied to the wall of borehole.Discrete element model was generated to simulate the process of smooth blasting in the underground caverns. Different in-situ stress level was set to study the mechanism of the loosing of columnar jointed basalt under the coupling effect of the in-situ stress and blast load during blasting excavation. Result shows that,two kind of failure mode,open and shear slip,are found in the columnar joints during blasting excavation,and the joint plane closed after the opening of the columnar joints. Compared with the quasi-static unloading,transient unloading has greater effect on the loosing of surrounding rock. The higher the in-situ stress level is,the bigger the loosing deformation zone becomes.
出处
《爆破》
CSCD
北大核心
2016年第1期34-39,共6页
Blasting
基金
国家自然科学基金面上项目(No.51279146
No.51479147)
新世纪优秀人才支持计划资助(NCET-12-0425)
关键词
光面爆破
柱状节理岩体
地应力水平
松动变形
数值模拟
smooth blasting
columnar jointed rock mass
in-situ stress level
loosing deformation
numerical simulation
