摘要
结合华岩隧道施工实例,采用三维有限元计算模型模拟隧道穿越煤层采空区施工过程,对施工力学机理及超前大管棚支护作用下围岩的稳定性进行研究。研究结果表明:在隧道顶部存在采空区的条件下,围岩稳定性受到很大影响,其强影响区范围为3~56 m;在强影响区范围采用超前大管棚预支护措施可有效提高围岩稳定性。
Take Huayan Tunnel construction as example,this paper adopted 3D finite element model to simulate the construction process that went through coal seam goaf area,so to study the construction mechanical mechanism and the stability of surrounding rock under the action of large- scale pipe- roof support. Results show： under condition that goaf exist above tunnel,the stability of surrounding rock was greatly influenced and range of intense influence area is 3 ～ 56 m. Adopting large-scale pipe-roof support at intense influence area may effectively improve the stability of surrounding rock.
出处
《公路交通技术》
2017年第1期78-81,87,共5页
Technology of Highway and Transport
基金
国家自然科学基金项目(41601574)
重庆市应用开发计划项目(cstc2013yykfB30005)
重庆市基础与前沿研究计划项目(cstc2014jcyjA30020)
关键词
隧道
采空区
围岩稳定性
管棚
tunnel
goaf area
stability of surrounding rock
pipe-roof
