摘要
通过对高地应力区深埋隧道上下台阶法施工过程的弹塑性三维有限元数值模拟,对初期支护锚杆、喷射混凝土、钢支撑及二次衬砌混凝土的力学特性进行了分析。结果表明:喷射混凝土拱顶、拱肩处的位移和最大主应力及拱肩处的剪应力较大,受钢支撑影响显著;隧道开挖后的应力集中对其周边1.0 m范围内的锚杆轴力有很大的影响;钢支撑轴力和竖向剪断力随距掌子面距离的增大而增大;二次衬砌不同层位、不同位置处的主应力和剪应力有较大的区别。分析结论为高地应力区深埋隧道支护结构设计及其稳定性评价提供了依据。
Mechanical were analyzed area. Results through properties of bolt, shotcrete, steel support structure of initial support and second lining elasto-plastic 3D finite-element numerical simulation of bench tunneling in high geo-stress of analysis indicate that displacement, maximum principal stress of shotcrete is big at crown and displacement, maximum principal stress, shearing stress is big at spandrel, but also the displacement and stress has sharp change by steel support structure effecting. Stress concentration strongly influenced on bolt axis stress at a range of 1.0 m surrounding rock. Axis stress and vertical moment of shearing of steel support structure increase gradually with distance augmentation to the face. Different principal stress and shearing stress exist at various layers and positions of second lining. The conclusion provides a reference for deep-buried tunnel design of support structure and stability evaluation in high geo-stress area.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第2期101-105,共5页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金重点资助项目(50334060)
重庆市自然科学基金资助项目(2006BB6167)
关键词
隧道工程
软弱围岩
数值模拟
支护结构
tunnel engineering
soft and weak surrounding roek
numerical simulation
support structure
