小净距隧道开挖工艺对围岩稳定性的影响  

Effects of excavation processing technology on the stability of surrounding rocks of neighborhood tunnel

作　　者：许书生[1] 曾祥国[1] 姚安林[2] 王清远[1] 陈华燕[1] 赵师平[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]西南石油大学建筑工程学院,四川成都610500

出　　处：《四川建筑科学研究》2009年第3期91-95,共5页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50490272);四川省杰出青年基金资助项目(06ZQ026-004)

摘　　要：为研究小净距隧道的不同开挖工艺对围岩稳定性的影响,对重庆花土岗隧道分别利用全断面法、上下台阶法和单侧壁导坑法进行了开挖有限元数值模拟,分析了小净距隧道不同施工方法对洞周围岩稳定性的影响。结果表明:全断面法对隧道围岩及中夹岩柱的水平位移和应力影响较大;上下台阶法和单侧壁导坑法影响相对较小。施工中应根据实际情况选择合理的开挖方法,及时施作支护并加强监测,保证施工质量。本文的分析方法和计算结果对小净距隧道设计、施工具有一定的参考价值。The practical project of Chongqing Huatugang Tunnel is simulated by numerical method in this paper. Three processing technologies are conducted to investigate the effect on stability of surrounding rocks by excavation neighborhood tunnel： full section excavation, step excavation and single sidewall excavation. The result shows that ： the horizontal displacement and stress of surrounding rocks and middle wall are greatly influenced by full section excavation of the tunnel, however, the other two excavation methods are of comparatively smaller effects. In order to ensure the quality of construction, choosing a logical excavation method based on practice, building the lining in time and strengthening the inspection during the construction are advisable. The analytical method and calculation conclusion in this paper may give some references for the design and construction of neighborhood tunnel.

关 键 词：小净距隧道 开挖工艺 围岩稳定性 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]