摘要
以瑞赣高速公路峡山隧道区间为工程背景,针对小净距双洞并行隧道的复杂受力状态,采用有限元法对深埋条件下的小净距段偏压隧道采用不同施工方案进行数值模拟.对双侧壁导坑法、CD法和上下台阶法等不同的施工方法对围岩应力、围岩变形、锚喷支护体系结构内力、拱顶位移及围岩稳定性进行对比.分析不同方案下开挖前、后隧道围岩与支护结构的位移、应力变化规律.在此基础上对不同方案施工过程对隧道中间夹岩的力学行为进行分析,提出了隧道中间夹岩薄弱面的概念,更加明确了该工程地质条件下隧道夹岩的薄弱控制面.并以此为依据指导工程施工,在实际施工中取得了较好的效果.
Based on the engineering background of Rui-Gan Expressway Xiashan tunnel,for complex stress state of two-hole parallel tunnels with small spacing,the finite element method is used in a small clear distance zone of a deep tunnel under different bias conditions to simulate the step construction scheme.The different excavations before and after the tunnel surrounding rock displacement and support structure and the stress variation are analyzed.On the basis of different tunnel construction processes,and the mechanical behavior of rock,the concept of weak rock is proposed to show clearly the engineering geological conditions of weak rock tunnel control panel folder,achieved good results in actual constructions.
出处
《力学与实践》
CSCD
北大核心
2011年第2期46-51,共6页
Mechanics in Engineering
关键词
深埋偏压
小净距隧道
施工方案
力学特征
数值模拟
deep bias
tunnel with small spacing
construction plan
mechanical characteristics
numerical simulation
