连拱隧道中墙顶部回填砼与围岩偏心接触的影响分析  

Numerical Study on the Influence of Eccentric Contact Situation Between Back-fill Concrete on Top of Mid-wall and Surrounding Rock on the Stability of Multi-arch Tunnel

作　　者：唐前松[1] 马云锋[1] 周勇[1] 陈赟[2] 叶斌[3] 

机构地区：[1]湖南省高速公路管理局,湖南长沙410001 [2]长沙理工大学交通运输工程学院,湖南长沙410004 [3]同济大学地下建筑与工程系,上海200092

出　　处：《矿冶工程》2011年第6期9-12,共4页Mining and Metallurgical Engineering

基　　金：湖南省交通运输厅2009年度科技进步与创新计划项目(200925)

摘　　要：根据某高速公路连拱隧道衬砌结构形式,建立了有限元模型,针对回填砼与围岩之间完全左偏心和完全右偏心两种极端接触条件,采用数值模拟方法综合分析了偏心接触时隧道围岩和衬砌结构的变形与受力状况。结果表明,回填砼与围岩之间偏心接触虽然对拱顶沉降影响不显著,但会引起拱顶围岩拉应力和内衬弯矩的显著增长,同时造成中墙产生严重偏压。A finite element model was established based on the lining structure of multi-arch tunnel in expressway. In the light of left and right eccentric situation occurred between backfill concrete and surrounding rock, the deformation and stress of surrounding rock and lining structure under such situation were comprehensively analyzed by numerical simulation method. Results show that such eccentric situation won＇t bring impact on the settlement of arch roof, but will cause the tensile stress on the arch roof surrounding rock and bending moment of lining greatly increased and remarkable eccentric compression occurred on the mid-wall.

关 键 词：连拱隧道 回填砼 围岩 偏心接触 稳定性 数值分析 

分 类 号：TD32[矿业工程—矿井建设]