岭角隧道节理裂隙岩层稳定性离散元分析  

DEM Analysis on Stability of Jointed and Fractured Rock Strata at Lingjiao Tunnel

作　　者：王根[1] 王林 王颖蛟[1] 

机构地区：[1]长安大学公路学院,西安710064 [2]中铁隧道勘测设计研究院,天津300133

出　　处：《路基工程》2013年第4期24-28,33,共6页Subgrade Engineering

基　　金：广西科学研究与技术开发计划重点项目:南方山区公路隧道施工安全保障与结构长期稳定技术研究(桂科攻10124006-10)

摘　　要：为了研究不同埋深的破碎岩层对隧道稳定性的影响,以及节理裂隙较软岩层下隧道塌方过程的形态规律,依托岭角隧道工程,分别建立不同埋深破碎岩层下隧道开挖、支护的简化模型,应用离散单元法对岩层张开节理、塑性区及支护结构内力进行分析。结果表明:当破碎岩层分布于隧道拱肩及拱顶位置时,隧道稳定性最差,此时其支护结构上的内力值相对最大;节理裂隙较软岩层下隧道塌方一般经历断面收缩变形、大面积岩体塌落、塌方完成三个形态阶段。In order to study effect of broken rocks in different depth on tunnel stability and deformation law of tunnel under jointed and fractured soft rock strata in the course of collapse, combining with Lingjiao Tunnel engineering, the simplified models for excavation and support of tunnel under broken rocks in different depth were established respectively so that by use of discrete element method, open joints, plastic zone in rock strata and internal force of the supporting structure were analyzed. The results show that when broken rocks distributed at arch should and vault of tunnel, the stability is worst with relatively maximum internal force applied to the supporting structure; and generally, collapse of tunnel under jointed and fractured soft rock strata experiences three stages, including section shrinkage and deformation, large area of rock falling, and completion.

关 键 词：隧道工程 破碎岩层 塌方 离散单元法 

分 类 号：TU457[建筑科学—岩土工程]