考虑压力溶腔影响的岩溶隧道围岩稳定性分析  

Surrounding rock stability analysis in karst tunnel considering pressure dissolving cavity

作　　者：张毅[1,2] 王琪 ZHANG Yi;WANG Qi(School of Highway,Chang＇an University,Xi＇an 710064,China;Henan Province Highway Management Center of Toll and Zhengzhou 450000,China;The Sanmenxia to Xichuan Highway Projects Co.,ltd of Henan Province,Sanmenxia 472200,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]河南省收费还贷高速公路管理中心,河南郑州450000 [3]河南省三门峡至淅川高速公路项目有限公司,河南三门峡472200

出　　处：《水资源与水工程学报》2018年第4期208-212,217,共6页Journal of Water Resources and Water Engineering

基　　金：高等学校博士学科点专项科研基金项目(20110205110003)

摘　　要：岩溶地区的富水压力溶腔常常对隧道施工安全造成不利影响。为研究岩溶溶腔对隧道施工过程围岩及支护受力的影响,依托某岩溶隧道,采用Flac3D有限元方法系统开展了不同工况的数值试验研究,主要考虑溶腔大小、溶腔位置及溶腔压力3因素影响,分析了不同工况下围岩受力变形、围岩应力及支护受力情况。结果表明:岩溶隧道溶腔会引起隧道施工过程围岩收敛变形和应力增大,溶腔大小、溶腔位置及溶腔压力均会对收敛变形和应力产生影响,溶腔越大、溶腔存在压力会造成靠近溶腔测点的收敛变形和应力值明显增加,溶腔位于拱顶时对隧道整体受力影响最大,溶腔位于边墙时对隧道影响次之,溶腔位于仰拱时对隧道影响最小;溶腔的存在会对初支受力造成不利影响,引起溶腔近侧初支应力重分布,建议加强溶腔施工段初支整体强度。The pressure dissolving cavity in karst area is often disadvantageous to the safety of tunnel construction.For the study of karst cavity effect on the construction process of the tunnel surrounding rock and the supporting force,relying on a system of karst tunnel,using Flac3 d finite element method to carry out numerical experiments on different conditions,we mainly considered the cavity size,cavity position and cavity pressure effects of the three factors,and analyzed the surrounding rock deformation under different conditions and the stress of surrounding rock and supporting force.The results show that the karst tunnel cavity will cause the deformation of surrounding rock convergence of tunnel construction process and stress increase.The cavity size,cavity position,and cavity pressure can affect the deformation converge and cavity pressure.The greater the cavity will cause near the convergence point and deformation value increased stress.Cavities located at the vault of the tunnel had the greatest impact,followed by the cavities located in the side wall of the tunnel effect.The cavity located in the arch of the tunnel cavity has a minimal impact.The existence of cavity affect the initial supporting force caused by cavity proximal early stress redistribution;therefore,we recommend that to strengthen the primary overall support strength of the cavity construction section.

关 键 词：岩溶隧道 溶腔 围岩稳定性 支护 数值分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]