岩溶隧道高水压下二次衬砌
结构受力特性与安全性分析
徐林生
李贻伟
(重庆交通大学土木建筑学院重庆400074)】
摘要渝湘高速公路某深埋特长隧道位于岩溶富水区，其左洞ZK38+645~ZK39+040
位于构造溶蚀地段，岩体裂隙较为发育，二次衬砌结构受到高外水压力的作用。本文依据该隧
道实际施工情况，选取8种计算工况，采用大型有限元软件ANSYS10.0,对左洞典型高外水压
力作用的断面进行弹塑性数值模拟分析，详细研究各种工况下二次衬砌结构的受力特性及其
安全性状况，研究结果表明：在高外水压力作用下，该隧道仰拱和边墙的内力都较大，特别是墙
脚的结构安全系数最小，极易产生破坏，设计施筑的二次衬动结构所能承受的最大外水压力不
超过0.5MPa。
关键词公路隧道外水压力数值模拟二次村砌安全系数
Analysis on mechanical characteristics and safety of secondary lining
structure for karst tunnel under high hydraulic pressure
Xu Linsheng Li Yiwei
(School of Civil Engineering Architecture,Chongqing Jiaotong University,
Chongqing,400074,China)
Abstract:The deep-buried mountain tunnel of Yu-Xiang expressway locates in karst and water-
rich zone,the sections from ZK38+645 to ZK39 +040 pass through the jointed rock mass stratum of
tectonic and corroded region where high extemal hydraulic pressure is likely to bear on the lining
structure.According to the actual construction of representative section with high external hydraulic
pressure,eight calculation cases are numerically simulated with elasto-plastic FEM by using ANSYS
10.0 software.The mechanical characteristics as well as safety factors of the secondary lining struc-
ture under different external hydraulic pressure are studied detailedly.The results show that the inter-
nal force is higher at invert and tunnel wall,and the safety factor is smallest at the foot of tunnel wall
where the lining structure is likely to be fractured when bearing the external hydraulic pressure more
than 0.5 MPa.
Key words:highway tunnel;external hydraulic pressure;numerical simulation;secondary lin-
ing;safety factor

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