存在局部破碎带条件下海底隧道渗透稳定性分析  

Analysis on Seepage Stability of Subsea Tunnel in Rock Mass with Local Fracture Zones

作　　者：王建新[1] 郑颖人[2] 包林海[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]后勤工程学院,重庆400041

出　　处：《隧道建设》2011年第4期457-462,共6页Tunnel Construction

基　　金：中央级公益性科研院所基本科研业务专项(ZDJ2011-10)

摘　　要：根据渗流有限元计算方法及岩石强度折减理论,研究考虑海水渗透压力作用下,存在破碎带海底隧道围岩的流固耦合稳定性分析方法,并将此方法应用于青黄海底隧道工程,进行隧道围岩堵水和不堵水2种条件下的渗流场以及隧道的渗透稳定性计算分析。结果表明:由于破碎带的存在,海水入渗将直接导致隧道围岩范围内水头升高,渗水量增大,特别在破碎带附近产生较高的水力梯度,这使隧道的安全系数大大降低;堵水加固后,隧道的整体安全系数有所提高,围岩内渗流量明显减小,但是在堵水部位,隧道围岩的梯度有所升高,所以应该加大堵水部位围岩的支护强度。并讨论海底隧道设计中渗透压力梯度的考虑及堵水加固措施的选择。The method of fluid-solid coupling stability analysis for subsea tunnels in rock mass with fracture zones under seawater seepage pressure is studied on basis of seepage finite element simulation method and rock strength reduction theory.The mentioned analysis method is applied in Qingdao-Huangdao subsea tunnel to analyze the seepage field of the rock mass with/without water-sealing consolidation and to analyze the seepage stability of the tunnel.Conclusions drawn are as follows： due to the fracture zones,the water head in the rock mass rises and the water seepage quantity increases;high hydraulic gradient occurs near the fracture zones,which dramatically reduces the safety coefficient of the tunnel;after water-sealing consolidation,the overall safety coefficient of the tunnel is improved and the seepage quantity in the rock mass is obviously reduced;at the water-sealing positions,however,the hydraulic gradient of the rock mass increases,therefore,the support at these positions should be strengthened.

关 键 词：海底隧道 渗流有限元 强度折减法 渗透压力 局部破碎带 稳定性分析 

分 类 号：U451[建筑科学—桥梁与隧道工程]