高海拔寒区隧道衬砌背后积水冻胀分析  

Frost Heaving Analysis of Water Behind Tunnel Lining in High Altitude Cold Region

作　　者：谭书平 卢锋 TAN Shuping;LU Feng(Sichuan Jiuma Expressway Group Co.,Ltd.,Aba Tibetan and Qiang Autonomous Prefecture,Sichuan 624000,China;School of Emergency Management,Xihua University,Chengdu,Sichuan 610039,China)

机构地区：[1]四川久马高速公路有限责任公司,四川阿坝藏族羌族自治州624000 [2]西华大学应急管理学院,四川成都610039

出　　处：《公路工程》2024年第2期46-53,共8页Highway Engineering

基　　金：四川省自然科学基金项目(2022NSFSC1025)。

摘　　要：高海拔寒区隧道围岩内部裂隙水的冻结膨胀会对隧道结构的安全产生重要影响。基于寒区隧道衬砌背后积水冻胀理论建立高海拔寒区公路隧道地层结构模型,研究了隧道衬砌背后积水冻胀过程中围岩与支护结构相互作用关系演变,分析了不同冻胀率下空洞储水冻胀对衬砌应力分布和结构变形的影响。研究结果表明:衬砌最大主应力随冻胀率的增大而增加,在冻胀率为6%时达到峰值;冻胀率低于5%时,冻胀对结构的最小主应力的影响不大,结构开裂后冻胀对结构最小主应力的影响显著;V级围岩隧道储水空洞向围岩侧的冻胀变形大于向衬砌侧的变形,且冻胀率越小,向围岩侧变形量的占比越大。在寒区隧道的设计和施工中要充分重视衬砌背后空洞的处置,衬砌和围岩紧密贴合可有效减弱衬砌背后积水冻胀压力。The freezing expansion of fissure water in the surrounding rock of tunnels in high altitude cold regions will have an important impact on the safety of tunnel structures.Based on the frost heaving theory of ponding behind the tunnel lining in cold regions,the stratum-structure model ofhighway tunnel in high altitude cold regions was established.The evolution of the interaction between surrounding rock and supporting structure during the frost heaving process of ponding behind the tunnel lining were studied,and the influence of water storage frost heaving in cavity on the stress distribution and structural deformation of the lining under different frost heaving rates were analyzed.Research results were concluded as follows.The maximum principal stress of the lining increases with the increase of frost heaving rate and reaches the peak value when the frost heaving rate is 6%.When the frost heaving rate is lower than 5%,the frost heaving has little influence on the minimum principal stress of the structure,and the frost heaving after the structure cracking has significant influence on the minimum principal stress.For a tunnel in class V surrounding rock,the frost heaving deformation of the water storage cavity towards the surrounding rock side is greater than that towards the lining side,and the smaller the frost heaving rate is,the greater the proportion of deformation towards the wall rock side is.In the design and construction of tunnels in cold regions,full attention should be paid to the treatment of cavities behind the lining.The close connection between the lining and surrounding rock can effectively reduce the frost heaving pressure of ponding behind the tunnel lining.

关 键 词：寒区隧道 积水冻胀 冻胀率 受力特征 

分 类 号：U451[建筑科学—桥梁与隧道工程]