基于水热耦合的寒区隧道仰坡稳定性研究  

Seismic Stability of Tunnel Slope in Cold Region Under DifferentFreeze-Thaw State

作　　者：李思悦 刘志强[1] LI Siyue;LIU Zhiqiang(Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学,甘肃兰州730070

出　　处：《河南科技》2024年第10期50-54,共5页Henan Science and Technology

基　　金：国家自然科学基金项目“典型寒区隧道洞门结构在冻融循环下的力学特征及冻害防治技术研究”(41761015)。

摘　　要：【目的】研究我国西北部寒冷地区的隧道仰坡稳定性及其季节温度效应的变化规律。【方法】建立寒区隧道仰坡的水热全耦合数学模型,以冻融环境变化为模拟分析基础,对其水热环境和稳定性进行数值模拟计算。【结果】结果表明,寒区隧道仰坡稳定性与土体冻融状态相关;临空面土体受环境温度影响较为明显,而内侧土温变化不显著。【结论】当温度降低,土体冻结层厚度增加时,仰坡稳定性表现较好;气温回暖季节冻融层融化,仰坡破坏滑移面几乎与坡面平行并向上延伸,极易发生滑塌灾害。[Purposes]This paper aims to study the stability of the side slope of the tunnel entrance in the cold region of Northwest China and the variation of its seasonal temperature effect.A fully coupled math-ematical model of water and heat of the tunnel slope in the cold region was established.[Methods]Based on the simulation analysis of the change of freeze-thaw environment,the numerical simulation of its wa-ter and heat environment and stability was carried out.[Findings]The results show that the stability of the tunnel slope in the cold region is related to the freeze-thaw state of the soil.The free surface soil is obviously affected by the ambient temperature,while the inner soil temperature does not change signifi-cantly.[Conclusions]When the temperature decreases,the thickness of the frozen layer of the soil in-creases,and the stability of the slope is better.In the warm season,the freeze-thaw layer melts,and the failure slip surface of the uphill slope extends almost parallel to the slope surface,which is prone to slump disaster.

关 键 词：寒区隧道仰坡 冻-融状态 水-热耦合数值模拟 边坡稳定性 

分 类 号：TU42[建筑科学—岩土工程]