考虑温度相关冻胀率的浅埋隧道冻结法施工地表变形计算  

Calculation of ground surface deformation induced by horizontal freezing during construction of shallow buried tunnel considering temperature-dependent frost heave ratio

作　　者：肖旻 李苗苗 王正中 刘俊伟[4] 江浩源[2] 吴浪 王则乐[1] XIAO Min;LI Miaomiao;WANG Zhengzhong;LIU Junwei;JIANG Haoyuan;WU Lang;WANG Zele(School of Civil Engineering,Jiangxi Science&Technology Normal University,Nanchang 330013,China;State Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;College of Water Resource and Architectural Engineering,Northwest A&F University,Yangling 712100,Shaanxi,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,Shandong,China)

机构地区：[1]江西科技师范大学土木工程学院,江西南昌330013 [2]中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程全国重点实验室,甘肃兰州730000 [3]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [4]青岛理工大学土木工程学院,山东青岛266520

出　　处：《冰川冻土》2025年第2期408-416,共9页Journal of Glaciology and Geocryology

基　　金：江西省教育厅科技项目(GJJ190621);冻土工程国家重点实验室开放基金项目(SKLFSE201801);中国博士后科学基金项目(2023M743746);国家资助博士后研究人员计划(GZC20232956);国家自然科学基金项目(42401174,U2003108);江西省大学生创新创业训练计划项目(S202311318048)资助。

摘　　要：地表冻胀变形是评估浅埋隧道水平冻结施工引起邻近既有结构力学响应的关键因素。现有研究无法合理考虑冻结壁不均匀温度场导致冻胀率的空间差异分布,为克服上述不足,结合随机介质理论和叠加原理,引入折算热膨胀系数的概念,在热弹性力学框架下提出了一种单圈管水平冻结施工引起地表冻胀变形分布的计算方法。结合工程实例,分别应用本文方法、传统方法、有限元法计算了单圈管冻结引起的地表变形分布,并与观测值进行对比分析,以表明本文所提方法的合理性与适用性。最后,分别探讨了冷媒介质温度、隧道中心埋深及冻结锋面扩展系数ε对水平冻结施工引起地表冻胀变形分布的影响规律。结果表明,冷媒介质温度越低,地表冻胀变形总体呈增大趋势,对隧道中心正上方土体变形影响显著;隧道埋置深度越大,最大地表冻胀变形减小,影响范围也逐渐减小;ε越大,最大地表冻胀变形及影响范围均增大,但增大幅度不明显。本研究可为浅埋隧道水平冻结施工技术在高风险地下工程领域的应用提供参考。With the rapid advancement of China’s economy and accelerating urbanization,the proportion of sub⁃ways in urban transportation networks is steadily increasing.The artificial ground freezing method is an essential construction technique for tunneling through soft,water-saturated soil layers.The frost heave-induced deforma⁃tion of the ground surface resulting from this method may adversely affect adjacent existing engineering struc⁃tures.In extreme scenarios,it could lead to significant economic losses and pose a threat to human safety.Therefore,considering the crucial factor of ground surface deformation caused by soil frost heave becomes im⁃perative during the horizontal freezing construction of shallow buried tunnels.The investigation into the redistribution of the soil layer displacement field induced by artificial ground freezing and its resulting ground surface uplift deformation has garnered significant attention among scholars;however,certain limitations are present.To overcome the limitation of previous studies that overlook the spatial variability in frost heave ratio resulting from a non-uniform temperature field,the article proposes an innovative methodology for quantifying ground surface deformation induced by frost heave during underground tunnel construction.The proposed method inte⁃grates the principles of superposition and the theory of random media within the framework of thermo-elasticity mechanics,utilizing the concept of an equivalent thermal expansion coefficient.The presented approach was em⁃ployed to calculate ground surface deformation induced by soil frost heave due to single-loop distribution freez⁃ing pipes,based on an engineering case study.The rationality and applicability of the presented method were demonstrated through a comparison with observed values.The calculation results obtained from this method demonstrate a markedly higher degree of agreement with the observed values compared to those achieved by con⁃ventional approaches and finite element method(FEM).Conve

关 键 词：隧道 人工冻结法 地表变形 随机介质理论 温度相关冻胀率 

分 类 号：TU94[建筑科学—建筑技术科学]