摘要
为研究考虑寒区隧道冻缩型围岩和衬砌冻结变形作用下的隧道冻结压力,通过室内试验获得饱水岩石的冻结变形规律及不同温度下的冻缩线应变,使用解析法得到寒区隧道围岩冻缩压力的弹性解,并进行了算例分析、数值对比验证,采用控制变量法分析不同参数的影响规律。结果表明:不同冻结温度下饱水凝灰岩和砂岩均发生整体冻缩变形,但饱水砂岩冻缩过程中发生一定冻胀恢复,孔隙率大小是饱水岩石是否发生冻胀恢复的主要因素;不同围岩类型和低温混凝土冻结变形作用下寒区隧道围岩压力的理论计算和数值模拟结果基本相同,冻缩围岩压力的理论解具有良好的可靠性;寒区隧道衬砌表面的冻缩围岩压力随围岩最大冻结深度呈指数型增大,随围岩冻缩线应变、冻岩与未冻岩弹模之比的增大而线性增大。研究成果可为类似寒区隧道的抗冻设计提供一定的理论指导。
To investigate the freezing pressure in tunnels subjected to the frost deformation of frost-shrinkage surrounding rock and lining in cold regions,laboratory tests were conducted to determine the frost deformation behavior of water-saturated rocks and their frost-shrinkage linear strain at various temperatures.The elastic solution for frost-shrinkage pressure of the surrounding rock was derived analytically.Case analysis and numerical comparison validation were performed,and the control variable method was used to analyze the effects of different parameters.The research shows that:Water-saturated tuff and sandstone exhibit overall frost-shrinkage deformation under different freezing temperature conditions.Notably,water-saturated sandstone demonstrates some frost-heave recovery during the freezing and shrinking process,with porosity being the key factor influencing this recovery.The results of theoretical calculations and numerical simulations for surrounding rock pressure in cold region tunnels in various types of rock and under low-temperature concrete frost deformation are consistent,demonstrating the reliability of the theoretical solution.The frost-shrinkage surrounding rock pressure in cold region tunnels increases exponentially with the maximum freezing depth of the surrounding rock and increases linearly with the increase of the frost-shrinkage linear strain of the surrounding rock and the ratio of the elastic modulus of the frozen rock to the unfrozen rock.The proposed frost-shrinkage surrounding rock pressure solution in cold regions of tunnels can provide certain theoretical guidance for the frost resistance design of similar tunnels in cold regions.
作者
陈维
曹善鹏
夏才初
郭阔
郭碧槐
Chen Wei;Cao Shanpeng;Xia Caichu;Guo Kuo;Guo Bihuai(Jilin Provincial Transportation Planning and Design Institute,Changchun 130021,P.R.China;School of Civil Engineering,Tongji University,Shanghai 200092,P.R.China;Institute of Rock Mechanics,Ningbo University,Ningbo,Zhejiang 315211,P.R.China;Ningbo Key Laboratory of Energy Geostructure,Ningbo,Zhejiang,315211,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第5期1525-1533,共9页
Chinese Journal of Underground Space and Engineering
基金
吉林省交通运输创新发展支撑(科技)项目(2021-1-5)
国家自然科学基金(5177080814)。
关键词
寒区隧道
冻缩型围岩
理论推演
围岩压力
数值验证
cold regions tunnel
frost-shrinkage surrounding rock
theoretical deduction
surrounding rock pressure
numerical validation
