摘要
为深入研究地铁浅埋人工冻土的冻胀特性,以江苏某项目部地铁隧道盾构法施工土样为研究对象,进行人工冻结试验,包括常规土工试验、导热系数试验、三轴剪切强度试验和冻胀试验.数据分析表明:冻结情况下,砂质黏土和钙质黏土的导热系数增大、抗剪强度随围压的增加而增大,两种黏土类型的冻胀率与冻胀力随时间的变化相似,呈非线性增长,可分为强增期、弱增期和稳定期.对冻胀率和冻胀力随时间的变化规律采用2种指数模型进行曲线拟合,拟合精度均在0.98以上.
In order to deeply study the frost heaving characteristics of subway shallow buried artificial frozen soil,the soil sample of subway tunnel shield construction of a project department in Jiangsu was took as the research object and the artificial freezing test was carried out,including conventional geotechnical test,thermal conductivity test,triaxial shear strength test and frost heaving test.The data analysis shows that under freezing,the thermal conductivity and shear strength of sandy clay and calcareous clay increase with the increase of confining pressure.The variation of frost heaving rate and frost heaving force of the two clay types with time is similar and increases nonlinearly,and it can be divided into strong increase period,weak increase period and stable period.Two exponential models were used to fit the curve of the variation law of frost heaving rate and frost heaving force with time,and the fitting accuracy is more than 0.98.
作者
苏恒宇
姚文杰
年立辉
SU Hengyu;YAO Wenjie;NIAN Lihui(School of Construction Management,Jiangsu Vocational Institute of Architecture lechnology,Xuzhou Jiangsu 221116,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and lechnology,Xuzhou Jiangsu 221116,China)
出处
《江苏建筑职业技术学院学报》
2021年第4期16-19,共4页
Journal Of Jiangsu Vocational Institute of Architectural Technology
基金
2020江苏建筑职业技术学院校级科研课题:动静组合加载下人工冻土物理力学性质及冻胀演变特性研究(JYQZ20-03)
江苏省建设系统科技项目:基于BIM相关信息技术的建设项目安全风险管理平台设计与研究(2020ZD27)
2020江苏高校“青蓝团队”优秀教学团队培养对象项目。
关键词
冻土
导热系数
抗剪强度
冻胀率
冻胀力
frozen soil
thermal conductivity
shear strength
frost heaving rate
frost heaving force
