不同约束条件下土体冻胀规律  

Experiments on frost heave of artificial frozen soils with different constraints

作　　者：胡坤[1,2] 周国庆[2] 李晓俊[2] 陆勇[2] 

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《煤炭学报》2011年第10期1653-1658,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50534040;40471021);国家科技支撑计划资助项目(2006BAB16B01)

摘　　要：为研究不同约束条件下的土体冻胀规律,选取冻胀敏感性粉质黏土,利用一维冻胀试验系统进行了自由边界、弹性约束、刚性约束条件下的冻胀试验,得出土体含水量、补水量、冻胀量、冻胀速率、冻胀力的变化规律及冻胀力与冻胀量之间的动态平衡关系。结果表明:随着约束阻尼系数的增加,土体主动区含水量、补水量、冻胀速率、冻胀量均减小,冻胀力增大;与自由边界条件相比,弹性约束条件下的冻胀量分别减少了19.6%、36.5%、61.2%;冻胀力分别为0.22、0.36、0.96 kN;冻胀力与冻胀量之间的拟合函数关系为f=4.633 7e-0.3128h,冻胀力随着冻胀量的增大呈指数规律衰减。In order to study on frost heave of artificial frozen soils with different constraints,experiments using frost susceptible silty clay were carried out by 1-D frost heaving test system in free boundary,elastic constraint and rigid constraint respectively.Variations of water contents,water intake,frost heave,frost heaving force were acquired and the dynamical equilibrium between frost heave and the corresponding force was established.The results show that with the increase of damping coefficient,water contents in active zone,water intake,frost heave and the corresponding velocity are all decreased,however,frost heaving force increased.Compare elastic constraint with free boundary condition,frost heave decrease by 19.6%,36.5% and 61.2%,frost heaving force are 0.22,0.36 and 0.96 kN respectively.The dynamical equilibrium between frost heave and the corresponding force is f=4.633 7e-0.312 8h,frost heaving force decreases exponentially with the increase of frost heave.

关 键 词：弹性约束 阻尼系数 刚性约束 冻胀量 冻胀力 

分 类 号：TU443[建筑科学—岩土工程]