长春地区季节性冻土冻融作用下的力学性质研究

Mechanical Properties by Frozen-thaw of Seasonal Frozen Soil in Changchun Area

为研究长春地区季节性冻土在冻融循环作用下土体力学参数的变化,通过对典型地层现场采取原状土样进行室内试验的方法,在试验室内完成原状土、一次冻融土、二次冻融土等三种不同状态下土样的物理力学参数测试,对三种不同状态下土样的主要物理力学参数进行对比分析,得到土体在二次冻融循环作用下力学参数的变化规律,同时对土样在二次冻融循环下的的冻胀及融沉性进行了试验,对影响地基土土体冻胀性及融沉性的主要因素进行了详细分析,并针对其影响因素提出相应的冻害防治措施建议。

The change of soil mechanical parameters of seasonal frozen soil under freezing and thawing cycles in Changchun area is studied.Soil samples were taken from typical soil layers and tested in the laboratory.The physical and mechanical parameters of soil samples under three different conditions,namely undisturbed soil,primary frost-thaw soil and secondary frozen-thaw soil,had been tested,compared and analyzed.The variation law of mechanical parameters under the action of the second frozen-thaw cycle were concluded.The frost heave and thaw settlement under the action of the second frozen-thaw cycle were also tested,and the main factors affecting the frost heave of foundation soil were analyzed in detail.The corresponding prevention and control measures were put forward according to the influencing factors.