Experimental Study on Tensile Strength of Frozen Soil-concrete Interface in Open System
In pile foundation engineering in cold regions,the strength of frozen soil-concrete interface has an important influence on the stress state of pile foundation.The tensile strength orthogonal test of the frozen soil-concrete interface zone was carried out under the condition of open system.The range analysis of variance method was used to clarify the primary and secondary order of the influence of four test factors,namely interface roughness,soil moisture content,test temperature and dry density,on the frozen tensile strength of the interface.The test results show that the increase of soil moisture content,the decrease of test temperature and the increase of contact surface roughness can continuously improve the frozen tensile strength of the interface.There is a critical moisture content in the soil sample.When the moisture content is located on both sides of the critical moisture content,the rough-ness of the contact surface changes to different degrees due to the ice film formed by the water migra-tion,which leads to different laws in the impact of the increase in contact surface roughness on the increase in frozen tensile strength of the interface.
frozen soil-concrete interfacefrozen tensile strengthopen systemmoisture migrationorthogonal test
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维普
