人工冻融条件下模型桩基竖向静荷载试验研究

Experimental study of model pile foundations under vertical static load in artificially frozen and thawed soils

在室内人工冻融条件下,对-7℃、-3℃以及上层融化的人工冻土模型桩基进行了静荷载试验。试验主要研究了不同冻结温度下冻土中单桩的桩顶位移-荷载关系、冻结过程中桩的竖向上拔位移、融化过程中桩的沉降位移以及荷载作用下桩身轴力分布情况。试验表明:冻融环境对桩的位移影响很大,不同温度对桩的承载力也有很大影响。对于冻土冻融区的桩基工程,应特别重视上层冻土融化时可能造成的工程问题。

Under artificial frozen and thawed soils,experiments about the property of model pile foundation under vertical dead loads in- 7℃,- 3℃ and partially thawed soils were conducted. This paper mainly studies the displacements of pile under freezing and thawing condition,the displacement-force relationship of pile head,axis direction force changing with depths and ultimate bearing capacity of the pile with thawing. The test demonstrates that frozen and thawed conditions have significant-effects on the displacement and bearing capacity of pile foundations. Therefore,it should pay more attention to damages of pile engineering in frozen and thawed zone.