循环温度场下分层地基能量桩传热及变形模拟分析

Simulation of heat transfer and deformation of energy pile in layered foundation under cyclic temperature field

能量桩在保证承载性能的同时满足上部建筑物的供暖制冷需求.有关能量桩的既往研究中桩周土大多为单一地基土,对分层地基情况下能量桩传热规律及变形特性研究较少.本文以实际工程为依托,采用ABAQUS有限元分析软件,模拟多次冷热循环工况下并联双U型埋管能量桩在分层地基中运行情况,对桩身换热规律以及温度传递对能量桩形变影响进行研究.结果表明,冷热循环工况下能量桩会产生逐渐累积的桩顶沉降,且沉降会随着冷热循环次数的增加持续加大.因此,在实际工程中应重点关注由温度导致的桩顶沉降对桩承载性能的影响.

The energy pile can guarantee the bearing capacity and satisfy the heating and cooling demand of the upper building.In the previous studies on energy piles,most of the soil around the pile is single foundation soil,and there are few studies on the heat transfer law and deformation characteristics of energy piles under the condition of stratified homogeneity.In this paper,based on the actual project,ABAQUS finite element analysis software is used to simulate the operation of parallel double U-shaped buried pipe energy pile in layered foundation under multiple cold and hot cycling conditions,and the heat transfer law of pile body and the influence of temperature transfer on the deformation of energy pile are studied.The results show that the pile tip settlement accumulates gradually under the cooling and heating cycles,and the settlement expands continuously with the increase of the cooling and heating cycles.Therefore,the influence of pile tip settlement caused by temperature on pile bearing performance should be paid more attention to in practical.