中文摘要：

设计竖井地基热排水固结模型试验系统,选取宁波软黏土在水热循环温度70℃下开展热排水固结模型试验,分析了无堆载加热、分级堆载、恒载降温阶段各测点的温度、孔隙水压力及地表沉降变化规律,并以试验为原型,利用COMSOL软件建立热排水固结耦合模型,进行了有限元模拟分析。结果表明：模拟结果与试验结果可以相互验证;无堆载加热阶段,土体孔隙水压力先增大后消散,地表沉降先隆起后下沉,地基发生固结压缩;分级堆载阶段,耦合模型地基固结速率较退化模型快,地基平均固结度到达90%时,耦合模型所用时间较退化模型显著减少;恒载降温阶段,降温能使残余孔压快速消散,土体有效应力增加,土体沉降继续增大,地基进一步固结压缩。

英文摘要：

A model test system is designed for thermal shaft drainage consolidation,and test of thermal drainage consolidation is carried out by selecting soft clay in the Ningbo area under the hydrothermal fluid circulation temperature of 70℃. Change in temperature and pore-pressure of each measuring points and ground surface settlement are analyzed for the heating（ no load）,step loading and cooling（ constant load）stages. Taking the test as prototype,the thermal drainage consolidation coupling model is established by using the COMSOL software,and the finite element simulation is carried out. The results show that the simulation results and the test results can be verified with each other. For the heating stage,pore-pressure first increases and then dissipates,ground surface subsidence uplifts before sinking,and the consolidation of foundation happens. For the step loading stage,the rate of consolidation of the coupling model is faster than that of the degradation model,and the time of the coupling model is significantly less than that of the degradation model when the average consolidation of foundation is 90%. For the cooling stage,cooling can make the residual pore-pressure dissipate quickly and the effective stress increases,as a result,the ground surface settlement continues to increase,and the consolidation of foundation further develops.