Study On Consolidation Of Saturated Soil With Internal Heat Sources Considering Permeability Anisotropy

In this paper,on the basis of reviewing in detail and summarizing from the research status of heat consolidation problem of soil,the corresponding control equations of stress field,seepage field and temperature field were deduced by considering the soil consolidation theory,the thermal elastic theory,seepage theory and heat transfer theory,one-dimensional thermal consolidation equation considering heat source and two-dimensional thermal consolidation equation considering the soil permeability anisotropy of isotropic saturated soil were established and the analytical solution of the equation under different definite conditions were discussed.In addition,it can make up for the inadequacy of experimental and theoretical difficulties with the aid of numerical analysis method,so the finite element simulation is used to explore the relevant regularity on the basis of theoretical analysis,and then judge the reliability of the analytical solution.The specific research contents are as follows:(1)In this paper,one-dimensional thermal consolidation model of saturated soil by considering the effect of the heat source inside was put forward.In according to the method of mathematical transformation,the consolidation problem of saturated soil with heat source was made a comprehensive analysis in view of two cases,which heat source was respectively constant and changed over time.(2)To expand one-dimensional problem to two-dimensional problem,two-dimensional thermal consolidation model under heat source was put forward with considering the characteristics of the coefficient of permeability anisotropy,which based on the linear elastic isotropic consolidation differential equation of saturated soil of two-dimensional plane.And then find the solution by separate variable method.Finally,according to the calculation procedure by myself,the influence of existence and changes of heat source and the changes of coefficient of permeability in x and z direction on the heat consolidation of soil were analyzed.(3)Respectively by using ABAQUS finite element software,the calculation model of the soil under the two-dimensional plane and three-dimensional space were established,and then respectively discussed the influence of heat source on soil consolidation process.In addition,the change of the heat source and the characteristics of transverse isotropic and isotropic of permeability coefficient were also compared.The study of the thermal consolidation of saturated soil was further more.The final analysis results show that the surrounding temperature of deep soil,pore water pressure and displacement changes have great influence when considering heat source,but to a certain extent,the size of influence will vary by the change of heat source intensity,permeability coefficient ratio of two direction and other factors.From the results of numerical simulation analysis,the temperature field have a certain influence on the stress field and seepage field,especially the surrounding soil temperature changes has a lot relation with soil settlement and displacement under the effect of heat source for a long time.