堆载-电渗联合作用下的一维非线性大变形固结理论

堆载-电渗联合作用下的软土地基加固属于大变形固结问题。该文在Esrig电渗固结理论的基础上，建立了拉格朗日坐标下以超静孔压作为变量的一维非线性大变形固结理论方程，推导出相应的超静孔压、沉降、平均固结度和孔隙比的解析公式，且通过了模型试验的验证。之后，采用该解分析了土体在堆载-电渗联合作用下的地基大变形固结特性，且与Esrig小变形固结解析解进行对比。结果表明:堆载-电渗联合作用下，考虑大变形的计算结果更符合工程实际，且此解可用于对大变形固结问题数值解法的验证。

A CONSOLIDATION THEORY FOR ONE-DIMENSIONAL LARGE DEFORMATION PROBLEMS UNDER COMBINED ACTION OF LOAD AND ELECTROOSMOSIS

The reinforcement of soft foundation by load and electroosmosis was a challenge involving large deformation consolidation. In this paper, a one-dimensional nonlinear large deformation consolidation theory in terms of excess pore-water pressure was derived in Lagrangian coordinate on the basis of Esrig#x02019;s consolidation theory. Then the corresponding analytical solutions for excess pore-water pressure, settlement, average degree of consolidation and void ratio were obtained. The behavior of one-dimensional nonlinear large deformation consolidation under action of load and electroosmosis was studied and compared with that analyzed by the Esrig#x02019;s consolidation theory. It is shown that the presented theory is more appropriate for practice and its analytical solution may be used to verify other numerical solutions of the large deformation consolidation problems under the combined action of load and electroosmosis.