结构性土一维非线性大应变固结半解析解

以结构性较强的天然饱和软黏土为研究对象，考虑了沉积作用对其自重应力的影响，以及压缩性和渗透性的非线性变化，推导了任意加载条件下结构性土一维大应变固结控制方程，并采用半解析的方法对方程进行求解计算。再将其退化为无结构性的饱和软黏土固结解，与已有的大应变固结解进行了对比，验证了该解的正确性。最后将该半解析解计算结果与小应变固结理论解、不考虑结构性的固结理论解计算结果进行对比分析。结果表明：大应变固结理论的沉降计算值大于小应变固结理论的计算值，且二者的差值随着荷载的增加而增加；当考虑土体的结构性时，地表沉降计算值小于不考虑土体结构性的沉降计算值。

Semi-analytical solutions for one-dimensional nonlinear large strain consolidation of structured soft clay

In the analysis of consolidation of naturally saturated soft clay with strong structure, the influence of sedimentation on self-weight stress, the nonlinear variation of compressibility and permeability were considered. The one-dimensional large strain consolidation equations under arbitrary loading conditions were derived and solved by a semi-analytical method. Then the solutions were degraded into solutions of a non-structured saturated soft clay consolidation theory. By comparing the degraded semi-analytical solutions with the existing large strain consolidation solutions, the solutions of the one-dimensional large strain consolidation equations were proved to be right. At last, the consolidation behaviours of semi-analytical solutions were compared with the theoretical solutions of small strain consolidation theory and the the theoretical solution of the consolidation theory without considering the structure. The comparison results show that the settlement at any time of large strain consolidation theory is greater than that of the small strain consolidation theory, and the difference between the two increases with the increase of the load. When considering the structure of the soft soil, the settlement of large strain consolidation is smaller than the calculated value without considering the soil structure.