软土地基一维非单调压缩固结性状分析

针对储油罐等结构物在使用期内常对下部地基产生往复性变化荷载等实际情况，考虑土体在加载和卸载时压缩系数不同的特性，研究了软土地基一维非单调压缩固结问题.基于现有的成层地基一維线性固结解析理论，采用半解析法求解，得到了相应的半解析解并编制了计算程序.通过系列计算和分析对比，全面地研究了当考虑和不考虑非单调压缩因素时，软土地基固结性状的区别以及不同参数对非单调压缩固结性状的影响.结果表明，压缩系数比、荷载比和卸载速率等对地基的固结均有显著影响；在考虑了非单调压缩的影响因素后，软土地基中超静孔压的消散将滞后于沉降的发展.

One-dimensional consolidation behavior of soft soil under non-monotonic compression

Aiming at the problem that soft soil beneath some structures such as oil storage often suffers from cyclic loading, the one-dimensional consolidation of soft soil under non-monotonic compression was studied considering different compressibility coefficients of soil under loading and unloading. The semi-analytical method was used to solve the consolidation problem based on the available analytical theory for one-dimensional linear consolidation of layered soils, and the semi-analytical solution was obtained and the corresponding computer code was developed. The difference of consolidation behavior between with and without non-monotonic compression characteristics and the influence of different factors on non-monotonic compression consolidation behavior were systematically studied. The influences of compressibility ratio, load ratio and unloading rate are all significant to the consolidation behavior. Considering the non-monotonic compression characteristics, the development of settlement will be quicker than the dissipation of excess pore water pressure.