考虑软土流变特性和应力历史的一维固结与渗透试验

利用GDS先进固结试验系统对萧山软土进行了常规分级加载固结与渗透试验、分级加载流变固结与渗透试验、压缩－回弹－再压缩流变固结与渗透试验，绘制了沉降曲线、孔压消散曲线以及孔隙比和渗透系数的变化曲线，通过回归分析得到了萧山软土的压缩指数、回弹指数、渗透指数、次固结系数。试验结果表明：萧山软土具有明显的流变特性，对于正常固结萧山软土，土样底部超静孔压消散大约在加载后5个小时左右完成，而超固结土孔压消散速度比正常固结土快；应力历史和超固结比对次固结系数有显著的影响。

One dimensional consolidation and permeability tests considering stress history and rheological characteristic of soft soils

Several sets of 1-D consolidation and permeability tests considering stress history and rheological characteristic of soft soils are conducted by using GDS Advanced Consolidation Test System. A lot of curves have been presented, such as curves of settlement, pore water pressure, void ratio and coefficient of permeability, and some parameters of soft soils are derived by using curve fitting method. It is proved that rheological characteristic of Xiao-shan soft soils is remarkable. The time for pore water pressure dissipating completely is about 5 hours for normal consolidated soils, and the pore water pressure dissipating speed of overconsolidated soils is faster than normal consolidated soils. Stress history and OCR have obvious effects on the coefficient of secondary consolidation.