摘要
总结反映黏土孔隙比随固结压力的变化规律的e-logp模型,Ec-p模型,log(e+ec)-logp模型等3种非线性压缩模型的基础上,提出了考虑先期固结压力影响的log(e+ec)-log(p-pc)压缩模型。利用GDS高级固结仪对萧山原状黏土的7个试样进行了分级加载固结试验,整理固结压力与孔隙比等试验数据,分别确定了4种压缩模型的土性参数。试验与分析结果表明传统固结理论用黏土压缩系数av1-2代替变化值av,降低计算精度,且不能反映黏土的非线性压缩规律;大变形与小变形确定的孔隙比e数值上基本相同;从拟合结果与实用角度出发,选取ec=1的log(e+ec)-logp与log(e+ec)-log(p-pc)压缩模型最适用于描述萧山黏土的非线性压缩特性。
Three nonlinear compression models i.e. e-logp Model, Ec-p Model, and log（e＋ec）-logp Model were discussed, and the new log（e＋ec）-log（p-pc） model was further introduced. The 1-D confined consolidation tests on seven undisturbed Xiaoshan clay samples were carried out by GDS Advanced Consolidation Testing System. Void ratio and consolidation pressure obtained from the test results were analyzed to summarize clay parameters of three compression models. Experimental results showed that void ratio of Xiaoshan clay decreases nonlinearly with consolidation pressure increasing,and the compression coefficient av1-2 substituted for varied value av in the traditional consolidation theory was not exact. The values of void ratio using the small-strain theory and infinite-strain theory were almost the same.h was also found that log （e＋ec）-logp or log（e＋ec）-log（p-pc） compression model （ec=1） was most suitable for describing the nonlinear compressibility of Xiaoshan clay.
出处
《科技通报》
2007年第5期723-728,735,共7页
Bulletin of Science and Technology
基金
教育部博士点专项基金资助项目(20030335027)
浙江省自然科学基金资助项目(Y104413Y104463)
