| 基于GDS的萧山黏土非线性压缩特性试验研究 |
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| 引用本文： | 齐添,谢康和,应宏伟,王坤.基于GDS的萧山黏土非线性压缩特性试验研究[J].科技通报,2007,23(5):723-728,735. |
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| 作者姓名： | 齐添 谢康和 应宏伟 王坤 |
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| 作者单位： | 浙江大学,软弱土与环境土工教育部重点实验室,杭州,310027 |
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| 基金项目： | 高等学校博士学科点专项科研项目;浙江省自然科学基金 |
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| 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。
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| 关 键 词： | 萧山黏土 GDS高级固结仪 孔隙比 压缩性 非线性 |
| 文章编号： | 1001-7119（2007）05-0723-06 |
| 收稿时间： | 2006-07-10 |
| 修稿时间： | 2006-07-10 |
Experimental Investigation on Nonlinear Compression Behavior of Xiaoshan Clay |
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| QI Tian,XIE Kang-he,YING Hong-wei,WANG Kun.Experimental Investigation on Nonlinear Compression Behavior of Xiaoshan Clay[J].Bulletin of Science and Technology,2007,23(5):723-728,735. |
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| Authors: | QI Tian XIE Kang-he YING Hong-wei WANG Kun |
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| Institution: | Key Laboratory of Soft Soils and Geoenuironmental Engineering Ministry of Education, Zhejiang University,Hangzhou 310027, China |
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| Abstract: | 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.It 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. |
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| Keywords: | xiaoshan clay GDS ADVCTS void ratio permeability nonlinearity |
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