控制基质吸力的非饱和粉质粘土固结试验研究

吴丽君; 蒋关鲁; 李安洪; 庞应刚

控制基质吸力的非饱和粉质粘土固结试验研究

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出版历程

Experiment research on consolidation tests of unsaturated silty clay under controlled matric suction

WULi-jun~,

摘要

摘要: 针对胶济客运专线非饱和原状粉质粘土,在控制基质吸力条件下进行了K0固结试验和常基质吸力固结试验研究,得到了不同含水量土体的侧压力系数,并在此基础上进行常基质吸力固结试验,通过分级施加围压和上覆应力对现场应力状态进行模拟,得到原状粉质粘土的水土特征曲线,进而探讨了非饱和粉质粘土的水土特性及体变规律。试验结果表明:不同含水量的非饱和土体侧压力系数不同,并且侧压力系数随含水量的增加而增加;非饱和原状粉质粘土的进气值约25kPa;土体饱和度对固结时间的影响显著,非饱和粉质粘土的固结速度随着饱和度的增加而减小。
- 非饱和粉质粘土 /
- 水土特征曲线 /
- 基质吸力
Abstract: K0-consolidation tests and consolidation tests under constant matric suction were performed on unsaturated undisturbed silty clay along Jiaozhou-Jinan railway line.K0-consolidation tests were carried out to get lateral coefficients of soil pressure in different water contents.Then consolidation tests under constant matric suction were performed through simulating graded confining pressures and overburden loading,and getting soil-water characters curve.We discussed on the soil-water characters and volume transformation rules of unsaturated silty clay.The main conclusions were obtained as follows: lateral coefficients of unsaturated silty clay are fluctuated from 0.51 to 0.61,and varie with water contents;the air entry value of unsaturated undisturbed silty clay is about 25kPa;saturation degree influences consolidation time strongly,and the higher saturation degree the longer consolidation time of unsaturated silty clay.
- unsaturated silty clay /
- soil-water characters curve /
- matric suction