岩土力学2017，Vol.38Issue(9)：2523-2530,8.DOI:10.16285/j.rsm.2017.09.008
上海软黏土的孔径分布试验研究
Experimental study of pore-size distribution of Shanghai soft clay
摘要
Abstract
To study the effect of soil structure on deformation characteristics,a series of odometer and mercury intrusion porosimetry tests on undisturbed,remolded,reconstituted and compacted samples of Shanghai soft clay,was carried out to obtain the compression curves and the pore-size distributions (PSD) of samples.The test results show that consolidation pressures and sample preparations have important influence on the PSD curves,and the PSD of undisturbed sample of Shanghai soft clay exhibits a unimodal shape,with a pore-size mainly ranging from 0.01 to 1.0 μm.The unimodal PSD of undisturbed sample is greatly influenced by soil structure.Large and medium interparticle pores are compressed into the small interparticle pores with increasing consolidation pressures,particularly under the consolidation pressure larger than the structural yield stress.The unimodal PSD also was found in saturated soft clay,no matter undisturbed,remolded,reconstituted or compacted samples.However,the PSD curves of samples using different sample preparation methods are different.The compacted samples have larger pore size and the reconstituted samples generate uniform pore size.The differences of micro-pore structure among different samples will be reduced with increasing consolidation pressure,yet never eliminated even at large consolidation pressure.Lastly,the reference void ratio,i.e.,a simple expression of clay fabric,is used to normalized the compression curves of the samples with different preparation.Different compression curves of four types' samples are normalized to a high correlative unified compression curve,which shows that the reference void ratio is a reasonable and effective parameter to illustrate the PSD of clay.关键词
上海软黏土/压汞试验/孔径分布/结构性/参考孔隙比Key words
Shanghai soft clay/mercury intrusion porosimetry/pore-size distribution/soil structure/reference void ratio分类
建筑与水利引用本文复制引用
陈波,孙德安,高游,李健..上海软黏土的孔径分布试验研究[J].岩土力学,2017,38(9):2523-2530,8.基金项目
国家自然科学基金(No.41402271) （No.41402271）
衢州市科技计划项目(No,2014Y012) （No,2014Y012）
衢州学院中青年学术骨干培养基金(No.XNZQN201514).This work was supported by the National Natural Science Foundation of China (41402271),the Science and Technology Planning Project of Quzhou (2014Y012) and the Academic Backbone Training Fund for Young and Middle-aged Teacher of Quzhou University (XNZQN201514). （No.XNZQN201514）
