The observations on compressibility of reconstituted clays show that the compression line with a higher initial water content lies above the compression line with a lower initial water content for a given clay. Hence ...The observations on compressibility of reconstituted clays show that the compression line with a higher initial water content lies above the compression line with a lower initial water content for a given clay. Hence there exists additional void ratio due to initial water contents among virgin compression lines（VCLs） of reconstituted clays. In this paper, the difference in void ratio caused by different initial water contents is investigated based on the empirical equation proposed by Liu and Carter（2000） for describing the differential void ratio at the same stress between natural and reconstituted clays. The mechanism of compressibility of reconstituted clays, when the stress level is larger than the remolded yield stress, is also discussed.展开更多
Evaluating the impacts of soil structure on mechanical behavior for natural sedimentary clays is an important issue in geotechnical engineering. Burland introduced void index for normalizing the compression curves of ...Evaluating the impacts of soil structure on mechanical behavior for natural sedimentary clays is an important issue in geotechnical engineering. Burland introduced void index for normalizing the compression curves of various remolded and reconstituted clays to obtain the intrinsic compression line, which provides a reference framework to assess the in-situ compression behavior. However, it does not quantitatively account for the effects of initial water content on compressive behavior of remolded and reconstituted clays and the initial water contents of clays are not always limited to 1.0 - 1.5 times the liquid limits defined by Burland. A modification based on collected tests data was presented on the expressions of ?and ?defined by Burland. Extensive oedometer test data were also collected on various remolded and reconstituted soils with distinct liquid limits and initial water contents to verify the validity of modified expressions. A normalized compression line deduced by intrinsic compression line is proposed in the e-log p plot, which can be used to evaluate the effects of soil structure quantitatively on the intact compressive behavior for natural sedimentary clays.展开更多
通过对不同初始含水率的盐城港滨海港区高含水率淤泥开展压缩试验,探讨初始含水率对滨海港淤泥压缩特性的影响。试验结果显示,滨海港淤泥的e^lgp曲线呈反"S"形,采用孔隙指数Iv可以较好的归一化固结压力大于100 k Pa时的压缩...通过对不同初始含水率的盐城港滨海港区高含水率淤泥开展压缩试验,探讨初始含水率对滨海港淤泥压缩特性的影响。试验结果显示,滨海港淤泥的e^lgp曲线呈反"S"形,采用孔隙指数Iv可以较好的归一化固结压力大于100 k Pa时的压缩曲线。孔隙比、e*100、C*c等均随初始含水率的增加而增加,重塑屈服应力随初始含水率的增加而降低。此外,试验结果还表明,现有关于黏土的重塑屈服应力、e*100、C*c的预测公式不适用于滨海港淤泥,实测的重塑屈服应力大于现有预测公式的预测值,而实测的e*100、C*c小于现有预测公式的预测值。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.41502263,41372309 and 41330641)the National Key Basic Research Program of China(973 Program,Grant No.2015CB057803)+1 种基金the Natural Science Foundation of Jiangsu Province(Grant No.BK20150819)the Fundamental Research Funds for the Central Universities of China in support of this study is also gratefully acknowledged
文摘The observations on compressibility of reconstituted clays show that the compression line with a higher initial water content lies above the compression line with a lower initial water content for a given clay. Hence there exists additional void ratio due to initial water contents among virgin compression lines（VCLs） of reconstituted clays. In this paper, the difference in void ratio caused by different initial water contents is investigated based on the empirical equation proposed by Liu and Carter（2000） for describing the differential void ratio at the same stress between natural and reconstituted clays. The mechanism of compressibility of reconstituted clays, when the stress level is larger than the remolded yield stress, is also discussed.
文摘Evaluating the impacts of soil structure on mechanical behavior for natural sedimentary clays is an important issue in geotechnical engineering. Burland introduced void index for normalizing the compression curves of various remolded and reconstituted clays to obtain the intrinsic compression line, which provides a reference framework to assess the in-situ compression behavior. However, it does not quantitatively account for the effects of initial water content on compressive behavior of remolded and reconstituted clays and the initial water contents of clays are not always limited to 1.0 - 1.5 times the liquid limits defined by Burland. A modification based on collected tests data was presented on the expressions of ?and ?defined by Burland. Extensive oedometer test data were also collected on various remolded and reconstituted soils with distinct liquid limits and initial water contents to verify the validity of modified expressions. A normalized compression line deduced by intrinsic compression line is proposed in the e-log p plot, which can be used to evaluate the effects of soil structure quantitatively on the intact compressive behavior for natural sedimentary clays.
文摘通过对不同初始含水率的盐城港滨海港区高含水率淤泥开展压缩试验,探讨初始含水率对滨海港淤泥压缩特性的影响。试验结果显示,滨海港淤泥的e^lgp曲线呈反"S"形,采用孔隙指数Iv可以较好的归一化固结压力大于100 k Pa时的压缩曲线。孔隙比、e*100、C*c等均随初始含水率的增加而增加,重塑屈服应力随初始含水率的增加而降低。此外,试验结果还表明,现有关于黏土的重塑屈服应力、e*100、C*c的预测公式不适用于滨海港淤泥,实测的重塑屈服应力大于现有预测公式的预测值,而实测的e*100、C*c小于现有预测公式的预测值。
