结构性对软黏土次固结特性影响的试验研究  

Influence of structure on secondary consolidation characteristics of soft clay

作　　者：应胜一 陈波[1,2] 许四法 金盼[2] YING Shengyi;CHEN Bo;XU Sifa;JIN Pan(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;College of Civil Engineering and Architecture,Quzhou University,Quzhou 324000,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023 [2]衢州学院建筑工程学院,浙江衢州324000

出　　处：《长沙理工大学学报（自然科学版）》2024年第3期35-43,共9页Journal of Changsha University of Science and Technology:Natural Science

基　　金：浙江省自然科学基金项目(LZY21D020001);衢州市重点科技攻关项目(2022K93、2023K220)。

摘　　要：【目的】分析软黏土原状样和重塑样次固结系数随固结压力的演化规律,比较不同试样的孔隙比和孔径分布曲线,探究结构性影响软黏土次固结特性的内在机理。【方法】对上海和温州软黏土的原状样和重塑样开展不同固结压力下的次固结试验及相同孔隙比下的压汞试验,得到试样在对应固结压力下的次固结系数及孔径分布曲线。【结果】原状样的次固结系数随固结压力的增大呈先增大后减小的变化规律,重塑样的次固结系数基本不受固结压力的影响。相同孔隙比下的原状样和重塑样在孔径分布上存在明显差异,而两者的次固结系数基本一致。但是,相同压力下的原状样和重塑样的次固结系数差值与孔隙比差值具有良好线性关系。【结论】固结压力对原状样次固结系数具有重要影响,但对重塑样次固结系数的影响可忽略不计。此外,相同压力下的原状样和重塑样的次固结系数差异,主要是结构性引起两种试样的孔隙比不同所致的,而孔隙结构对次固结系数的影响可忽略不计。[Purposes]This study aims to investigate the evolution laws of secondary consolidation coefficients of undisturbed and reconstituted specimens under different consolidation pressures,compare the void ratios and pore size distributions(PSDs)of different specimens,and explore the intrinsic mechanism of structure affecting secondary consolidation characteristics.[Methods]For undisturbed and reconstituted specimens from Shanghai and Wenzhou cities in China,secondary consolidation tests were conducted under different consolidation pressures and mercury intrusion porosimetry(MIP)tests were carried out at the same void ratio.The secondary consolidation coefficients and the PSDs were obtained from specimens under the corresponding consolidation pressures.[Findings]As the consolidation pressure increases,the secondary consolidation coefficient of undisturbed specimen initially increases and then decreases,while that of the reconstituted specimen is basically not affected.There is a significant difference in the PSDs of undisturbed and reconstituted specimens with the same void ratio,but their secondary consolidation coefficients are basically the same.However,for undisturbed and reconstituted specimens under the same pressure,a good linear relationship exists in the differences in secondary consolidation coefficients and void ratios.[Conclusions]The consolidation pressure has a great influence on the secondary consolidation coefficient of the undisturbed specimen,but a negligible influence on that of the reconstituted specimen.Moreover,the difference in secondary consolidation coefficients between undisturbed and reconstituted specimens under the same pressure is mainly caused by the difference in void ratios of the two different specimens due to the structural factors,and the influence of the PSDs on the secondary consolidation coefficient can be ignored.

关 键 词：软黏土 结构性 次固结系数 孔径分布 孔隙比 

分 类 号：TU443[建筑科学—岩土工程]