连云港软黏土的不排水强度试验研究

›› 2009, Vol. 30 ›› Issue (11): 3297-3301.

连云港软黏土的不排水强度试验研究

殷杰¹, ²，高玉峰¹, ²，洪振舜³

1. 河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098；2. 河海大学岩土工程研究所，南京 210098； 3. 东南大学交通学院岩土工程研究所，南京 210096

收稿日期:2009-05-05 出版日期:2009-11-10 发布日期:2010-01-07
作者简介:殷杰，男，1982年生，博士研究生，主要从事软土结构性的研究。
基金资助:
国家自然科学基金资助项目（No. 50878050）。

Research on undrained shear strength tests of soft Lianyungang clay

YIN Jie¹, ²，GAO Yu-feng¹, ²，HONG Zhen-shun³

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China

Received:2009-05-05 Online:2009-11-10 Published:2010-01-07

摘要/Abstract

摘要：

对连云港软黏土不扰动样和重塑样进行三轴CU对比试验研究。结果表明，不扰动样的不排水强度包线是由以屈服压力为界的双折线组成，而重塑样的不排水强度包线可以用通过圆点的直线表示。屈服前阶段，不扰动样由于受结构性影响产生的抵抗作用，其不排水强度包线高于重塑样；屈服后阶段，不扰动样的不排水强度包线介于具有不同初始含水率的重塑样的包线之间。通过对比分析，发现不扰动样与重塑样的不排水强度包线存在差异的主要原因是由于试样的不同初始含水率引起的。不扰动样在屈服后阶段的含水率变化规律与不排水强度增长规律与重塑土相一致，采用Burland提出的孔隙指数Iv，可将不同初始含水率重塑样及屈服后阶段不扰动样的压缩性状较好地归一化。

关键词: 不扰动样, 重塑样, 不排水强度, 初始含水率

Abstract:

Triaxial consolidation undrained shear tests were performed on both undisturbed and remolded samples of soft Lianyungang clay to investigate its undrained shear strength behavior. The test results indicated that the strength envelope of the undisturbed sample is composed by two straight lines separated by the triaxial consolidation yield stress. The strength envelopes of remolded samples, however, are straight lines through the origin. When the applied confining stress is less than the triaxial consolidation yield stress (i.e. pre-yield stress state), undrained shear strength of undisturbed samples are larger than remolded samples due to the resistance of soil structure. While at post-yield state (the applied confining stress is larger than the triaxial consolidation yield stress), strength envelope of the undisturbed sample lies among the remolded samples with different initial water contents. This difference is found to be caused by the difference in initial water content. The changing in water content and strength with confining stress for undisturbed sample at post-yield state behave like as a remolded sample at given initial water content. The compression behavior of undisturbed sample at post-yield state or remolded samples of different initial water contents can be well normalized by the void index proposed by Burland.

Key words: undisturbed samples, remolded samples, undrained shear strength, initial water content

中图分类号:

TU411

殷杰，高玉峰，洪振舜. 连云港软黏土的不排水强度试验研究[J]. , 2009, 30(11): 3297-3301.

YIN Jie，GAO Yu-feng，HONG Zhen-shun. Research on undrained shear strength tests of soft Lianyungang clay[J]. , 2009, 30(11): 3297-3301.

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