Analysis of the OCR of soft clay in coastal areas based on field vane strength

被引：0
作者：
Gao Y. [1 ]
Chen Z. [2 ]
机构：
[1] Department of Geotechnical Engineering, Tongji University, Shanghai
[2] School of Civil Engineering, Shaoxing University, Shaoxing, 312000, Zhejiang
来源：
Chen, Zhongqing (Q_CHEN_YK@163.com) | 1600年 / Academia Sinica卷 / 36期
基金：
中国国家自然科学基金;
关键词：
Consolidation state; Field vane test(FVT); Over consolidation ratio; Soft clay; Soil mechanics; Undrained shear strength;
D O I：
10.13722/j.cnki.jrme.2017.0335
中图分类号：
学科分类号：
摘要：
The over consolidation ratio(OCR) is an important parameter to evaluate deformation and strength characteristics of soil. The consolidation states and formation mechanism of the soft clay were analyzed based on the field vane strength of soft clay at six coastal areas in Tianjin, Shanghai, Lianyungang, Shenzhen, Zhongshan and Zhuhai. It was found that the OCR obtained from the field vane tests(FVT) was much larger than that obtained from the one-dimensional compression tests in laboratory and that the laboratory tests significantly underestimated the OCR of these soft clays. The variations of OCR with depth for these six areas are very similar and the OCR decreases to a stable value at a certain depth. The shallow soil shows over consolidation, but the deep soil shows some complexity. It was also found that Hanzawa and Tanaka's model can explain the formation mechanism of over consolidation and the variation of OCR with depth. The over consolidation of shallow soils originates mainly from the complex"surface effect" of cement or weathering, while the over consolidation of deep soil is due to the secondary compression. Considering the considerable sampling disturbance, this method based on FVT for evaluating OCR is worthy of recommendation for Chinese coastal areas. © 2017, Science Press. All right reserved.
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页码：2572 / 2579
页数：7
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