期刊
MARINE GEORESOURCES & GEOTECHNOLOGY
卷 38, 期 5, 页码 570-582出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/1064119X.2019.1604917
关键词
Undisturbed specimen; reconstituted specimen; strength; pore-size distribution; soil structure; reference void ratio
资金
- Public Welfare Technology Research Projects of Zhejiang Province [LGG18D020001, LGG19E080002]
- National Natural Science Foundation of China [41402271]
- China Scholarship Council [201808330219]
The effect of microstructure on shear strength of saturated marine clays was investigated by conducting a series of consolidated-drained (CD), consolidated-undrained (CU) triaxial shear tests and mercury intrusion porosimetry (MIP) tests on undisturbed and reconstitute specimens. The valuable findings from the experimental study are follows: (1) The shear strength of undisturbed specimens is lower than that of corresponding reconstituted specimens due to larger void ratio at the same confining pressure. However, undisturbed specimens have higher strength than reconstituted specimens when their void ratios are the same. (2) The main reason for the lower shear strength of reconstituted specimens with the same void ratio as undisturbed specimens is that more volume of inter-aggregate pores exists in the reconstituted specimens according to the MIP test results. And the difference in shear strength between undisturbed and reconstituted specimens is mainly caused by the difference in soil fabric. (3) The shear test results dealt with a reference void ratio, as a fabric index, show that there is a unique linear relation between strength and void ratio at failure to the reference void ratio. Moreover, the linear relation is suitable for other marine clays from the literature. Therefore, the reference void ratio can be used as a soil fabric index to normalize the strength characteristics of marine soft clays.
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