Technical Brief: Technical Briefs

A Simple Effective Stress Approach for Modeling Rate-Dependent Strength of Soft Clay

[+] Author and Article Information
Jiang Tao Yi

School of Civil Engineering,
Chongqing University,
No.83 Shabei Street,
Chongqing 400045, China
e-mail: yijt@foxmail.com

Yu Ping Li

Key Laboratory of Geomechanics
and Embankment Engineering,
Ministry of Education,
Hohai University;
Geotechnical Research Institute of Hohai University,
Hohai University,
Xi kang Road 1,
Nanjing 210098, China
e-mail: juliya-li@hotmail.com

Shan Bai

School of Civil Engineering,
Chongqing University,
No.83 Shabei Street,
Chongqing 400045, China
e-mail: baishan.cqu@foxmail.com

Yong Fu

Department of Civil and Environmental Engineering,
National University of Singapore,
Blk E1A #07-03 1 Engineering Drive 2,
10 Kent Ridge Crescent,
Singapore 117576
e-mail: fuyong@u.nus.edu

Fook Hou Lee

Department of Civil and Environmental Engineering,
National University of Singapore,
Blk E1A #07-03 1 Engineering Drive 2,
10 Kent Ridge Crescent,
Singapore 117576
e-mail: leefookhou@nus.edu.sg

Xi Ying Zhang

American Bureau of Shipping,
ABS Plaza,
16855 Northchase Drive,
Houston, TX 77060
e-mail: xyzhang@eagle.org

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 30, 2016; final manuscript received November 3, 2017; published online January 9, 2018. Assoc. Editor: Lizhong Wang.

J. Offshore Mech. Arct. Eng 140(4), 044501 (Jan 09, 2018) (5 pages) Paper No: OMAE-16-1074; doi: 10.1115/1.4038732 History: Received June 30, 2016; Revised November 03, 2017

This paper proposes a simple effective stress method for modeling the strain rate-dependent strength behavior that is experienced by many fine-grained soils in offshore events when subjected to rapid, large strain, undrained shearing. The approach is based on correlating the size of the modified Cam-Clay yield locus with strain rate, i.e., yield locus enlarging or diminishing dependent on the strain rate. A viscometer-based method for evaluating the needed parameters for this approach is provided. The viscometer measurements showed that strain rate parameters are largely independent of water content and agree closely with data from a previous study. Numerical analysis of the annular simple shear situation induced by the viscometer shows remarkable agreement with the experimental data provided the remolding-induced strength degradation effect is accounted for. The proposed method allows offshore foundation installation processes such as dynamically installed offshore anchors, free-falling penetrometer, and submarine landslides to be more realistically analyzed through effective stress calculations.

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Grahic Jump Location
Fig. 1

Extending the modified Cam-Clay yield locus to reflect strain rate effect

Grahic Jump Location
Fig. 2

Viscometer (HAAKE RotoVisco 1): (a) its plate–plate sensor system

Grahic Jump Location
Fig. 3

Shear stress strength against shear strain rate for soil with 72% water content and 1.87 void ratio

Grahic Jump Location
Fig. 4

Shear stress strength against shear strain rate for soil with 74% water content and 1.92 void ratio

Grahic Jump Location
Fig. 5

Shear stress strength against shear strain rate for soil with 83% water content and 2.16 void ratio

Grahic Jump Location
Fig. 6

Shear stress strength against shear strain rate for soil with 87% water content and 2.26 void ratio

Grahic Jump Location
Fig. 7

Normalized shear stress versus shear strain rate datafor soil of various liquidity index (IL) with a reference shear strain rate γ˙ref of 1 s−1 (sur,ref is the shear strength at reference shear strain rate γ˙ref)

Grahic Jump Location
Fig. 8

The calculated and measured shear strength versus shear strain rate data for soil with 83% water content




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