›› 2007, Vol. 28 ›› Issue (10): 2138-2144.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study on degradation of stiffness of saturated soft clay under undrained cyclic loading

WANG Jun1, CAI Yuan-qiang1,2, XU Chang-jie1   

  1. 1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. Architecture and Civil Engineering College, Wenzhou University, Wenzhou 325027, China
  • Received:2005-10-17 Online:2007-10-10 Published:2013-10-15

PDF (PC)

1431

Abstract: Degradation of stiffness and strength will occur in soft clay under cyclic loading because of the generation of pore pressure. Unfortunately, previous work rarely incorporated the effect of initial deviator stress on cyclic degradation behavior. In this paper, the degradation of stiffness characteristics of normally consolidated soft clay subjected to undrained cyclic triaxial loading are investigated at different numbers of cycles, different cyclic stress levels and different initial deviator stresses. The influence of these three factors on the shear stiffness is investigated by analyzing the secant shear modulus in each unload-reload loop. It’s observed that the stiffness reduced with progressive number of cycles. On the other hand, higher cyclic stress level and initial deviator stress accelerate the degradation of stiffness. A linear relationship is obtained if secant shear modulus is plotted against numbers of cycles on a semi-log scale. This relationship has been synthesized in the form of an empirical equation. The failure stiffness ration for Xiaoshan soft clay is obtained from the equation.

Key words: stiffness, degradation, cyclic loading, soft clay

CLC Number: 

  • TU 435
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
    • [1] WANG Chen-lin, ZHANG Xiao-dong, DU Zhi-gang, . Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading [J]. Rock and Soil Mechanics, 2019, 40(6): 2140-2153.
    [2] LUO Qing-zi, CHEN Xiao-ping, YUAN Bing-xiang, FENG De-luan, . Deformation behavior and consolidation model of soft soil under flexible lateral constraint [J]. Rock and Soil Mechanics, 2019, 40(6): 2264-2274.
    [3] ZHANG Zhi-guo, ZHANG Rui, HUANG Mao-song, GONG Jian-fei, . Optimization analysis of pile group foundation based on differential settlement control and axial stiffness under vertical loads [J]. Rock and Soil Mechanics, 2019, 40(6): 2354-2368.
    [4] XIA Tang-dai, ZHENG Qing-qing, CHEN Xiu-liang, . Predicting excess pore water pressure under cyclic loading with regular intervals based on cumulative dynamic deviator stress level [J]. Rock and Soil Mechanics, 2019, 40(4): 1483-1490.
    [5] ZHOU Hui, CHENG Guang-tan, ZHU Yong, CHEN Jun, LU Jing-jing, CUI Guo-jian, YANG Pin-qing, . Experimental study of shear deformation characteristics of marble dentate joints [J]. Rock and Soil Mechanics, 2019, 40(3): 852-860.
    [6] ZHANG Xun, HUANG Mao-song, HU Zhi-ping, . Model tests on cumulative deformation characteristics of a single pile subjected to lateral cyclic loading in sand [J]. Rock and Soil Mechanics, 2019, 40(3): 933-941.
    [7] YU Jin, ZHANG Xin, CAI Yan-yan, LIU Shi-yu, TU Bing-xiong, FU Guo-feng, . Meso-damage and mechanical properties degradation of sandstone under combined effect of water chemical corrosion and freeze-thaw cycles [J]. Rock and Soil Mechanics, 2019, 40(2): 455-464.
    [8] CUI Chun-yi, MENG Kun, WU Ya-jun, MA Ke-yan, LIANG Zhi-meng, . Dynamic impedance for vertical vibration of a single pile in axisymmetrically surrounding soil considering radial inhomogeneity [J]. Rock and Soil Mechanics, 2019, 40(2): 570-579.
    [9] DONG Jian-xun, LIU Hai-xiao, LI Zhou. A bounding surface plasticity model of sand for cyclic loading analysis [J]. Rock and Soil Mechanics, 2019, 40(2): 684-692.
    [10] LEI Hua-yang, LIU Guang-xue, ZHOU Jun, . Bearing property and failure mode of double-layer soft clay grounds in a dredger fill site [J]. Rock and Soil Mechanics, 2019, 40(1): 260-268.
    [11] XU Ping, ZHAI Pan-pan, ZHANG Tian-hang, DONG Xin-ping. An exponential-like model of bending stiffness of segment joint for shield tunnel linings [J]. Rock and Soil Mechanics, 2018, 39(S2): 83-90.
    [12] LIU Bin, XU Hong-fa, DONG Lu, , MA Yu-qing, , LI Ke-liang, . A nonlinear rheological model of rock salt based on DS-dashpot under cyclic loading [J]. Rock and Soil Mechanics, 2018, 39(S2): 107-114.
    [13] GUO Hong-xian, ZHOU Ding. Discussion on stability of soil nailing in excavation in soft clay [J]. Rock and Soil Mechanics, 2018, 39(S2): 398-404.
    [14] ZHOU Xiong-xiong, CHI Shi-chun, JIA Yu-feng, XIE Yun-fei, . Detailed simulation method for filling process of high earth and rockfill dams [J]. Rock and Soil Mechanics, 2018, 39(S2): 443-450.
    [15] SHI Gang, LIU Zhong-yu, LI Yong-hui. One-dimensional rheological consolidation of soft clay under cyclic loadings considering non-Darcy flow [J]. , 2018, 39(S1): 521-528.
    Viewed
    Full text


    Abstract

    Cited
      Shared   
      Discussed   
    [1] CHENG Tao, YAN Ke-qin. Numerical simulation for influences of stress paths on earth's surface deformation[J]. , 2010, 31(2): 661 -666 .
    [2] MI Hai-zhen, GAO Chun. Experimental study of expansive behaviors of quicklime[J]. , 2010, 31(4): 1253 -1256 .
    [3] ZHANG Yu-cheng, YANG Guang-hua, JIANG Yan, YAO Jie, SHI Yong-sheng. Numerical simulation analysis of influence of blasting construction of foundation trench of immersed tunnel on stability of embankment[J]. , 2010, 31(S1): 349 -356 .
    [4] SUN Xi-ping, ZHANG Bao-hua, ZHANG Qiang, WANG Xiao-nan. Stability analysis of gravity quay when rubble bedding was eroded by water flow[J]. , 2010, 31(10): 3184 -3190 .
    [5] XIAO Lin, YANG Cheng-kui, HU Zeng-hui, LI Xiao-zhao, LI Mo. Model test on temperature distribution in metro tunnel surrounding rock and inverse calculation of its thermal conductivity[J]. , 2010, 31(S2): 86 -91 .
    [6] CHEN Jing-yu , GONG Xiao-nan, DENG Ya-hong. Research on dissipation of excess pore water pressure in one-dimensional finite strain consolidation of soft clays[J]. , 2009, 30(1): 191 -195 .
    [7] CHEN Qing-yun, SUN Ji-zhu, WANG Ren. Triaxial experiment study of acoustic emission laws of calcareous sand[J]. , 2009, 30(7): 2027 -2030 .
    [8] ZHAN Ji-yan , CHEN Guo-xing , LIU Jian-da. Seismic response characteristics analysis of deep soft site under far-field ground motion of great earthquake[J]. , 2011, 32(S1): 507 -0514 .
    [9] MENG Fan-bing , LIN Cong-mou , CAI li-guang , LI bo. Cumulative damage evaluation of clip rock in small-distance tunnels caused by blasting excavation and its application[J]. , 2011, 32(5): 1491 -1494 .
    [10] CUI Wei, SONG Hui-fang, ZHANG She-rong, YAN Shu-wang. Numerical simulation of craters produced by explosion in soil[J]. , 2011, 32(8): 2523 -2528 .
    Copyright © Rock and Soil Mechanics, All Rights Reserved.
    Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
    Powered by Beijing Magtech Co. Ltd