首页|Soil disturbance evaluation of soft clay based on stress-normalized small-strain stiffness

Soil disturbance evaluation of soft clay based on stress-normalized small-strain stiffness

扫码查看
原文链接
  • 万方数据
Soil disturbance includes the change of stress state and the damage of soil structure.The field testing indices reflect the combined effect of both changes and it is difficult to identify the soil structure disturbance directly from these indices.In the present study,the small-strain shear modulus is used to characterize soil structure disturbance by normalizing the effective stress and void ratio based on Hardin equation.The procedure for evaluating soil sampling disturbance in the field and the further disturbance during the subsequent consolidation process in laboratory test is proposed,and then validated by a case study of soft clay ground.Downhole seismic testing in the field,portable piezoelectric bender elements for the drilled sample and bender elements in triaxial apparatus for the consolidated sample were used to monitor the shear wave velocity of the soil from intact to disturbed and even remolded states.It is found that soil sampling disturbance degree by conventional thin-wall sampler is about 30％according to the proposed procedure,which is slightly higher than that from the modified volume compression method proposed by Hong and Onitsuka(1998).And the additional soil disturbance induced by consolidation in laboratory could reach about 50％when the consolidation pressure is far beyond the structural yield stress,and it follows the plastic volumetric strain quite well.

Natural claySoil sample disturbanceShear wave velocitySmall-strain shear modulusHardin equation

Yanguo Zhou、Yu Tian、Junneng Ye、Xuecheng Bian、Yunmin Chen

展开 >

MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Institute of Geotechnical Engineering,Center for Hypergravity Experiment and Interdisciplinary Research,Zhejiang University,Hangzhou,310058,China

Ningbo Rail Transit Group Co.,Ltd.,Ningbo,315010,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

519786135227837451988101

2024

10.1016/j.jrmge.2023.08.019

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(3)
  • 45