A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deformation modulus of reconstituted and naturally sedimented clays
Abstract The undrained secant deformation modulus E u is an important parameter to quantitatively estimate the undrained settlement of soft clays. A series of isotropically consolidated undrained triaxial compression shear tests were carried out on four reconstituted clays and two naturally sedimented clays to evaluate the effects of the initial water content w 0, liquid limit w L, and soil structure on E u. The test results showed that the variation in E u with deviator stress was significantly affected by w 0 and w L for reconstituted clays. The normalized modulus E u/(p′)0.9 linearly decreased with increasing w 0/w L. This linear relation at a lower w L lies above that at a higher w L. These observations suggest that the soil with lower plasticity and lower initial water content possessed higher values of E u. As the deviator stress increased, the effect of w 0 and w L on E u gradually vanished. It is also evidenced that the value of E u for naturally sedimented clays depended on the soil structure. The soil structure clearly enhanced the E u in the preyield regime in comparison with the corresponding reconstituted clay. Once the soil structure was damaged with increasing consolidation stress in the postyield regime, a significant reduction in E u was observed with a lower value than that of reconstituted clays. The difference in E u/S u between naturally sedimented and reconstituted clays gradually decreased with increasing deviator stress. This implies that the effect of the soil structure on E u diminished at higher deviator stress levels.
Highlights The variation of undrained modulus E u with initial water content is proposed. The normalized modulus E u/(p')0.9 is linearly correlated to w 0/w L. The degradation of E u for natural clay due to loss of soil structure is observed. The influence of soil structure on E u vanishes at higher deviator stress level.
Deformation modulus of reconstituted and naturally sedimented clays
Abstract The undrained secant deformation modulus E u is an important parameter to quantitatively estimate the undrained settlement of soft clays. A series of isotropically consolidated undrained triaxial compression shear tests were carried out on four reconstituted clays and two naturally sedimented clays to evaluate the effects of the initial water content w 0, liquid limit w L, and soil structure on E u. The test results showed that the variation in E u with deviator stress was significantly affected by w 0 and w L for reconstituted clays. The normalized modulus E u/(p′)0.9 linearly decreased with increasing w 0/w L. This linear relation at a lower w L lies above that at a higher w L. These observations suggest that the soil with lower plasticity and lower initial water content possessed higher values of E u. As the deviator stress increased, the effect of w 0 and w L on E u gradually vanished. It is also evidenced that the value of E u for naturally sedimented clays depended on the soil structure. The soil structure clearly enhanced the E u in the preyield regime in comparison with the corresponding reconstituted clay. Once the soil structure was damaged with increasing consolidation stress in the postyield regime, a significant reduction in E u was observed with a lower value than that of reconstituted clays. The difference in E u/S u between naturally sedimented and reconstituted clays gradually decreased with increasing deviator stress. This implies that the effect of the soil structure on E u diminished at higher deviator stress levels.
Highlights The variation of undrained modulus E u with initial water content is proposed. The normalized modulus E u/(p')0.9 is linearly correlated to w 0/w L. The degradation of E u for natural clay due to loss of soil structure is observed. The influence of soil structure on E u vanishes at higher deviator stress level.
Deformation modulus of reconstituted and naturally sedimented clays
Bian, Xia (author) / Zeng, Ling-Ling (author) / Li, Xiao-Zhao (author) / Hong, Jun-Tao (author)
Engineering Geology ; 295
2021-11-01
Article (Journal)
Electronic Resource
English
Estimating hydraulic conductivity of naturally sedimented clays using compression curves
| Springer Verlag | 2022
Simulation of fabric in sedimented clays
| Elsevier | 2014
Simulation of fabric in sedimented clays
| Elsevier | 2014
Simulation of fabric in sedimented clays
| Online Contents | 2014