Unified virgin compression model for saturated clay considering physico-chemical effects and its verification
SONG Zhaoyang1，WEI Changfu2，ZHAO Chenggang1
(1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The influence of pore-salt solution concentration on deformation behavior of soil is an important scientific issue in environmental and energy geotechnical engineering. In order to achieve the quantitative description of the deformation behavior of saturated clay under the coupled action of external load and the pore-solution concentration，a unified virgin compression model of clay considering the influence of salt solution concentration is established based on the intergranular stress equation that considering the physicochemical interactions between solid-liquid phases of soil. Then，consolidation test data of GMZ01 bentonite under different pore salt solution concentrations is used to validate the existence of unified compression theory. What?s more，the unified virgin compression model is used to calculate the void ratio changes of clay under the increasing of salt solution concentrations under constant vertical stresses. At last，pore salt solution concentration-external stress coupled loading test paths are calculated by the proposed model. Calculation results show that the deformation characteristics of clay under different pore salt solution concentrations is well described by the model，which further verifies the correctness of the unified virgin compression model.
2021, Vol. 40 
