Constitutive model for coarse-grained dam materials considering state parameter
WEI Kuang-min1, 2, CHEN Sheng-shui1, 2, LI Guo-ying1, 2, FU Zhong-zhi1, 2
1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 2. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing 210029, China
Abstract：The stress-strain relationship of coarse-grained soils is closely related to soil density. The regular constitutive model cannot consider the effect of initial void ratio on mechanical behaviors of coarse-grained soils. In this paper, a two-yield-surface model is proposed for coarse-grained soils based on triaxial tests. The two-yield-surface model using a state parameter so that can reflect the influence of soil density on the peak stress ratio, dilatancy rule, strain hardening or softening rule in shearing of coarse-grained soils. The stress-strain expressions of this model were also deduced. Several kind of coarse-grained soils test results were used to verify the adaptability of the proposed model, results showed that the model predictions are consistent with test results.
魏匡民,陈生水,李国英,傅中志. 基于状态参数的筑坝粗粒土本构模型[J]. 岩土工程学报, 2016, 38(4): 654-661.
WEI Kuang-min, CHEN Sheng-shui, LI Guo-ying, FU Zhong-zhi. Constitutive model for coarse-grained dam materials considering state parameter. Chinese J. Geot. Eng., 2016, 38(4): 654-661.
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