Research on the constitutive model parameters of highland alluvial gravel soil
GUO Yanhui1，KONG Zhijun2
(1. Faculty of Public Safety and Emergency Management，Kunming University of Science and Technology，Kunming，Yunnan 650093，China；2. Collage of Civil Engineering，Huaqiao University，Xiamen，Fujian 361021，China)
Abstract：There is limited research on the constitutive model of highland lake-accumulated gravel soils. To more accurately reflect the stress-strain relationship of gravel soils，a large-scale triaxial consolidated-drained test was conducted to analyze the shear strength of the highland lake-accumulated gravel soils. The applicability of the Duncan-Chang constitutive model was also analyzed based on the triaxial test results，and improvements to the model were proposed to address its shortcomings. The results indicate that under different confining pressures，the highland lake-accumulated gravel soils exhibit significant strain hardening and contraction. The cohesion and internal friction angle are 9.4 kPa and 41°，respectively. The analysis of the Duncan-Chang model's applicability shows that for highland lake-accumulated gravel soils，neither the E-B model(where E is the modulus of deformation and B is the bulk modulus) nor the E-? model(where ? is the Poisson's ratio) can accurately reflect their stress-strain relationship. By establishing a functional expression based on the parabolic relationship between the square of the axial strain and the lateral strain，an improved Duncan-Chang model was developed. The fitting of the experimental results is good，accurately reflecting the stress-strain relationship of highland lake-accumulated gravel soils. The research findings can provide valuable references for practical engineering analysis.
郭延辉1，孔志军2. 高原冲湖积圆砾土本构模型参数研究[J]. 岩石力学与工程学报, 2025, 44(S1): 242-249.
GUO Yanhui1，KONG Zhijun2. Research on the constitutive model parameters of highland alluvial gravel soil. , 2025, 44(S1): 242-249.
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2025, Vol. 44 
