高原冲湖积圆砾土本构模型参数研究

doi:10.3724/1000-6915.jrme.2024.0182

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摘要高原冲湖积圆砾土本构模型研究较少，为了更准确反映圆砾土的应力–应变关系，通过大型三轴固结排水实验，分析高原地区冲湖积圆砾土抗剪强度，结合三轴试验结果对邓肯–张本构模型的适用性进行分析，并对本构模型不足进行改进。结果表明：不同围压下，高原冲湖积圆砾土应变硬化和剪缩性明显，黏聚力和内摩擦角分别为9.4 kPa和41°。对邓肯–张模型适用性分析可知，对于高原冲湖积圆砾土，采用E-B(E为变形模量，B为体积模量)和E-? (?为泊松比)均无法准确反映其应力–应变关系。通过轴向应变的平方与侧向应变存在的抛物线关系，建立函数表达式改进邓肯–张模型试验结果拟合度好，能准确地反映高原冲湖积圆砾土的应力–应变关系。研究成果可为实际工程分析提供参考。

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	郭延辉1
	孔志军2

关键词 ：土力学, 高原冲湖积, 圆砾土, 大型三轴压缩, 本构模型, 模型改进

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.

Key words： soil mechanics plateau alluvial-lake deposits rounded gravelly soils large-scale triaxial compression intrinsic modeling model improvement

引用本文:

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.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0182 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/242

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