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| Modified Duncan-Chang model considering disturbance |
| XU Ri-qing1, ZHANG Jun1, ZHU Jian-feng1,2, WANG Xing-chen1 |
1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University,
Hangzhou 310058,China; 2. Faculty of Architectural Civil Engineering and Environment, Ningbo University,
Ningbo 315211, China |
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Abstract The triaxial test data of ISO standard sand of China under different conditions show that the relative density strongly affect the strength-deformation property of sand. The general disturbance function was proposed based on the disturbed state concept (DSC). The function considered the relative density of sand as the disturbed parameter. Then the modified Duncan-Chang model, which could reflect the contribution of disturbance to the strength-deformation property of sand, was developed through establishing the relationship between parameters K and peak strength and disturbed degree. The material parameters d、g and the parameters of Duncan-Chang model at initial state were given. Then the stress-strain relation of sand at randomly disturbed state can be predicted by the modified model. The test results show that the modified Duncan-Chang model can well describe the stress-strain relation of sand at a given disturbed state.
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Published: 22 February 2012
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考虑扰动影响的修正Duncan-Chang模型
根据中国ISO标准砂在不同条件下的三轴试验资料,发现相对密实度对砂土强度和变形特性有显著影响.基于扰动状态概念(DSC)理论,以砂土相对密实度为扰动参量,建立统一扰动度函数表达式；根据试验结果,建立参数K和峰值强度与统一扰动度之间的函数关系式,提出考虑扰动影响的修正Duncan-Chang模型.给定砂土材料参数d、g以及初始状态下的Duncan-Chang模型参数,通过该修正模型可以对任意扰动度下的砂土应力-应变关系进行预测.试验验证表明,修正Duncan-Chang模型可以较好地反映相应扰动状态下砂土的应力-应变关系.
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