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碎石土质路基的失稳破坏是库区公路的主要病害,碎石土抗剪强度参数取值的合理性将直接决定库岸区路基边坡的稳定性。以云南冷清公路路基的碎石土为试验对象,提出库岸区碎石土路基抗剪强度分析与建模方法,分析碎石土路基的抗剪强度参数在不同碎石量和含水量下的特征规律,探讨3种状态下强度参数模型及特征,并在此基础上,提出适用于碎石土路基抗剪强度参数的模型范式。理论计算和实例应用的结果表明,所提出的模型公式简单、实用,基本能反应试验土样的抗剪强度特性,其在坚硬和硬塑状态下具有较高的准确性,而可塑状态下的模型参数仍需更丰富的试验数据标定。
The failure of the gravel soil subgrade is the main road disease in the reservoir area. The reasonable value of the shear strength parameters of the gravel soil will directly determine the stability of the embankment slope in the bank area. Taking Crushed - stone of subgrade as an example, this paper puts forward the shear strength analysis and modeling method of the subgrade of gravel soil in the bank area, and analyzes the shear strength parameters of the subgrade of Crushed - stone subgrade at different gravels and water contents Characteristics of the three kinds of state parameters of the strength model and characteristics of the study, and on this basis, proposed for the gravel soil subgrade shear strength parameters of the model paradigm. The results of theoretical calculation and practical application show that the proposed model formula is simple, practical and can basically reflect the shear strength characteristics of test soil samples, which has high accuracy under hard and hard plastic conditions. However, Model parameters still need richer test data calibration.