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A modified Davis approach for geotechnical stability analysis involving non-associated soil plasticity
Géotechnique ( IF 5.8 ) Pub Date : 2020-11-17 , DOI: 10.1680/jgeot.18.p.158
Xi Chen 1 , Dongyong Wang 1 , Yuzhen Yu 2 , Yannan Lyu 1
Affiliation  

For geotechnical stability analysis involving non-associated plasticity, the Davis approach with internal friction angle and dilatancy angle updated during the strength reduction process can lead to an improvement over the Davis approach without updating the two angles, according to recent studies. However, the Davis approach with internal friction angle and dilatancy angle updated may be overly conservative, especially for those geotechnical stability analyses involving large friction and small dilation, which provides the motivation to modify the Davis formula. In this work, a modified Davis approach is proposed by enhancing the original Davis formula. Based on the enhancing approach, two modified Davis formulas – a theoretically modified Davis formula derived from the geometric relation and an empirically modified Davis formula by multiplying the original Davis formula by an enhancement function – are investigated. The appropriate values of the parameters in two modified Davis formulas for practical use are studied. Numerical investigations disclose that the modified Davis formulas in conjunction with the appropriate parameters can lead to improved estimations of the geotechnical stability.

中文翻译:

修正的Davis方法用于涉及非相关土壤可塑性的岩土工程稳定性分析

根据最近的研究,对于涉及非相关塑性的岩土工程稳定性分析,在强度降低过程中更新了内部摩擦角和膨胀角的戴维斯方法可以在不更新两个角度的情况下改进戴维斯方法。但是,更新了内部摩擦角和膨胀角的Davis方法可能过于保守,特别是对于那些涉及大摩擦和小膨胀的岩土工程稳定性分析而言,这为修改Davis公式提供了动力。在这项工作中,通过增强原始的戴维斯公式,提出了一种改进的戴维斯方法。基于增强方法,研究了两个修改的Davis公式-从几何关系得出的理论上的修改过的Davis公式和通过将原始Davis公式乘以增强函数得到的经验上的修改过的Davis公式。研究了两个实用的戴维斯公式中合适的参数值。数值研究表明,修改后的戴维斯公式结合适当的参数可以改善对岩土工程稳定性的估计。
更新日期:2020-11-17
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