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通过分析试验资料和以往研究成果,修正了堆石料不同围压下剪切过程峰值应力比表达式,论述了塑性模量对平均应力的依赖性。基于广义塑性理论框架,借鉴Lade-Duncan单屈服面模型中引入塑性功定义硬化规律的思路,对塑性模量进行了修正,提出了一种改进的广义塑性模型。为了验证改进方法的合理性,塑性模量改进方法被应用于刘恩龙模型,同时使用提出的修正广义塑性模型预测了另外两种堆石料试验。不同围压下模型的预测结果与试验结果吻合较好,表明修正的模型可以较好地预测堆石料的应力–应变特性。
By analyzing the experimental data and previous research results, the peak stress ratio of shear process under different confining pressures of rockfill materials was corrected, and the dependence of plastic modulus on average stress was discussed. Based on the generalized plasticity theory framework, the plastic modulus is modified by introducing the definition of plastic work hardening rule in Lade-Duncan single yield surface model, and an improved generalized plastic model is proposed. In order to verify the rationality of the improved method, the plastic modulus improvement method is applied to the Liu En-Long model and the other two types of rockfill materials are predicted using the proposed modified generalized plastic model. The prediction results of the model under different confining pressures are in good agreement with the experimental results, indicating that the modified model can predict the stress-strain characteristics of rockfill materials well.