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综合已有的研究成果,从压缩、剪胀和强度三方面分析颗粒破碎对堆石料应力-应变特性的影响。基于堆石料的变形和强度特性,引入新的硬化参数H,并推导出相应的屈服函数表达式,进而提出一个能够考虑堆石料颗粒破碎影响的弹-塑性本构模型。利用基于空间滑动面准则(SMP准则)的变换应力方法将模型进行三维化,并参照某堆石料大三轴试验结果对三维破碎本构模型的可行性进行验证。最后,利用三维破碎本构模型对不同应力状态下堆石料的应力-应变关系进行模拟。
Based on the existing research results, the influence of particle breakage on the stress-strain characteristics of rockfill materials is analyzed from three aspects: compression, dilatancy and strength. Based on the deformation and strength characteristics of rockfill materials, a new hardening parameter H is introduced and the corresponding yield function expression is deduced. Then a new elastic-plastic constitutive model that can consider the impact of rockfill particles is proposed. The model is transformed into three dimensions by using the transform stress method based on the SMP criterion. The feasibility of the 3D crushing constitutive model is verified with reference to the large triaxial test results of a pile of rockfill materials. Finally, the stress-strain relationship of rockfill materials under different stress states is simulated by three-dimensional crushing constitutive model.