基于岩土材料特性相关位势理论的堆石料本构模型

为了更好地控制路基的强度和变形，基于岩土材料特性相关的塑性势理论，建立了堆石料本构模型。模型中描述了颗粒级配对各向异性的影响。根据颗粒级配和破碎对分形维数的影响，引入分形理论和组构张量，建立了堆石屈服破坏判据。结合材料性质相关概念和堆石强度试验结果，建立了考虑堆石细观结构、分形维数、颗粒破碎和应力状态的临界状态线。基于新的势理论推导了膨胀方程，建立了受临界状态影响的硬化准则。在新势能理论的框架下，建立了一般应力空间下堆石体的本构模型。通过排水强度试验结果模拟了三维强度及其在π面内的强度变化，验证了不同应力路径下临界状态的描述。通过模拟应力-应变关系，验证了模型的有效性和合理性。To better control the strength and deformation of subgrade, a constitutive model for rockfill materials is established based on the plastic potential theory related to geotechnical material properties. The model describes the effect of particle gradation on anisotropy. Considering the effects of particle gradation and breakage on fractal dimension, fractal theory and fabric tensor are introduced to establish the yield failure criterion for rockfill. Combined with concepts related to material properties and test results of rockfill strength, a critical state line considering the mesostructure, fractal dimension, particle breakage and stress state of rockfill is established. Based on the new potential theory, the dilation equation is derived, and a hardening rule affected by the critical state is established. Within the framework of the new potential theory, a constitutive model of rockfill in general stress space is established. The three-dimensional strength and its variation on the π-plane are simulated based on the drained strength test results, which verifies the description of the critical state under different stress paths. The validity and rationality of the model are verified by simulating the stress-strain relationship.

搜集汇总

背景与挑战

背景概述

该数据集基于岩土材料特性相关的塑性势理论，构建了一个堆石料本构模型，旨在更好地控制路基的强度和变形。模型通过引入分形理论和组构张量，考虑了颗粒级配、破碎和应力状态对临界状态的影响，并推导了膨胀方程和硬化准则。通过排水强度试验和应力-应变关系模拟，验证了模型在不同应力路径下的有效性和合理性。