土石混合体二维细观结构模型的建立与数值流形法模拟

发布时间：2018-08-20 18:51

【摘要】：作为常见的岩土工程材料,对土石混合体的数值模拟能为工程建设提供直接依据。土石混合体的数值模拟包含建模和仿真阶段。在建模阶段,提出了基于石氏接触理论的背景网格-EAB块石投放算法,新的算法避免了块石的反复投放与块石间重叠判定,提高了块石投放建模的效率。在数值仿真阶段,将数值流形法(NMM)应用到二维土石混合体的模拟中,对二维土石混合体的计算模型进行了适应性的简化,通过对每个块石生成单独的数学覆盖,为土体建立统一的数学覆盖,建立了适用于土石混合体的计算模型,该模型可用于模拟填石等散体系统和连续介质共同作用。最后,通过对二维土石混合体试件进行压缩试验的算例,展现了围压对于土石混合体峰值抗压强度的影响,以及土石错动对于土石混合体抗压强度演化的影响,验证了该计算模型在模拟散体系统与连续介质共同作用时的有效性和适用性。
[Abstract]:As a common geotechnical engineering material, numerical simulation of soil-rock mixture can provide direct basis for engineering construction. The numerical simulation of soil and rock mixture includes modeling and simulation. In the stage of modeling, the background grid-EAB block placement algorithm based on the stone contact theory is proposed. The new algorithm avoids the repeated dropping of the block stone and the judgment of overlap between the blocks, and improves the efficiency of the modeling of the block stone. In the stage of numerical simulation, the numerical manifold method (NMM) is applied to the simulation of two-dimensional soil-rock mixture, and the computational model of two-dimensional soil-rock mixture is simplified adaptively. A unified mathematical covering model for soil mass is established. The model can be used to simulate the interaction between rock filling and other granular systems and continuum media. Finally, the influence of confining pressure on the peak compressive strength of soil-rock mixture and the influence of soil and rock dislocation on the evolution of compressive strength of soil-rock mixture are demonstrated by an example of compression test of two-dimensional soil-rock mixture. The validity and applicability of the model in simulating the interaction between bulk system and continuum medium are verified.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;河南工业大学土木建筑学院;
【基金】：“973”项目资助(No.2014CB047100) 国家自然科学基金项目资助(No.11572009,No.51538001,No.51609240)~~
【分类号】：TU43

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