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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。
As a common geotechnical engineering material, the numerical simulation of soil-rock mixture can provide a direct basis for engineering construction. The numerical simulation of soil-rock mixtures includes the modeling and simulation stages. In the modeling stage, a background grid-EAB block placement algorithm based on Shi’s contact theory is proposed. The new algorithm avoids the repeated placement of blocks and blocks and determines the overlap between blocks, and improves the efficiency of block modeling. In the numerical simulation stage, numerical manifold method (NMM) is applied to the simulation of two-dimensional soil-rock mixture. The computational model of two-dimensional soil-rock mixture is simplified adaptively. By generating separate mathematics for each rock mass, Covering and establishing a unified mathematical coverage for the soil. The calculation model suitable for the mixture of soil and rock is established. The model can be used to simulate the interaction between the granular system and the continuous medium. Finally, an example of compressive test of two-dimensional soil-rock mixture specimens is presented to show the effect of confining pressure on the peak compressive strength of soil-rock mixture and the influence of rock-soil dislocation on the compressive strength evolution of soil-rock mixture. The validity and applicability of this computational model in simulating the interaction of a discrete system with a continuous medium.