复杂形态碎石颗粒的三维离散元模拟及试验验证

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中图分类号：TU251.25；TB115.1 文献标志码：B

3D discrete element simulation and test verification of complex form gravel particles

CHENG Xiaoying'，QIAO Ting'，QIN Jianmin2， JI Shunying' （1. National Key Laboratory of Industrial Equipment Structure Analysis and Optimization and CAE Software， Dalian University of Technology，Dalian 116024，Liaoning，China； 2. College of Civil Engineering and Architecture，Dalian University，Dalian ，Liaoning，China）

Abstract： Using the 3D laser scanning device to obtain the gravel’s surface point cloud coordinates，the geometric morphology is reconstructed，the polyhedron discrete element method based on the energyconserving contact theory is applied to describe the motion and interaction of gravel particles. Two benchmark discrete element models are constructed： the angle of repose test and the direct shear box of the gravel particles. The corresponding laboratory tests are running concurrently. The results show that polyhedral element is feasible to simulate the microscopic characteristics of gravel particles，the discrete element model can accurately simulate the dynamic and static characteristics of the gravel particles，and the shear stress-shear strain relationship of the gravel particles under various normal loads and the evolution of the shear zone.Which provides a reference for the polyhedral discrete element method to explore the material mechanical properties of irregular gravel particles.

Key words： discrete element method； polyhedron； gravel particles； angle of repose； direct shear test

0引言

碎石颗粒多由山石风化破碎而成，因其具有较好的强度和硬度，被广泛应用在交通土建工程中，如坝体工程和碎石桩的填料，修筑碎石路基结构等。（剩余10461字）