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| Citation: | Xia Chengzhi, Shi Zhenming, Li Bo, Zheng Hongchao, Liu Maomao, 2022. Verification and Application of an Improved Smooth Particle Hydrodynamics Method for a Rock Slope under Seismic Conditions. Earth Science, 47(12): 4469-4483. doi: 10.3799/dqkx.2022.318
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A smooth particle hydrodynamics (SPH) with an improved damage framework was proposed, called kernel-broken smoothed particle hydrodynamics (KBSPH), to simulate the crack propagation and fracture of rock slope under seismic conditions. In KBSPH, an improved damage framework was proposed, which improved the kernel function of damaged particles by introducing a fracture symbol, directly leading to the fracture of the virtual stress bonds of damaged particles. Therefore, the cracks were generated between the virtual bonds, and the crack propagation process of the rock mass is simulated. A double-layer boundary was developed by separating the dynamic boundary from the viscous boundary. Firstly, the dynamic characteristics of KBSPH were verified by thin plate vibration experiments. Secondly, the fracture mechanical properties of KBSPH were verified by a uniaxial compression test of a single fractured rock mass. Finally, the crack propagation process and dynamic response in the multi-joint rock slope under seismic conditions are simulated. The result shows that the thin plate vibration experiment verifies the accuracy of the dynamic characteristics of KBSPH. The uniaxial compression test of single-crack rock mass proves that KBSPH can correctly simulate airfoil cracks at the tip of prefabricated cracks. By comparing the previous numerical simulation methods and field cases, KBSPH correctly reveals the acceleration amplification effect and the crack propagation of the rock slope under earthquake conditions. KBSPH avoids the grid distortion of traditional algorithms and the redistribution of stress components of damaged particles. It reduces the difficulty of programming and improves the running speed. It infers that the KBSPH method is effective and shows promise for applications to more rock slopes under earthquake conditions and understanding of rock fracture mechanisms.
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