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| Improved SPH boundary conditions and simulation for large deformation of soil |
| Received:June 21, 2017 Revised:September 27, 2017 |
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| DOI：10.7511/jslx20170621003 |
| KeyWord:SPH boundary condition soil Drucker-Prager model large deformation |
| Author | Institution |
| 骆钊 |
中交第二航务工程局有限公司, 武汉 ;中交公路长大桥建设国家工程研究中心有限公司, 北京 |
| 汪淳 |
上海交通大学 船舶海洋与建筑工程学院, 上海 |
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| Abstract: |
| Landslides may cause serious loss of life and property.Study on the large deformation of soil has great significance to disaster protection engineering.Smoothed Particle Hydrodynamics (SPH), a Lagrangian mesh-free particle method, is suitable for solving such large deformation problems.However, boundary treatment is a key issue in SPH due to the Lagrangian nature of the method.It is difficult to simulate complex boundaries by traditional boundary treatment methods, such as the virtual particle method and the repulsive force method.In this paper, an approach for arbitrary boundaries, i.e.the unified semi-analytical wall (USAW) boundary condition, is employed to solve the particle deficiency problem near the boundary by the introduction of a correction factor and the boundary surface integral.To model the boundary of problem domain more precisely, boundary particles without mass are proposed.Landslides are simulated successfully by the new method, and comparisons with traditional boundary treatment approaches are made.It is found that our method can avoid the zero particle layer problem and is suitable for the simulation of arbitrary wall boundaries.Characteristics of soil dynamics in landsides with respect to some physical parameters, such as internal friction angle and cohesion, are revealed.At last, the method is applied to study the pressure response of a wedge impacted by the landslide. |
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