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工程地质学报  2018, Vol. 26 Issue (5): 1279-1284    DOI: 10.13544/j.cnki.jeg.2018114
岩土体工程地质 最新目录 | 下期目录 | 过刊浏览 | 高级检索  |   
基于三维并行SPH模型的土体流滑特性研究
张卫杰1, 郑虎2, 王占彬1, 高玉峰1
1. 岩土力学与堤坝工程教育部重点实验室, 河海大学 南京 210098;
2. 地球科学与工程学院, 河海大学 南京 210098
STUDY ON FLOWING BEHAVIOR OF SOIL BASED ON THREE DIMENSIONAL AND PARALLELIZED SPH MODEL
ZHANG Weijie1, ZHENG Hu2, WANG Zhanbin1, GAO Yufeng1
1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098;
2. School of Earth Science and Engineering, Hohai University, Nanjing 210098
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摘要 土体的大变形流滑导致了许多地质灾害的发生,对人们的生命财产安全构成了极大的威胁,因此越来越多的研究开始关注土体的大变形流滑特性。其中,光滑粒子流体动力学(SPH)方法是常用的模拟方法之一,但SPH方法的粒子特性导致其计算时间过长,影响了在工程地质领域的进一步应用。对此,本研究基于SPH方法的基本原理、非牛顿流体理论和等效黏度概念,提出了适用于土体大变形流滑分析的三维SPH仿真模型。结合OpenMP并行计算原理,实现了SPH算法的并行优化。在此基础上,对土体流滑模型试验进行了二维和三维分析,得到了滑动距离、滑动冲击力和冲击力峰值等动力学参数,分析了计算维数和边界条件对流滑特性的影响机制。通过不同线程数下计算时间的对比,获得了计算效率随线程数的变化规律。结果证明了本文的OpenMP并行优化具有较高的计算效率,显著降低了三维SPH模拟的计算耗时,对工程地质数值方法的效率提升具有重要的借鉴意义。
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张卫杰
郑虎
王占彬
高玉峰
关键词土体流滑   光滑粒子流体动力学   三维分析   并行优化     
Abstract: The Smoothed Particle Hydrodynamics(SPH)method has been widely used in the simulation of geohazards with large deformation. However, as a particle method, SPH analysis is usually time consuming for the case with a lot of particles. Thus it is essential to conduct the study on the efficiency improvement of SPH method. Here, we propose a 3D SPH model for the analysis of soil flowing based on the principles of SPH method, non Newtonian fluid theory and the concept of equivalent viscosity. Then, the parallel implementation of this model is conducted using the OpenMP framework. For a model test of flowing granular soil, the 2D and 3D simulations are conducted with the proposed SPH model. The comparisons of flowing distance and impact force indicate that both the boundary effect and viscosity effect in the 3D cases are larger than those in the 2D cases, which can cause the decreasing of flowing distance and impact force. Meanwhile, by comparing the speed up ratios under different number of threads, we found that the efficiency has been greatly improved. The proposed SPH model can achieve a good simulation of flowing soil and make the best use of multi-core technology of modern computers. The paper can provide a potential reference to other numerical methods in engineering geology.
Key wordsSoil flowing   Smoothed particle hydrodynamics   Three dimensional analysis   Parallel optimization   
收稿日期: 2018-04-28;
基金资助:江苏省自然科学基金青年项目(BK20170887),国家自然科学基金(41630638,41672256),博士后基金面上项目(2017M611673)资助
作者简介: 张卫杰(1986-),男,博士,讲师,主要从事边坡地质灾害防治方面的科研与教学工作.Email:zhangwj2016@hhu.edu.cn
引用本文:   
张卫杰,郑虎,王占彬等. 基于三维并行SPH模型的土体流滑特性研究[J]. 工程地质学报, 2018, 26(5): 1279-1284.
ZHANG Weijie,ZHENG Hu,WANG Zhanbin et al. STUDY ON FLOWING BEHAVIOR OF SOIL BASED ON THREE DIMENSIONAL AND PARALLELIZED SPH MODEL[J]. Journal of Engineering Geology, 2018, 26(5): 1279-1284.
 
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