基于SPH算法土壤水射流冲击演化数值仿真研究
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摘要
针对传统有网格有限元方法在研究土壤水射流冲击时的精度不足问题,提出了一种具有含水率信息的土壤流固耦合数值计算建模方法,并依据此方法建立一个土壤水射流冲击数值计算模型分析土壤在水射流冲击下的演化过程,通过与实验对比,改进模型可以有效的模拟土壤在水射流冲击作用下的动力学行为,很好地解决了传统有限元方法在处理土体大变形时产生的网格畸变问题。分析了含水率对土壤抗水射流冲击的影响关系。分析对比了不同直径水射流对土壤冲蚀坑直径形成的影响,确定了它们之间的内在关系,具有一定的工程应用指导意义。
Aiming at the inaccuracy of the traditional finite element method in studying the impact of soil water jet, a modeling method of soil fluid-structure interaction with moisture content information was proposed, and a numerical model of soil water jet impact was established to analyze the process of soil under water jet impact by the method. Compared with experiments, the improved model can effectively simulate the dynamic behavior of soil under water jet impact and the mesh distortion problems of traditional finite element method in dealing with large deformation of soil mass was solved. The relationship between moisture content and resistance of soil under water jet impact was analyzed. The influence of different diameter water jets on soil erosion was analyzed and compared, and the inherent relationship between them was determined, which is quite useful in guiding engineering application.
Aiming at the inaccuracy of the traditional finite element method in studying the impact of soil water jet, a modeling method of soil fluid-structure interaction with moisture content information was proposed, and a numerical model of soil water jet impact was established to analyze the process of soil under water jet impact by the method. Compared with experiments, the improved model can effectively simulate the dynamic behavior of soil under water jet impact and the mesh distortion problems of traditional finite element method in dealing with large deformation of soil mass was solved. The relationship between moisture content and resistance of soil under water jet impact was analyzed. The influence of different diameter water jets on soil erosion was analyzed and compared, and the inherent relationship between them was determined, which is quite useful in guiding engineering application.
引文
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[17] Su Ji-Hong, et al. Study and application of yield criteria to rock and soil[J]. Engineering Mechanics, 2003,20(3):72-77.
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[20] 林晓东等, 基于SPH-FEM耦合算法的磨料水射流破岩数值模拟[J]. 振动与冲击, 2014,(18):170-176.
[2] 倪红坚,王瑞和,张延庆. 高压水射流作用下岩石的损伤模型[J]. 工程力学, 2003,20(5): 59-62.
[3] 孙清德,等. 高压水射流破岩规律的数值模拟研究[J] .岩石力学, 2005,26(6):978-982.
[4] H Mizuno, T Mizuyama, N Minami, S Kuraoka. Analysis of simulating debris flow captured by permeable type dam using distinct element method[J]. Journal of the Japanese Society of Erosion Control Engineering, 2000,52(6): 4-11.
[5] T Sasaki, Y Ohnishi, R Yohinaka. Discontinues deformation analysis and its application to rock mechanics problems[J]. Journal of Geotechnical Engineering, JSCE, 1994,Ⅲ-27: 11-20.
[6] S Arimoto, A Murakami. Characteristics of localized behavior of saturated soil by EFG[C]. Proceedings of 1st International Workshop on New Frontiers in Computational Geomechanics, Banff, 2002: 169–172.
[7] G W Baxter, R P Behringer. Cellular automata modelsof granular flow[J]. Physical Review A, 1990,42(2):1017-1020.
[8] G R Liu, M B Liu. Smoothed particle hydrodynamics-ameshfree particle method[M]. New Jersey: World Scientific Publishing Company, 2003.
[9] Huang Yu, Hao Liang, Nonoyama Hideto. The stateof art of the SPH method applied in geotechnicalengineering[J]. Chinese Journal of Geotechnical Engineering(in Chinese), 2008,30(2):256-262.
[10] 黄雨,等, 土体流动大变形的SPH数值模拟. 岩土[J]. 工程学报, 2009,(10):1520-1524.
[11] H H Bui, et al. Lagrangian meshfree particles method(SPH) for large deformation and failure flows of geomaterial using elastic–plastic soil constitutive model[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2008,32(12):1537-1570.
[12] J K Chen, J E Beraun, C J Jih. An improvement for tensile instability in smoothed particle hydrodynamics[J]. Computational Mechanics, 1999,23:279-287.
[13] 谭罗荣. 土的微观结构研究概况和发展.岩土力学, 1983,4(1):73-85.
[14] J O Hallquist. Ls-Dyna Theoretical Manual[Z]. Livermore:Livermore Software Technology Corporation , 1998.
[15] 李晓杰,张程娇,王小红,闫鸿浩. 水的状态方程对水下爆炸影响的研究[J]. 工程力学, 2014,31(8):46-52.
[16] 周凤玺,李世荣. 广义Drucker-Prager 强度准则[J]. 岩土力学, 2008,29(3):747-751.
[17] Su Ji-Hong, et al. Study and application of yield criteria to rock and soil[J]. Engineering Mechanics, 2003,20(3):72-77.
[18] 陈颖平,黄博,陈云敏. 循环荷载作用下结构性软黏土的变形和强度特性[J]. 岩土工程学报, 2005,27(9):1065-1071.
[19] 王瑞麟,张贞良,喻谷源. 土槽中剪切元件的试验和剪应力计算[J]. 农业机械学报, 1979,(4):23-41.
[20] 林晓东等, 基于SPH-FEM耦合算法的磨料水射流破岩数值模拟[J]. 振动与冲击, 2014,(18):170-176.