摘要
采用ANSYS/LS DYNA仿真软件,利用Lagrange和SPH相结合的方法及修正的Mohr Coulomb屈服准则,建立土壤直剪系统可视化仿真模型,进行4种土壤直剪动力学仿真试验,通过回归分析建立了土壤剪切强度与剪切速度的数学模型,研究了土壤剪切破坏过程及剪切速度对剪切强度的影响规律及机理。结果表明,土壤剪切速度大,剪切强度大,剪切模量小时,剪切强度与剪切速度呈三次方关系,剪切模量大时,剪切强度与剪切速度成对数关系;土壤剪切模量对剪切强度影响大,剪切模量大,剪切强度大。
The direct shear system dynamics simulation model was developed on the basis of the modified MohrCoulomb yield criterion by using ANSYS/LSDYNA and a combination of Lagrange and smoothed particle hydrodynamics（SPH）.The dynamics simulation experiments of direct shear on four kinds of soil have been carried out.The mathematic models of soil shear strength and shearing speed were established by regression analysis.The research on soil shear failure process and the influence law and mechanism of shearing speed on shear strength was done.The results showed that with shearing speed increasing,shear strength increased.Third-order relationship exits between shear strength and shearing speed with small shear modulus.Logarithm relationship exits between shear strength and shearing speed with large shear modulus.The effect of shear modulus on shear strength is large.The large shear strength is with large shear modulus.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第7期96-101,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51065003)
广西科技创新能力与条件建设项目(0900705S015)
关键词
土壤
直剪
剪切强度
剪切速度
机理
动力学仿真
Soil
Direct shear
Shear strength
Shearing speed
Mechanism
Dynamics simulation
作者简介
杨望，博士生，主要从事甘蔗和木薯收获机械动力学仿真及性能优化研究，E-mail：yanghope@163．com
通讯作者：杨坚，教授，主要从事农业机械设计及性能优化研究，E-mail：yangokok@gxu．edu．cn
