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土壤直剪試驗(yàn)的動(dòng)力學(xué)仿真
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國(guó)家自然科學(xué)基金資助項(xiàng)目(51065003)和廣西科技創(chuàng)新能力與條件建設(shè)項(xiàng)目（09-007-05S015）


Dynamics Simulation of Direct Shear Test
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    摘要:

    采用ANSYS/LS-DYNA仿真軟件，利用Lagrange和SPH相結(jié)合的方法及修正的Mohr-Coulomb屈服準(zhǔn)則，建立土壤直剪系統(tǒng)可視化仿真模型，進(jìn)行4種土壤直剪動(dòng)力學(xué)仿真試驗(yàn)，通過回歸分析建立了土壤剪切強(qiáng)度與剪切速度的數(shù)學(xué)模型，研究了土壤剪切破壞過程及剪切速度對(duì)剪切強(qiáng)度的影響規(guī)律及機(jī)理。結(jié)果表明，土壤剪切速度大，剪切強(qiáng)度大，剪切模量小時(shí)，剪切強(qiáng)度與剪切速度呈三次方關(guān)系，剪切模量大時(shí)，剪切強(qiáng)度與剪切速度成對(duì)數(shù)關(guān)系；土壤剪切模量對(duì)剪切強(qiáng)度影響大，剪切模量大，剪切強(qiáng)度大。

    Abstract:

    The direct shear system dynamics simulation model was developed on the basis of the modified Mohr-Coulomb yield criterion by using ANSYS／LS-DYNA 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.

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楊望,蔡敢為,楊堅(jiān).土壤直剪試驗(yàn)的動(dòng)力學(xué)仿真[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2011,42(7):96-101. Yang Wang,Cai Ganwei,Yang Jian. Dynamics Simulation of Direct Shear Test[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(7):96-101.

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