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圓錐指數(shù)儀貫入沙土試驗的離散元法模擬
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國家自然科學(xué)基金資助項目(30800665);中央高校基本科研業(yè)務(wù)費專項資金資助項目 (YX2010—6)


Discrete Element Simulations of the Cone Penetration Tests in Sandy Soil
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    摘要:

    利用離散元法對圓錐指數(shù)儀貫入沙土的試驗進(jìn)行了數(shù)值模擬研究。貫入試驗與數(shù)值模擬結(jié)果所揭示的現(xiàn)象相吻合，即圓錐側(cè)壁上的土壤摩擦阻力對總貫入阻力影響微小。離散元數(shù)值模擬結(jié)果顯示，貫入圓錐錐尖部位的顆粒力鏈為強力鏈，顆粒的速度數(shù)值較大但方向雜亂，其他位置顆粒幾乎靜止；圓錐指數(shù)儀的貫入阻力隨貫入深度增加而顯著增大；土槽側(cè)壁的正壓力隨貫入深度增加而增大；貫入速度變化對貫入阻力和土槽側(cè)壁正壓力的影響微弱。

    Abstract:

    The simulative study with discrete element method for the cone penetration into the sandy soil was investigated. The results of the simulations and the tests are in good agreement, and the friction on the cone side surface has little influence on the penetration resistance. The conclusion of DEM shows that the strong force chain is located at the cone tip, where the directions of particle velocities are in disorder, while the particles in other place are almost stabile. The penetration resistance increased as the increase of penetration depth, and the normal pressure on the side wall of the soil bin. However, the penetration velocity has little influence on the penetration resistance.

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李艷潔,林劍輝,徐泳.圓錐指數(shù)儀貫入沙土試驗的離散元法模擬[J].農(nóng)業(yè)機(jī)械學(xué)報,2011,42(11):44-48. Li Yanjie, Lin Jianhui, Xu Yong. Discrete Element Simulations of the Cone Penetration Tests in Sandy Soil[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(11):44-48.

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