| 岩土颗粒介质在应力波作用下的接触力与变形关系 |
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| 引用本文： | 陈万祥,郭志昆,黄育.岩土颗粒介质在应力波作用下的接触力与变形关系[J].岩土力学,2010,31(8):2580-2586. |
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| 作者姓名： | 陈万祥 郭志昆 黄育 |
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| 作者单位： | 解放军理工大学工程兵工程学院,南京,210007 |
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| 摘 要： | 为了描述岩土颗粒介质在应力波作用下的接触力与变形关系，运用接触力学和刚体动力学等理论方法，考虑颗粒体之间的局部非线性相互作用，通过引入恢复系数，导出了适用于低速冲击情况下的颗粒介质弹塑性接触模型，通过几种算例的比较分析，说明了该计算方法的合理性。结果表明：本文给出的接触力与变形关系，避开了复杂的增量形式和非线性动态接触问题，且反映了颗粒体的冲击速度、物理力学性质、几何特征以及表面物理条件等因素对接触过程的影响，便于工程推广应用。
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| 关 键 词： | 接触力学 冲击 颗粒介质 恢复系数 接触模型 |
| 收稿时间： | 2010-04-28 |
Contact force-displacement relationship for geotechnical granular medium under stress wave |
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| CHEN Wan-xiang,GUO Zhi-kun,HUANG Yu.Contact force-displacement relationship for geotechnical granular medium under stress wave[J].Rock and Soil Mechanics,2010,31(8):2580-2586. |
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| Authors: | CHEN Wan-xiang GUO Zhi-kun HUANG Yu |
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| Institution: | Engineering Institute of Corps of Engineers，PLA University of Science and Technology, Nanjing 210007, China |
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| Abstract: | In order to describe the force-displacement relationship of geotechnical granular medium under stress wave, an elastoplastic contact model of low velocity impact is derived according to the theories of contact mechanics and rigid dynamics, in which the local nonlinear dynamic interaction of granulae is considered and the coefficient of restitution is introduced. Then the rationalities of the contact model are verified by several examples. The results show that the complicated incremental formula and the problem of nonlinear dynamic contact have been avoided in the contact model; and the effects of many factors such as impact velocity, physico-mechanical property, geometrical characteristic and exterior physical condition of the granulae during contact are taken into account; therefore the contact model is convenient for engineering application. |
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| Keywords: | contact mechanics impact granular medium coefficient of restitution contact model |
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