基于滚石运动参数的防护网数值模拟
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U213.1

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国家自然科学基金项目


Research on Rolling Stone Movement State and Prevention
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    被动柔性防护网是目前有效治理滚石灾害的一种防护装置,它的设计选型、现场布置位置和系统的布设高度取决于滚石在坡面上的运动轨迹以及相关的动力学参数,本文基于Hertz接触力学,运动学以及土体的线弹性本构模型对滚石各个运动阶段进行了公式化推导并利用现有的滚石模拟软件进行了验证,数值模拟显示两缓一陡,两陡一缓坡面能减少碰撞抛射次数并有效降低滚石能量 ,被碎石、角砾、土壤和植被覆盖的坡面材料能有效增加滚石能量的损耗。利用ANSYS/LS-DYNA,对R7/3/300网片进行数值验证,结果显示能有效拦截了滚石,说明选取网片适宜。本文基于能量与运动学理论推导了滚石各阶段公式,基于滚石运动参数的防护网数值模拟设计更为经济与安全,实际应用价值较高。

    Abstract:

    Passive flexible protective net is a kind of protective device for effective management of rolling stone disasters. Its design selection, site layout location and system layout height depend on the rolling trajectory of the rolling stone on the slope and related dynamic parameters. This article is based on Hertz The contact mechanics, kinematics, and the linear elastic constitutive model of the soil mass formulate the derivation of each rolling stage of rolling stones and verify them with the existing rolling stone simulation software. Numerical simulations show that two slopes and one steep slope can be reduced. The number of collision projections effectively reduces the rolling stone energy, and the slope material covered by rubble, breccia, soil and vegetation can effectively increase the loss of rolling stone energy. Using ANSYS / LS-DYNA to perform numerical verification on the R7 / 3/300 mesh, the results show that it can effectively block the rolling stones, indicating that it is appropriate to select the mesh. Based on the theory of energy and kinematics, the formulas of the various stages of rolling stones are derived in this paper. The numerical simulation design of the protective net based on the parameters of rolling stones is more economical and safe, and has higher practical application value.

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刘成清,陈玉满. 基于滚石运动参数的防护网数值模拟[J]. 科学技术与工程, 2020, 20(18): 7422-7428.
Liu Chenqing, Chen Yuman. Research on Rolling Stone Movement State and Prevention[J]. Science Technology and Engineering,2020,20(18):7422-7428.

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  • 收稿日期:2020-01-06
  • 最后修改日期:2020-05-05
  • 录用日期:2020-02-21
  • 在线发布日期: 2020-07-28
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