柔性网结构对碎屑流冲击力学特征的影响研究

doi:10.13722/j.cnki.jrme.2022.0183

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摘要柔性防护网是山区崩塌碎屑流常用的拦挡结构。目前柔性网的结构设计仍普遍采用经验系数法，忽略了碎屑流结构特征对碎屑流冲击力学特征的影响。为此结合物理试验和离散元数值仿真试验研究横向支撑绳、主网、副网和耗能器4个柔性网构件在碎屑流冲击作用下的力学特征。研究结果表明，在设置了侧向拉绳的情况下，横向支撑绳数量对碎屑流冲击作用下柔性网内最大拉力的影响较小；当碎屑流的透过性少于10%时，副网的布设并不会大幅改变碎屑流对柔性网的冲击荷载；网型是柔性网大变形能力的重要指标，柔性网网面的大变形是由于网片的网格形态改变释放的变形，而不是网面材料本身的变形；耗能器不仅可以降低支撑绳内的最大拉力还可以改变支撑绳之间的荷载传递。

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	肖思友1
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关键词 ：灾害地质学, 碎屑流, 柔性网, 冲击, 大变形, 离散元

Abstract：Flexible barriers have been widely used for the mitigation of nature hazards including rockfall and granular flow. In practice，the empirical coefficient method is usually used for designing the flexible barriers without the consideration of the structure characteristics. In this study，the effects of the number of the cable，the type of the main mesh，the installation of the auxiliary mesh and the installation of the energy dissipator on the impact characteristics of the granular flow against the flexible barrier were revealed using the physical flume tests and the Discrete Element Method(DEM). The results shows that the increase in the number of the horizontal cable has less effects on the decrease in the maximum tensile force of the cables if the lateral cables are installed. The geometry of the mesh grid is an important index for estimating the large deformation of the flexible barrier. The changes in the geometries of the mesh grids are the main cause of the large deformation of the flexible barrier，rather than the deformation of the mesh material. The installation of the auxiliary mesh has less effects on the maximum tensile force of the flexible barrier if the ratio of the particles passing through the mesh is less than 10%. The installation of the energy dissipators can not only decrease the maximum tensile load of the cables，but also change the load transmission between the cables.

Key words： disaster geology granular flow flexible barrier impact large deformation DEM

引用本文:

肖思友1，2，苏立君3，姜元俊3，魏中举2. 柔性网结构对碎屑流冲击力学特征的影响研究[J]. 岩石力学与工程学报, 2022, 41(12): 2473-2484.
XIAO Siyou1，2，SU Lijun3，JIANG Yuanjun3，WEI Zhongju2. Investigation on impact characteristics of granular flow against different structures of flexible barriers. , 2022, 41(12): 2473-2484.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0183 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2473

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