落石冲击作用下柔性棚洞结构灵敏度分析

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Abstract Research purposes:The flexible shield is a passive protective structure for slopes to intercept falling rock. With the characteristics of convenient construction, economical cost and environmental protection, the flexible shield structure is widely used in the rockfall disaster protection field. However, there are no codes to guide the design of the flexible shield structure. In this paper, three models such as the failure model of the flexible shield structure under rock impact are established based on energy method, Sobol' global analysis method is used to obtain the first-order sensitivity and global sensitivity of the flexible shield structure parameters, and an optimal design idea of the flexible shield structure is proposed.
Research conclusions:(1) The same parameter has different sensitive degrees in different calculation models; (2) The interaction between the parameters is obvious, and the global sensitivity of all parameters in the three models increases in different degrees compared with the first-order sensitivity; (3) In the flexible shield structure failure model, the smaller adjustment of high sensitivity parameters including the limit distance of falling rock and the equivalent cross-sectional area of cable can make the structure meet the design requirements and minimize the increase of steel consumption; (4) The research results can be used in the optimal design of the flexible shield structure, making structure design more economical.

Key words： flexible shield structure energy method failure model Sobol method global sensitivity

Received: 28 April 2021

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TU391

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	LIU Chengqing
	GUO Haoyu

Cite this article:

LIU Chengqing,GUO Haoyu. Sensitivity Analysis of Flexible Shield Structure under Rockfall Impact[J]. Journal of Railway Engineering Society, 2022, 39(1): 67-72.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I1/67

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