落石冲击作用下柔性棚洞结构灵敏度分析  

Sensitivity Analysis of Flexible Shield Structure under Rockfall Impact

作　　者：刘成清[1] 郭浩宇 LIU Chengqing;GUO Haoyu(Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学,成都610031

出　　处：《铁道工程学报》2022年第1期67-72,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51778538);国家留学基金委项目(201707005100)。

摘　　要：研究目的:柔性棚洞是一种拦截边坡落石的被动防护结构,凭借施工方便、经济环保等特点广泛运用于落石灾害防护领域,但是目前没有规范指导柔性棚洞结构进行设计。本文基于能量法建立落石冲击柔性棚洞结构失效模型等三个模型,采用Sobol’全局灵敏度分析法得到柔性棚洞结构参数一阶、全局灵敏度,提出柔性棚洞结构优化设计思路。研究结论:(1)同一参数在不同计算模型中灵敏程度不同;(2)参数间相互作用明显,三个模型中所有参数全局灵敏度相较一阶灵敏度有不同程度增长;(3)柔性棚洞结构失效模型中,较小幅度的调整高灵敏度参数(通行界限和钢丝绳等效横截面积)可使结构满足设计要求同时用钢量增加最少;(4)本研究成果可用于柔性棚洞结构优化设计,使结构设计更具经济性。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.

关 键 词：柔性棚洞结构 能量法 失效模型 Sobol’法 全局灵敏度 

分 类 号：TU391[建筑科学—结构工程]