隧道洞口落石防护分流式引导系统原位试验与数值分析

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摘要针对艰险山区隧道洞口落石防护的迫切需要，提出了一种分流式引导系统。开展了2组不同条件下的原位足尺冲击试验，通过高速影像采集与运动分析平台等进行了试验数据采集，并分析了分流式引导系统的分导性能。基于LS-DYNA，建立了分流式引导系统的非线性动力模型，反演分析了足尺试验，研究了落石分导效果及系统的耗能特征，并开展了落石群冲击下分流式引导系统分流能力的参数分析，研究参数包括横向倾角和纵向倾角。结果表明：系统工作可分为拦截和分流两个阶段，在两个阶段均形成了冲击力峰值，分流阶段冲击力峰值为拦截阶段冲击力峰值的64%；减压环耗能约占系统总耗能的50%；系统跨间横向支撑绳初始处于松弛状态下，试块离开系统时横向偏移距离达到了5.75m，试块动能仅为初始冲击能量的15%，分流耗能效果明显；横向倾角在40°~45°区间，纵向倾角在20°左右时，系统能获得较好的分流效果。

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	齐欣1
	邓芊芊1
	赵雷1
	袁松2
	李贞良1
	王希宝2
	余志祥1

关键词 ：分流式引导系统, 足尺试验, 有限元模型, 分导效果

Abstract：Aiming at the urgent need of rockfall protection at the entrance of tunnels in difficult and dangerous mountainous areas, a flexible diversion guiding system is proposed. Here, full-scale impact test were conducted for two sets of diversion guidance system, and the test data was collected by high-speed cameras, data acquisition instruments, etc., and the diversion guidance performance of the system was analyzed. Based on LS-DYNA, the dynamic nonlinear model of the diversion guidance system is established, the full-scale test is inversely analyzed, and the effect of rockfall splitting and the energy consumption characteristics of the system are studied. A parametric analysis of the diversion capacity of the flexible diversion guiding structure was carried out by using rockfall groups impact. The research parameters include the lateral gradient and the longitudinal gradient. The results showed that the flexible diversion guiding structure can be divided into the characteristics of interception stage and diversion stage. the impact force reached the maximum in both stages, The peak impact force in the diversion stage is 64% of the peak impact force in the interception stage; the energy consumption of the brakes accounts for 50% of the total energy consumption of the structure; When the test block of test 2 leaves the system, the lateral offset distance reaches 5.75m, the kinetic energy of the test block is only 15% of the initial impact energy, and the effect of shunt energy dissipation is obvious. Further combined with numerical simulation, the influence of lateral and longitudinal dip angles on the migration ratio under the action of rockfall swarms was investigated. The lateral gradient is between 40 ° and 45 °, and the longitudinal gradient is about 20 °, which can achieve better diversion effect.

Key words： diversion guidance system field test numerical analysis diversion capacity

收稿日期: 2022-07-14 出版日期: 2023-09-15

引用本文:

齐欣1，邓芊芊1，赵雷1，袁松2，李贞良1，王希宝2，余志祥1. 隧道洞口落石防护分流式引导系统原位试验与数值分析[J]. 振动与冲击, 2023, 42(17): 9-16.
QI Xin1, DENG Qianqian1, ZHAO Lei1, YUAN Song2, LI Zhenliang1, WANG Xibao2, YU Zhixiang1. In-situ tests and numerical analysis of a diversion guidance system for rockfall protection at tunnel entrance. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(17): 9-16.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I17/9

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