滚石冲击EPS新型复合拦石墙现场原位试验研究  

In⁃situ Test and Research on New EPS Composite Rock Retaining Wall Impacted by Rolling Rocks

作　　者：李虎成[1] LI Hucheng(China Railway First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道建筑》2023年第2期139-145,共7页Railway Engineering

摘　　要：以聚苯乙烯泡沫(Expanded Polystyrene,EPS)新型复合拦石墙板为研究对象,以合璧津高速公路危岩防护工程为背景,首次开展滚石冲击拦石墙现场大型原位试验,研究滚石冲击EPS复合拦石墙动力作用过程,揭示EPS泡沫板在滚石灾害防治结构设计中的耗能减震机理。采用有限元分析软件验证了现场试验结果的准确性,并讨论了钢板夹层厚度对结构耗能效率的影响,为提高结构抗冲击性能引入钢管耗能器进行结构优化。结果表明:EPS复合拦石墙降低了滚石冲击接触压力,最高可达43%;保持EPS缓冲层厚度不变,其材料密度越小,则耗能效果越显著,但EPS缓冲层密度降低的同时也将导致复合结构的抗冲切破坏能力下降;钢板夹层越厚,结构耗能效果越好,相较于15 mm钢板,35 mm钢板耗能效果可提升约25%;布设耗能器可有效提高结构抗冲击能力,且在结构中心位置布设耗能器时效果最佳,耗能效果提升31.8%;耗能器个数与结构耗能效果呈正相关关系。Taking the new Expanded Polystyrene foam(EPS)composite rock retaining wall panel as the research object and the dangerous rock protection project of Hechuan-Bishan-Jiangjin Expressway as the background,a large�scale in-situ test was carried out for the first time,and the dynamic action process of EPS composite rock retaining wall impacted by rolling rocks was studied.The energy dissipation and vibration reduction mechanism of EPS foam panel in the structural design of rolling rock disaster prevention and control was revealed.The accuracy of the field test results was verified by the finite element analysis software,and the influence of the thickness of the steel plate interlayer on the energy dissipation efficiency of the structure was discussed.In order to improve the impact resistance of the structure,the steel tube energy dissipation device was introduced for structural optimization.The results show that the EPS composite rock retaining wall can reduce the impact contact pressure of rock rolling,up to 43%.Keeping the thickness of EPS buffer layer unchanged,the smaller the material density is,the more significant the energy dissipation effect will be.However,the lower the density of EPS buffer layer will also lead to the reduction of the punching and shearing resistance of the composite structure.The thicker the steel plate interlayer,the better the energy consumption effect of the structure.Compared with 15 mm steel plate,the energy dissipation effect of 35 mm steel plate can be increased by about 25%.The deployment of energy dissipators can effectively improve the impact resistance of the structure,and the best effect is to deploy energy dissipators at the center of the structure,with the energy consumption effect increased by 31.8%.The number of energy dissipators is positively correlated with the energy dissipation effect of the structure.

关 键 词：边坡 拦石墙 现场原位试验 数值模拟 EPS缓冲材料 动力响应 滚石 

分 类 号：U213.152.2[交通运输工程—道路与铁道工程]