Abstract

In this study, the effect of geofoam compressible cushions on the impact response of the rockfall protection galleries located in a main artery highway connecting the southern Turkey to central Anatolia is investigated. Due to high occurrence risk of rockfall hazard at the mountainous region, permanent protection structures are required to prevent damage. Numerical analyses were carried out to evaluate the performance of EPS geofoam compressible layers with different stiffness characteristics on reducing the transmissibility of the impact forces caused by rockfalls. The kinetic energy levels, expected fall velocities for rock masses and the typical rockfall paths were assessed considering the topography of the hill. Dynamic explicit finite element analyses were performed to investigate the effect of the rockfall impact on a reinforced concrete rock shed. Stresses, strains and displacements on the structural section and the cushioning zone were monitored through the analyses. Based on the results, it was observed that geofoam has a significant effect on reducing the transmitted forces to the structure while increasing the impact duration. In terms of structural displacements, up to 75% reduction is observed when EPS cushions are placed on top of rock shed structure.

摘要

在这项研究中，研究了土工泡沫可压缩垫对位于连接土耳其南部和安纳托利亚中部的主要干道高速公路上的落石保护廊道的冲击响应的影响。由于山区发生落石灾害的风险高，需要永久性保护结构以防止损坏。进行了数值分析，以评估具有不同刚度特性的 EPS 土工泡沫可压缩层在降低落石冲击力传递率方面的性能。考虑到山的地形，评估了动能水平、岩体的预期下落速度和典型的落石路径。进行了动态显式有限元分析，以研究落石冲击对钢筋混凝土岩石棚的影响。通过分析监测结构部分和缓冲区域的应力、应变和位移。结果表明，土工泡沫在减少传递到结构的力方面具有显着效果，同时增加了冲击持续时间。在结构位移方面，当 EPS 垫层放置在岩石棚结构顶部时，观察到高达 75% 的减少。