框架型棚洞承受落石冲击力的模型试验研究

发布时间：2018-03-14 10:29

本文选题：隧道工程　切入点：框架型棚洞　出处：《公路交通科技》2017年03期 　论文类型：期刊论文

【摘要】：针对框架型棚洞在不同种类缓冲垫层防护下抵抗落石冲击力的力学性能,通过大比例尺室内模型试验进行了测试研究。分析了在不同种类缓冲垫层和不同冲击能量下落石冲击力的变化规律;依据试验数据和理论推导给出了反应落石平均冲击力与最大冲击力之间关系的扩大系数,改进了框架型棚洞在不同类型缓冲垫层防护下落石冲击力的计算方法。研究结果表明:改进的落石冲击力计算方法能够综合考虑影响落石冲击力大小的诸多因素;对于特定的落石冲击能量,不同类型的垫层属性所反应的落石冲击力大小实质是受到垫层属性函数f~(h,E,μ,γ)的影响,具体表现为f值越大,不同垫层种类下的冲击力扩大系数的离散性越小,反之越大。
[Abstract]:In view of the mechanical properties of frame shed tunnel under the protection of different kinds of cushioning cushion to resist the impact of falling stone, Based on the large scale indoor model test, the change law of impact force of falling stone in different cushion layer and different impact energy is analyzed. Based on the experimental data and the theoretical derivation, the expansion coefficient of the relationship between the average impact force and the maximum impact force is derived. The calculation method of falling rock impact force of frame shed tunnel in different types of cushion layer is improved. The results show that the improved method can comprehensively consider many factors that affect the impact force of falling stone. For a specific rock falling impact energy, the impact force of different types of cushion attributes is essentially affected by the cushion attribute function (f), 渭, 纬), which is shown as the greater the value of f. The smaller the dispersion of the expansion coefficient of impact force under different cushion species, the greater the opposite.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;中铁二院工程集团有限责任公司;
【基金】：国家自然科学基金项目(51378436) 铁道部科技研究开发计划项目(2010G018-C-1-3)
【分类号】：U451.5

【相似文献】