防治危岩落石桥梁棚洞一体化结构设计防护能级划分标准研究

Research on the Standard of Protection Level Division for Integrated Structure Design of Roof and Cave of Bridge to Prevent Dangerous Rock Fall

基于铁路工程建设运营安全需求,尤其是中西部山区危岩落石易发的实际情况,分析国内外防治危岩落石防护柔性和刚性棚洞应用现状,对比防护网、明洞、棚洞不同结构类型情况下防护方式的防护能级范围,梳理目前国内铁路典型棚洞设计能级指标实际,针对桥梁棚洞一体化结构特点、常见落石计算防护能级和200、500、1000 kJ 3种防护能级在主梁、棚洞使用钢筋、混凝土用量的经济性比较,提出我国铁路工程防治危岩落石桥梁棚洞一体化结构设计防护能级划分标准建议。

Based on the safety requirements of railway engineering construction and operation,especially the actual situation of dangerous rock fall in the mountainous areas of central and western China,the application status of flexible and rigid hangar tunnel protection against dangerous rock fall is analyzed at home and abroad,and the protection level ranges of protection methods under different structural types of protection net,open cut tunnel and hangar tunnel are compared,and the actual design energy level indexes of typical hangar tunnel in China is sorted out.Based on the characteristics of the integrated structure of bridge shed and tunnel,the common calculated rock falling protection level and the economic comparison of the amount of steel bar and concrete used in the main beam and tunnel of 200kJ,500 kJ and 1000 kJ protection levels,the paper puts forward the standard suggestion for the design of protection level of the integrated structure of bridge shed and tunnel for preventing dangerous rock fall in railway engineering in China.