(1. China Academy of Railway Sciences(Shenzhen) Research and Design Institute Co. Ltd.,Shenzhen 518054,China;
2. School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)
Abstract:In the field of slope engineering,especially in the slope engineering with high and steep dangerous rock mass,rockfall has become one of the main research topics in this field. At present,passive flexible protective net is widely used because of its superior performance. Taking the entrance slope of K158 Baima No.1 Tunnel on Chongqing—Huaihua railway as the research object,the service performance of the current passive protection system is evaluated under the assumption of rockfall in this area. Based on the theory of probability statistics,energy loss and collision rebound,the two-dimensional rockfall trajectory simulation software RocFall is used to simulate. Finally,according to the protection effect of all levels of protective nets,the service performance of passive protective nets is evaluated. The results show that:(1) in the case of no protective net,13.3% of the block in the #1 rockfall area may cause damage to the railway;(2) the current passive protection system has good protection effect for the #1 rockfall area with the mass less than 3 000 kg;(3) the fifth level protective net has no effect. (4) In the current passive protection system,the fourth level protection net mainly plays the role of energy dissipation,and the second and third level protection nets mainly play the role of interception. The research results can provide reference for the design and performance analysis of other rockfall protection.
张治平1,夏志雄1,金昶睿2,赵炼恒2. 基于摄影测量的落石路径获取及被动防护网服役性能评估[J]. 岩石力学与工程学报, 2021, 40(S2): 3274-3283.
ZHANG Zhiping1,XIA Zhixiong1,JIN Changrui2,ZHAO Lianheng2. Acquisition of rockfall path and service performance analysis of passive protective net based on photogrammetry. , 2021, 40(S2): 3274-3283.
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