Experimental investigation on three-bay and single-span flexible rock-shed under impact of rockfall
Wang Min1,2 Shi Shaoqing1 Cui Lianming1 Liu Yingfeng1 Yang Youkui3
1. Chongqing Engineering Research Center for Geological Hazard Prevention and Treatment, Chongqing 401311, China;
2. Nanjing University of Science and Technology, Nanjing 210094, China;
3. Geobrugg (Chengdu) Co., Ltd., Chengdu 611731, China
Abstract：In order to overcome construction difficulty, reduce costs of conventional concrete rock-shed, and satisfy the emergency construction and maintenance, a new type of flexible rock-shed made of flexible nets held up by specially designed steel vaulted structure was proposed. Due to the differences of the load transfer and the energy dissipation mechanism between the single-bay and single-span flexible rock-shed and three-bay and single-span flexible rock-shed, the design scheme and 1∶1 prototype model of the three-bay and single-span flexible rock-shed was proposed and manufactured based on the research of the single-bay and single-span flexible rock-shed. The experiments on the three-bay and single-span flexible rock-shed were conducted under the impact of the rockfall with energy of 25kJ, 50kJ, 100kJ and 250kJ. It is shown that the flexible rock-shed can withstand the impact energy of less than 100kJ and can be reused without the necessity of maintenance of structural members; and can withstand the impact energy of about 250kJ and could be reused after some simple maintenance; and the clearance inside the flexible rock-shed satisfied the safety requirements. By employing dynamic strain rosettes, load cells and high-speed camera, the impact process of rockfall and dynamic response of the steel vaulted structure were recorded and tested. By combining with the test data, the deformation, the load transfer and the energy dissipation mechanism and the failure characteristics were analyzed. The weak position of the three-bay and single-span flexible rock-shed was pointed out and some improvement measures for the flexible rock-shed were suggested.
汪敏 石少卿 崔廉明 刘盈丰 阳友奎 . 三开间单跨柔性棚洞在落石冲击作用下的试验研究[J]. 土木工程学报, 2018, 51(5): 37-47.
Wang Min Shi Shaoqing Cui Lianming Liu Yingfeng Yang Youkui. Experimental investigation on three-bay and single-span flexible rock-shed under impact of rockfall. 土木工程学报, 2018, 51(5): 37-47.
