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Study on determining of reinforced concrete false roof strength and design of reinforcement based on reliability theory
Authors:Fan Wenlu  Li Xibing  Hu Guohong
Institution:Beijing Canbao Architecture Design Institute, Beijing 100036, China;Beijing Canbao Architecture Design Institute, Beijing 100036, China;Beijing Canbao Architecture Design Institute, Beijing 100036, China;Beijing Canbao Architecture Design Institute, Beijing 100036, China
Abstract:The non coupled charge explosion and geo mechanical dynamics problem in real air condition is studied in this paper. It analyzes and calculates the problem by using the real air state equations. Through researching on the non coupled charge rock bench blasting with big clearance of air, its result indicates that the borehole wall reflection overpressure is far higher than strength of rock, but much lower than detonation front pressure of the charge. So non coupled charge explosion blasting engineering is very successful. Furthermore, it introduces the method of shaft forming by blasting once and the new tube room technology. And the non coupled charge explosion is used successfully in the method of shaft forming by blasting once. As it drills and blasts in the top and removes the broken rock from the bottom tunnel, it increases the construction efficiency significantly. This paper has important reference on the improvement of the large span underground engineering construction.
Keywords:non coupled charge  the real air state equations  shock wave  the method of shaft forming by blasting once  the new tube room technology
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