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3D Numerical Simulation of Tunnel Blasting Vibration Laws under Axial Uncoupled Charge with Water Medium
(1 China Railway Chengdu Group Co., Ltd., Chengdu 610082; 2 School of Civil Engineering of Central South University, Changsha 410075; 3 The Key Laboratory of Engineering Structures of Heavy Haul Railway (Central South University), Changsha 410075;4 Henan Co. Ltd. of Zhengzhou-Wanzhou Railway Passenger Dedicated Line, Zhengzhou 450016; 5 Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650504)
Abstract Based on the Qifengshan tunnel on the Zhengzhou-Wanzhou railway, field tests and the 3D dynamic nu? merical simulation method are adopted to study the propagation law of the blasting vibration of the cut hole under the conditions of axial uncoupled charge with the air medium and water medium. The attenuation features of the vibration velocity of the primary support at different distances and positions at the rear of the working face are compared and analyzed. The results show that: 1) the peak vibration velocity at the vault caused by upper bench blasting is the highest and the peak vibration value at the haunch is second highest, with the smallest vibration velocity occuring at the side wall under the same distance from the blasting center; 2) it′s not safe when the measurement results of side wall vibration are adopted to optimize the largest charge for upper bench cut blasting; and 3) for the case of the same total charge of the cut hole, the blasting vibration velocity under axial uncoupled charge with water medium is less than that of the air medium.
Abstract：
Based on the Qifengshan tunnel on the Zhengzhou-Wanzhou railway, field tests and the 3D dynamic nu? merical simulation method are adopted to study the propagation law of the blasting vibration of the cut hole under the conditions of axial uncoupled charge with the air medium and water medium. The attenuation features of the vibration velocity of the primary support at different distances and positions at the rear of the working face are compared and analyzed. The results show that: 1) the peak vibration velocity at the vault caused by upper bench blasting is the highest and the peak vibration value at the haunch is second highest, with the smallest vibration velocity occuring at the side wall under the same distance from the blasting center; 2) it′s not safe when the measurement results of side wall vibration are adopted to optimize the largest charge for upper bench cut blasting; and 3) for the case of the same total charge of the cut hole, the blasting vibration velocity under axial uncoupled charge with water medium is less than that of the air medium.
.3D Numerical Simulation of Tunnel Blasting Vibration Laws under Axial Uncoupled Charge with Water Medium[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(2): 96-102
2018, Vol. 55 