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《Chinese Journal of Underground Space and Engineering》 2013-05
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Influence of Accidental Explosion of Upper Highway Tunnel on the Lower Water Supply Tunnel

Cai Lujun;Zhu Fangmin;Wu Liang;Han Fang;Peng Shen;Science College,Wuhan University of Science and Technology;Guang dong Hydropower Planning & Design Institute;  
The new highway tunnel goes through above the existed water supply tunnel to form crossing tunnels in space.The minimum clear distance between the upper and lower tunnels is 21.5m.A numerical simulation with ANSYS / LS-DYNA is conducted to evaluate the stability of the lower water supply tunnel by the accidental explosion of the upper highway tunnel.The results show that the vault and the haunch of the water supply tunnel have a great response on the explosive shock wave when the oil tank truck exploded on the upper highway tunnel in the process of transportation.The maximum vibration velocity is 10.1cm / s approximately,which is bigger than the safety vibration velocity of the hydraulic tunnel.The vibration velocities of the haunch and the arch bottom are 8.9cm / s and 3.9cm / s,respectively.The maximum dynamic tension stress is 1.01MPa in the vault of tunnel.With the addition of the lining static stress(about 1.0MPa) of the tunnel,the value surpasses the design tensile strength value of C25 concrete 1.27 MPa.Therefore,the accidental explosion of the oil tank truck can damage the structure of the water supply tunnel and have influence on its stability.It is necessary to take some traffic control measures.
【Fund】: 国家自然科学基金项目(51004079);; 湖北省交通厅基金项目(2012857216)
【CateGory Index】: TV672.1
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