Influence of gas explosion in a utility tunnel on the structural safety of a undercrossing tunnel

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (8) : 160-166.

WANG Dai1,2，CHEN Changhao1，ZHANG Hai1,2，LIU Zhongxian1,2，MENG Sibo1,2

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Abstract

For the possible damage risk of the tunnel passing through the underground utility tunnel under the gas explosion, firstly, the overpressure time history of utility tunnel is determined through the field gas explosion test of underground utility tunnel, then the overall three-dimensional finite element model of utility tunnel, soil and undercrossing tunnel is established, and the load is applied to the inner wall of gas tank of utility tunnel to calculate and analyze the dynamic response law of undercrossing tunnel. The results show that the measured peak overpressure of gas explosion is as high as 0.63Mpa, and the duration of overpressure at both rising stage and descending stage is about 0.1s; The vault area of tunnel lining is impacted first, and the lining displacement increases with the increase of time, while the lining stress reaches the maximum at the peak of overpressure. The Mises stress of parallel undercrossing tunnel can be more than 3.5 times than that of orthogonal undercrossing; With the increase of the distance between the tunnel and the utility tunnel, the dynamic response of tunnel, such as lining stress and vibration speed, decreases gradually, and the decreasing trend is more obvious for the case of orthogonal undercrossing; Comprehensively considering the influence of various factors, it is suggested that the orthogonal undercrossing tunnel should be considered preferentially, and the safe spacing for the undercrossing tunnel should be greater than 7m. The research results can provide some reference for the anti-explosion design of utility tunnel and the engineering design of undercrossing tunnel.

Key words

Field test / Numerical simulation / Utility tunnel / Gas explosion / Undercrossing tunnel / Dynamic response

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WANG Dai1,2，CHEN Changhao1，ZHANG Hai1,2，LIU Zhongxian1,2，MENG Sibo1,2. Influence of gas explosion in a utility tunnel on the structural safety of a undercrossing tunnel[J]. Journal of Vibration and Shock, 2023, 42(8): 160-166

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