Displacement analysis of submerged floating tunnel under combinedaction of underwater explosion shock and bubble pulsation(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2022年2期
- Page:
- 79-90
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Displacement analysis of submerged floating tunnel under combinedaction of underwater explosion shock and bubble pulsation
- Author(s):
- LUO Gang; GUO Zhengru; ZHANG Yulong; REN Yi; LUO Yinan
- 1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. School of Civil Engineering,Shaoxing University, Shaoxing 312099, Zhejiang, China
- Keywords:
- tunnel engineering; submerged floating tunnel; underwater explosion; shock wave; bubble pulsation; displacement analysis
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the displacement response of the submerged floating tunnel under the combined action of underwater explosion shock and bubble pulsation, the submerged floating tunnel was simplified into a continuous elastic support beam with damping anchor cable and movable elastic support. The motion differential equation was established based on Hamilton principle, and it was solved by Galerkin method and RungeKutta method with Mathematica. The established combined load model of shock wave and bubble pulsation and tunnel model were verified. The influencing factors such as proportional distance, inclination angle of explosion point, different detonation point depths, anchor cable parameters and pipe parameters were compared and analyzed. The importance of influencing parameters was deeply analyzed and reasonable suggestions were given. The results show that the combined effect of underwater explosion shock and bubble pulsation has a significant impact on the displacement response of the submerged floating tunnel system. Based on the theoretical calculation results, the maximum displacement in the Y direction is much larger than that in the Z direction, when the inclination angle of the explosion point is taken as the most unfavorable condition, and the change of the inclination angle of the explosion point has a great influence on the displacement response of the structure. With the increase of the detonation position, the proportional distance, the stiffness of anchor cable, the damping of anchor cable and the length of the tunnel, the maximum displacement of the tube in the middle of the span decreases, and the increase of the proportional distance and the stiffness of anchor cable has a good inhibitory effect on the displacement response of the structure. With the increase of cable spacing, the maximum displacement in the midspan of the pipe body shows an increasing trend, and the change of cable spacing has a significant impact on the structural displacement response. In the design stage of submerged floating tunnel, the selection of anchor cable stiffness and the arrangement of anchor cable spacing should be emphatically considered, so as to ensure the safety of the structure in the operation process. The analysis further shows that the continuous elastic support beam with damping anchor cable and movable elastic support model and combined load model of underwater explosion shock and bubble pulsation proposed are more in line with the actual operation situation and have good reliability. It has certain reference value for the design of submerged floating tunnel, in order to provide reference for the followup study of submerged floating tunnel. 1 tab, 19 figs, 35 refs.
Last Update: 2022-04-13