Bridges and tunnels are good solutions to transportation problems in large cities separated by large rivers. In bridge construction great success has been achieved in China, but large-sized immersed tube tunnel constr...Bridges and tunnels are good solutions to transportation problems in large cities separated by large rivers. In bridge construction great success has been achieved in China, but large-sized immersed tube tunnel construction is still new. Element immersing is an important process of immersed tube tunnel construction. The accuracy of tunnel element positioning directly determines the quality of tunnel construction. In order to study the behavior of elements during its lowering to the sea bed, the experiments carried out in the State Key Laboratory of Ocean Engineering of Shanghai Jiaotong University. In consideration of the construction experience abroad and by reference to published papers on the Oresund tunnel in Norway-Sweden and Tokyo Bay tunnel in Japan, an element model to an appropriate scale is developed. A concise description of the model experiment wave environments is carried out, and the feasibility of two immersing strategies is studied.展开更多
Immersed tunnel is an important part of the Hong Kong–Zhuhai–Macao Bridge(HZMB) project. In immersed tunnel floating, translation which includes straight and transverse movements is the main working mode. To decide ...Immersed tunnel is an important part of the Hong Kong–Zhuhai–Macao Bridge(HZMB) project. In immersed tunnel floating, translation which includes straight and transverse movements is the main working mode. To decide the magnitude and direction of the towing force for each tug, a particle swarm-based translation control method is presented for non-power immersed tunnel element. A sort of linear weighted logarithmic function is exploited to avoid weak subgoals. In simulation, the particle swarm-based control method is evaluated and compared with traditional empirical method in the case of the HZMB project. Simulation results show that the presented method delivers performance improvement in terms of the enhanced surplus towing force.展开更多
沉管法是建设水下大型隧道工程的重要工法。因此,沉管浮运是一项至关重要的任务。目前研究大都只考虑静态环境下的沉管浮运,但是实际的沉管浮运往往是一个动态多目标优化问题。为此,论文建立沉管浮运动态多目标优化模型。在该模型中,将...沉管法是建设水下大型隧道工程的重要工法。因此,沉管浮运是一项至关重要的任务。目前研究大都只考虑静态环境下的沉管浮运,但是实际的沉管浮运往往是一个动态多目标优化问题。为此,论文建立沉管浮运动态多目标优化模型。在该模型中,将沉管浮运的效率、安全性、鲁棒性作为三个目标。其次,根据实际情况将浮运方向和水流流速作为模型动态变量。最后,使用基于并行计算和滑动时间窗的动态多目标优化算法来对其进行求解。实验结果表明,相比于新近提出的知名动态多目标进化算法,基于并行计算的滑动时间窗(sliding time window based on parallel computing,STW-PC)方法可以辅助多目标进化算法得到更好解集;可以为动态环境下的沉管浮运提供有效决策支持。展开更多
The time domain responses of the tunnel element under wave actions during its immersion are investigated based on the linear wave diffraction theory. The integral equation is derived by using the time-domain Green fun...The time domain responses of the tunnel element under wave actions during its immersion are investigated based on the linear wave diffraction theory. The integral equation is derived by using the time-domain Green function that satisfies the free water surface condition in the finite water depth, and is solved by the boundary element method. The motion equations of the tunnel element are solved by the fourth order Runge-Kutta method. A comparison between the computed and measured results reveals that the numerical model can effectively simulate the motion responses of the tunnel element and the cable tensions when the motions of the tunnel element are within some limit. Taking the tunnel element of 100 m in length, 15 m in width and 10 m in height as an example, the computational results of the motion responses of the tunnel element and the cable tensions in different immersing depths are obtained under different incident wave conditions.展开更多
文摘Bridges and tunnels are good solutions to transportation problems in large cities separated by large rivers. In bridge construction great success has been achieved in China, but large-sized immersed tube tunnel construction is still new. Element immersing is an important process of immersed tube tunnel construction. The accuracy of tunnel element positioning directly determines the quality of tunnel construction. In order to study the behavior of elements during its lowering to the sea bed, the experiments carried out in the State Key Laboratory of Ocean Engineering of Shanghai Jiaotong University. In consideration of the construction experience abroad and by reference to published papers on the Oresund tunnel in Norway-Sweden and Tokyo Bay tunnel in Japan, an element model to an appropriate scale is developed. A concise description of the model experiment wave environments is carried out, and the feasibility of two immersing strategies is studied.
基金financially supported by the Ministry of Education of Humanities and Social Science Project(Grant Nos.15YJC630145 and 15YJC630059)the Natural Science Foundation of Shanghai Science and Technology Committee(Grant No.15ZR1420200)
文摘Immersed tunnel is an important part of the Hong Kong–Zhuhai–Macao Bridge(HZMB) project. In immersed tunnel floating, translation which includes straight and transverse movements is the main working mode. To decide the magnitude and direction of the towing force for each tug, a particle swarm-based translation control method is presented for non-power immersed tunnel element. A sort of linear weighted logarithmic function is exploited to avoid weak subgoals. In simulation, the particle swarm-based control method is evaluated and compared with traditional empirical method in the case of the HZMB project. Simulation results show that the presented method delivers performance improvement in terms of the enhanced surplus towing force.
文摘沉管法是建设水下大型隧道工程的重要工法。因此,沉管浮运是一项至关重要的任务。目前研究大都只考虑静态环境下的沉管浮运,但是实际的沉管浮运往往是一个动态多目标优化问题。为此,论文建立沉管浮运动态多目标优化模型。在该模型中,将沉管浮运的效率、安全性、鲁棒性作为三个目标。其次,根据实际情况将浮运方向和水流流速作为模型动态变量。最后,使用基于并行计算和滑动时间窗的动态多目标优化算法来对其进行求解。实验结果表明,相比于新近提出的知名动态多目标进化算法,基于并行计算的滑动时间窗(sliding time window based on parallel computing,STW-PC)方法可以辅助多目标进化算法得到更好解集;可以为动态环境下的沉管浮运提供有效决策支持。
基金supported by the National Natural Science Foundation of China (Grant No.50439010)the Key Project of the Ministry of Education of China (Grant No.305003)
文摘The time domain responses of the tunnel element under wave actions during its immersion are investigated based on the linear wave diffraction theory. The integral equation is derived by using the time-domain Green function that satisfies the free water surface condition in the finite water depth, and is solved by the boundary element method. The motion equations of the tunnel element are solved by the fourth order Runge-Kutta method. A comparison between the computed and measured results reveals that the numerical model can effectively simulate the motion responses of the tunnel element and the cable tensions when the motions of the tunnel element are within some limit. Taking the tunnel element of 100 m in length, 15 m in width and 10 m in height as an example, the computational results of the motion responses of the tunnel element and the cable tensions in different immersing depths are obtained under different incident wave conditions.
