Simulation Study On Optimal Operation Strategy Of Drainage System Of Deep Tunnel In S Area Of Guangzhou

Guangzhou is one of the cities prone to waterlogging in China.S area is an important central area of the old urban area of Guangzhou.The high population density and ground hardening rate make the drainage basin have serious problems of waterlogging and overflow pollution during the rainy season.For this reason,Guangzhou carried out the technical and economic research on the drainage system of deep tunnels,and finally selected the s area watershed of Guangzhou as the test section of the deep tunnel construction project.The deep tunnel drainage system is the supplement and enhancement to the function of the shallow pipe network drainage system.In order to better realize the optimal use of the deep tunnel and the shallow pipe channel drainage system,to achieve the optimal control and to solve the problem of waterlogging and overflow pollution,finding the optimal dispatching operation and management suitable method for the drainage pipe network of the basin,it has important engineering significance and environmental benefits for the construction and application of deep tunnel engineering.In this paper,the 2D hydraulic model of S area watershed is established by using Info Works ICM software,and the model is verified by combining the measured data of watershed monitoring system.The watershed catchment area and the distribution of rainfall monitoring points are divided into 5 rainfall areas.The actual data of rainfall monitoring points and liquid level monitoring points were collected,and 11 rainfall events were simulated and verified by inputting the actual rainfall data and simulating and verifying the multi-point and district rainfall.The results of model validation show that the validation accuracy of 11 rainfall events is 81.8%,the validation accuracy of monitoring point level change is 84.3%,and the model is in good agreement with the actual drainage system.A method for optimizing dispatching operation of the shallow drainage pipe network combined with deep tunnels in the S area drainage basin was proposed,and the Info Works ICM hydraulic model was used to optimize the deep tunnel storage operation and drainage operation scheduling operation strategy of the S area drainage system.Based on the theory of decentralized control of large systems,the basin is divided into 9 subsystems according to the network map of the basin in the S area,the control range and distribution of adjustable facilities,and the target control points of each subsystem are determined by combining actual research and simulation results of the Info Works ICM hydraulic model.Based on the targetcontrol point simulation operation control effect,the basic operation strategy of deep tunnel storage operation and drainage operation of each subsystem is determined.Based on the real-time control theory of the pipe network and the water level value of the monitoring points in each subsystem,the logic diagram of real-time control operation strategy of T1 ? T6 subsystem under the operation of regulation,storage and drainage is built.Based on the Info Works ICM hydraulic model,the implementation effect of optimal dispatching operation strategy for deep tunnels in S area is studied.The research results show that the implementation effect of the optimal dispatching operation strategy of deep tunnels meets the construction goals of deep tunnels.In terms of waterlogging control,the optimized operation strategy for deep tunnels.After using deep tunnels to drain water,the risk of waterlogging in all subsystems is increased.The rainfall recurrence period has been increased from less than once in one year to once in 10 years.In terms of overflow pollution control,The optimal control strategy of the tunnel's optimal dispatching operation is significantly better than the current operation strategy.The overflow reduction rate is up to 49.27%.The optimal operation strategy of deep tunnel is to coordinate the shallow drainage pipe network and deep tunnel,which can not only effectively control the problems of waterlogging and overflow pollution in the river basin,but also give full play to the role of deep tunnels in the drainage system and achieve deep construction goals of tunnel engineering.