Structural Drawing-Oriented Simulation Theory And Application Of Construction Diversion And Closure System

To solve the problems existed in construction diversion and closure system simulation at present such as hard modeling of simulation computation, poor transplantablity of program, separation between computation and data results, and difficult realization of simulation visualization, structural drawing-oriented simulation theory and method is presented in this thesis. On the basis of Matlab software, structural drawing-oriented simulation platform of construction diversion and closure system that includes simulation modeling, simulation visualization and verification and validation of simulation is constructed. By practical engineerings, validity of this simulation method and simulation platform can be verified. The main contents and achievements of the thesis are summarized as following:Firstly, the theory and method of structural drawing-oriented simulation of construction diversion and closure system is presented. Through describing state space of each element model of the system and then determining basic variables and their correlations, the correlation model between each element is constructed to assemble the structure drawing model of the system. By assembling structural drawing, simulation model of the system is constructed.Secondly, based on MATLAB, structural drawing-oriented simulation platform of construction diversion and closure system that includes simulation modeling, simulation visualization and verification and validation of simulation is constructed. Through dragging and assembling structure drawing, simulation modeling process is realized. Not only simulation computation can be completed, but also computation results can be visualized by including visualization of simulation computation into structural drawing. Through verifying and validating of each element, validity of simulation model can be verified and validated step by step and accuracy of verification and validation of modeling and simulation is improved.Thirdly, structural drawing-oriented simulation method is used to study the closure work of Changzhou water control project. By analyzing hydrological and hydraulic risk of construction closure system, stochastical variable is determined. Then the structural drawing of each element is constructed and simulation model of the system is assembled. Last hydraulic parameter of discharge closure gap, system risk probability and roughness sensitivity is presented for practical closure.Fourthly, structural drawing-oriented simulation method is used to study the diversion work of Nuozhadu hydropower station. By analyzing the dynamical characteristic and the property of inner elements of the diversion system, the system is divided into several elements. Then, the structural drawing of each element is constructed and simulation model of the system is assembled. Last, designed water-retaining level and graph of water level change during flood modulation and probability distribution of discharge capacity of diversion buildings is presented, and influence of roughness on discharge is analyzed, and risk probability of diversion system is presented.Fifthly, Study on removal time of multi-phase diversion cofferdam of Changzhou water control project. Hydraulic discharge models of three-phrase and five-section diversion of Changzhou water control project are classified into typical discharge modes and then they are combined to describe discharge conditions during each diversion period. The removal time of cofferdams is considered from three aspects, namely succeeding closure, water-retaining level and cofferdam filling. By analyzing all kinds of combination scheme, the best suitable cofferdam removal time and closure period are filtered on account of construction schedule. With 3D dynamic visual simulation technology, the proposed diversion scheme is displayed visually and intuitively.