【作者】 黄伟；

【导师】 钟登华；

【作者基本信息】 天津大学 ， 工程管理， 2007， 博士

【摘要】 针对目前施工导截流系统仿真中存在的仿真建模复杂、程序通用性差,仿真计算与数据生成过程相分离以及仿真可视化难以实现等问题,本文提出了面向结构图的施工导截流系统仿真理论与方法。基于Matlab平台,建立了集仿真建模、仿真可视化和仿真校验于一体的面向结构图的施工导截流系统仿真环境。通过工程实例,验证了此仿真方法和仿真环境的有效性。主要研究工作和研究成果如下:1.提出了面向结构图的施工导截流系统仿真理论与方法。对施工导截流系统中各环节系统模型的状态空间进行描述并确定环节的基本变量及其函数关系,建立环节之间的关系模型,形成系统的结构图模型。通过各环节结构图的连结、拼装,建立系统的仿真模型。2.基于Matlab平台,建立了集仿真建模、仿真可视化和仿真校验于一体的面向结构图的施工导截流系统仿真环境。在Matlab平台上,通过结构图的拖放和拼装,实现了系统仿真建模过程。将仿真计算可视化集于环节结构图,不仅能完成系统的仿真计算,同时可将计算结果可视化。通过对环节的校验评价,从局部到整体逐步校验仿真模型的有效性,提高了建模与仿真校验评价的准确性。3.采用面向结构图的仿真方法研究了长洲水利枢纽工程施工截流问题。通过分析施工截流系统的水文及水力风险,确定了影响其风险的随机变量。然后建立了系统各环节的结构图,拼装了系统的仿真模型。最后通过仿真计算,为工程施工截流提供了龙口过流水力参数、系统风险率和糙率的敏感度。4.采用面向结构图的仿真方法研究了糯扎渡水电站施工导流问题。通过分析导流系统的动态特征及内部环节的性质,将施工导流系统进行了环节划分。然后建立了各环节的结构图,拼装了系统的仿真模型。最后通过仿真计算,得到了围堰的设计挡水位、调洪过程水库水位变化曲线和泄流能力的概率分布,分析了糙率对泄流的影响并给出了导流系统风险率。5.以长洲水利枢纽工程为例,研究了分期导流的围堰拆除时间问题。针对长洲水利枢纽工程分期导流的过程,将三期五段导流产生的复杂泄流情况进行归纳,简化成典型泄流方式,通过组合进行描述。围堰拆除时间对后期工程施工的影响考虑了三方面因素:后期截流、大坝挡水和围堰填筑。通过分析各类组合方案,结合施工进度安排,筛选出最适合的围堰拆除时间和截流时段。最后,采用三维动态可视化技术,形象直观地表现了推荐方案的施工导流过程。更多还原

【Abstract】 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.更多还原