【作者】 刘金飞；

【导师】 王仁超；

【作者基本信息】 天津大学 ， 水工结构工程， 2007， 硕士

【摘要】 大型堆石坝的坝体填筑施工是一个复杂的系统,涉及到期望工期、坝体上坝道路布置、料场开采与存储规划、坝面作业的施工组织方式与作业空间大小、施工机械类型与运行参数以及环境因素如降雨影响、气温、水文条件等诸多因素。如何采用科学的系统分析方法和先进的仿真技术手段,系统地研究各种影响因素的制约关系,合理地规划各个填筑时段的填筑面貌和施工强度,真实贴切地反映填筑施工过程,从而为分析施工条件对填筑施工的影响、指导实际施工提供依据,对于保证工程质量、降低工程造价和加快施工进度有着重要的意义。本文首先系统地分析了填筑分期分区优化问题主要影响因素的影响机制,综合考虑其中的坝面作业方式、坝面空间大小、施工机械等因素,提出填筑可达强度的概念,作为优化的一个重要指标。以满足约束条件下的各期填筑强度不均衡度最小为优化目标,根据各影响因素对填筑分期规划的制约关系,建立了堆石坝填筑分期分区优化模型,引入并改进群集智能优化算法以求解该优化模型。以提出的模型和算法为基础,利用Visual C#平台开发了高心墙堆石坝填筑分期优化软件(OSFD-nzd)。在分期分区优化的基础上,通过对堆石坝填筑施工的系统分析,以降雨约束、高差约束、日上升高度约束、心墙填筑次序约束等形成填筑上升规则,依据计算机仿真原理建立填筑施工仿真模型并开发了填筑施工系统仿真软件。仿真模型综合考虑了施工工艺和施工组织管理等方面的因素,突出反映心墙区各种材料的填筑次序和填筑过程,加深了描述问题的深度,能更加真实地反映填筑施工过程面貌。最后,针对糯扎渡工程实例,选择不同的施工条件和施工参数组合,设计了多组计算方案,运用OSFD-nzd系统进行分期分区优化计算,获得了较优的分期分区参数,并通过对比分析了各施工条件对分期分区优化的影响。根据分期规划结果,利用填筑仿真系统软件,模拟了在不同降雨条件下坝体填筑的填筑面貌和施工过程,为指导施工实际提供了合理的依据和参考。通过实例计算,验证了本文提出的方法的科学性和实用性。更多还原

【Abstract】 The construction process of large rockfill dam is a complex system. It involved many factors such as construction schedule, placement of dam access roads, filling workspace, arrangement of borrows, construction organization of workface, machines, etc. It also nearly related to environment factors such as raining, hydrology characteristic temperature, and so on. In order to reduce project cost and perform the project successfully and provide reference for decision-maker, it is necessary to study systemically all kinds of influence factors in substage-zoning filling design and to plan the construction visage of each stage and reflect realistically the filling process adopting scientific analysis method and advanced simulation technology.First, the affect mechanism of main factors which influence substage-zoning filling design problem was analyzed through the theory of system analysis and a new concept was presented for an important index, which denotes synthetically the influence of flow-shop scheduling mode, size of filling workface, construction machinery. Based on these analyses, an optimization model for dam filling programming was built which aimed to reduce the disequilibrium degree of filling intensity. In order to solve this system model, a mixed intelligent optimization algorithm was introduced and modified. Based on the model and the algorithm, an optimize software, namely OSFD-nzd, was developed on the Visual C# exploitation platform.Then, on the basis of filling programming and the analysis of dam construction system, the raise rules of filling layers was formed under the restricts of rain, altitude difference of neighboring fill zones, max raise height each day and filling order of core filling zone. Through the computer simulation theory, the simulation model and corresponding software is developed. It thinks over the factors of construction technics and construction management, and stands out the filling order of materials in core zone and the simulation results reflected distinctly the performance of real system.Finally, the theory present in this paper is applied to Nuozhadu project. Four calculation schemes with different construction parameters are designed to study the effect of the construction conditions to the filling programming. Furthermore, the filling simulation software is adopted to simulate the filling process. The simulation results of the scheme was offered to demonstrate the filling performance and filling process of under different rain conditions and provided reasonable reference for construction practicality. Consequently, the validity and practicability of the method presented in this paper were demonstrated.更多还原