高拱坝浇筑仿真中大风影响与机械干扰问题研究

发布时间：2018-07-05 02:06

本文选题：拱坝浇筑 + 进度仿真　；参考：《天津大学》2014年硕士论文

【摘要】：高拱坝往往处于比较复杂的施工环境条件中,其施工过程受自然环境因素的影响较大。大风作为一种天气因素,在以往的施工仿真中,对其影响考虑的较少。但是,对于某些特定的地区,大风的影响不可忽略。大风不仅威胁缆机的安全运行,也会对浇筑进程产生较大影响;对于混凝土体量较大的拱坝,其往往布置多浇筑平台和多供料平台,缆机平台布置复杂,缆机之间的干扰对大坝浇筑所产生的影响较大,而以往的仿真系统中,往往是单平台的情况,对本情况考虑不足,因而对仿真的结果的精确度和可信度产生了影响。某水电站大坝位于金沙江河段特定地段,受地形条件以及气象条件影响,在每年12月至次年3月期间,局部风速很大。每年7级以上大风发生天数超过70天。该大坝浇筑入仓方案采用双层缆机平台和双层供料平台的方案,缆机台数为7台。该大坝缆机台数多、缆机平台和供料平台布置条件复杂,因而缆机运行、维修期间相互干扰非常大。本工程中,大风和机械干扰的影响不可忽略,以往的仿真模拟系统未充分考虑此类情况,因此需要深入研究大风和机械干扰对本工程的影响程度和相应的仿真策略。本文对高拱坝浇筑过程中的大风影响和缆机干扰因素进行了研究。探讨了大风天气对拱坝浇筑施工的影响,根据工程实际分析了以往仿真方法的不足,采用了扣除有效天数法和蒙特卡罗模拟法等三种方法对大风的分布规律进行研究,模拟大风天气对浇筑过程的影响,并设定了多个仿真方案进行对比和验证;详细介绍了高拱坝浇筑过程中缆机间存在的相互干扰问题,应用空间分析与冲突识别技术对其进行了研究。结合高拱坝浇筑仿真系统的研究现状,提出了适用于缆机单平台和双平台下处理缆机浇筑干扰与联合问题的模拟规则以及双供料平台的供料规则,并将其加入到拱坝浇筑仿真系统的仿真模块中;基于.NET平台C#语言和数据库等技术,开发出了高拱坝浇筑模拟程序,利用该程序对各方案进行模拟研究。分析了大坝的浇筑规律及各因素对大坝浇筑进度的影响情况,为进度计划的制定和未来工程实施阶段的工程控制提供必要的决策支持,同时也为今后复杂施工环境下的浇筑仿真研究提供了一些思路。
[Abstract]:High arch dam is often in complex construction environment, and its construction process is greatly affected by natural environment factors. As a kind of weather factor, the influence of gale is less considered in the past construction simulation. However, for some specific areas, the impact of strong winds can not be ignored. The gale not only threatens the safe operation of the cable machine, but also has a great influence on the pouring process. For the arch dam with large concrete volume, it often arranges many pouring platforms and multiple feeding platforms, and the cableway platform layout is complex. The interference between the cable crane has a great influence on the dam construction, but in the past simulation system, the single platform is often the case, which is not considered enough, so the accuracy and credibility of the simulation results are affected. The dam of a hydropower station is located in a specific section of the Jinsha River, which is affected by topography and meteorological conditions. From December to March of next year, the local wind speed is very large. The number of days of strong winds above magnitude 7 is more than 70 days each year. The construction of the dam adopts the double deck cable platform and the double layer feeding platform, and the number of cable machines is 7. Because of the large number of cable machines and the complicated arrangement conditions of the platform and feed platform of the dam, the operation of the cable machine is very disturbing during the maintenance period. In this project, the influence of gale and mechanical interference can not be ignored, but the previous simulation system has not fully considered this kind of situation, so it is necessary to study the influence degree of gale and mechanical disturbance on the project and the corresponding simulation strategy. In this paper, the influence of strong wind and the disturbance factors of cable machine during the construction of high arch dam are studied. The influence of gale weather on the construction of arch dam is discussed. According to the engineering practice, the shortcomings of the previous simulation methods are analyzed, and the distribution law of strong wind is studied by using three methods, namely, deducting effective days method and Monte Carlo simulation method. This paper simulates the influence of strong wind weather on the pouring process, and sets up several simulation schemes to compare and verify, and introduces in detail the mutual interference between the cable machines during the pouring process of high arch dam. Spatial analysis and conflict identification techniques are used to study it. Combined with the research status of high arch dam pouring simulation system, this paper puts forward the simulation rules suitable for dealing with the problems of cable machine pouring interference and joint under single and double platforms, as well as the feeding rules for double feeding platforms. Based on the C # language and database technology of .NET platform, the simulation program of high arch dam construction is developed, and each scheme is simulated by the program. This paper analyzes the pouring law of the dam and the influence of various factors on the construction schedule of the dam, and provides the necessary decision support for the formulation of the schedule plan and the engineering control in the future project implementation stage. At the same time, it also provides some ideas for the simulation research of pouring in complex construction environment in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV642.4

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