水电站地下洞室施工期湿环境及控制方法研究

发布时间：2018-02-16 01:37

本文关键词： 水电站地下洞室群施工期湿源除湿方式　出处：《西南交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：大型水电站地下洞室群主要由主厂房、主变室、尾调室、交通洞以及导流洞等组成,各洞室之间相互交叉,结构复杂且埋深较大,存在施工周期长、通风不畅、地下水渗漏及岩体散湿等特点,如果再遇到特殊的地质条件,将使隧道内形成高湿环境。而湿度过高会严重危害作业人员的身体健康,影响作业人员的工作效率,导致隧道施工不能安全有效的开展。因此,对隧道内湿环境及控制方法进行研究,具有重要的理论意义和工程实用价值。本文以在建大型水利工程—白鹤滩水电站地下洞室群工程为背景,针对施工期导流洞(尾水隧道)湿度较高的问题,对其湿环境和控制方法进行研究。首先通过现场调研,获取了水电站地下洞室群施工期的实际热湿环境及散湿源,分析了施工期水电站地下洞室群热湿环境的影响因素及物理过程,确定了水电站地下洞室群的主要散湿源,并根据理论分析,推导得出壁面散湿量随室内温湿度变化的计算公式；然后,通过实验测试与数值计算对比,建立了湿环境的计算方式及散湿边界条件的给定方法；最后,通过数值计算,分析了不同除湿方式、不同送风方式、不同送风状态及不同送风量等因素对施工期水电站地下洞室群掌头区湿环境的影响,并给出了施工期水电站地下洞室群掌头区宜采用的除湿方式及湿环境的计算和控制方法。本文建立的施工期水电站地下洞室群壁面散湿量的计算方法及给出的施工期水电站地下洞室群掌头区湿环境的计算和控制方法,可为实际水电站地下工程湿环境控制提供参考。
[Abstract]:The underground cavern group of large hydropower station is mainly composed of main workshop, main transformer room, tail-adjusting room, traffic tunnel and diversion tunnel. Each cavern intersects with each other, the structure is complex and buried deep, the construction period is long, the ventilation is not smooth, etc. The characteristics of groundwater leakage and rock mass dampness, if the special geological conditions are encountered again, will lead to the formation of high humidity environment in the tunnel. However, too high humidity will seriously harm the health of the workers and affect the working efficiency of the workers. As a result, tunnel construction can not be carried out safely and effectively. Therefore, it is of great theoretical significance and practical value to study the wet environment and control methods in the tunnel. Based on the underground cavern group engineering of Baihetan Hydropower Station, a large water conservancy project under construction, the wet environment and control methods of diversion tunnel (tailrace tunnel) during construction period are studied in this paper. In this paper, the actual thermal and wet environment of underground cavern group during the construction period of hydropower station is obtained. The influencing factors and physical process of thermal and wet environment of underground cavern group in hydropower station during construction period are analyzed, and the main source of moisture dissipation of underground cavern group of hydropower station is determined. According to the theoretical analysis, the formula for calculating the variation of wall moisture with indoor temperature and humidity is derived. Then, through the comparison of experimental test and numerical calculation, the calculation method of wet environment and the method of setting up the boundary condition of moisture dissipation are established. Through numerical calculation, the effects of different dehumidification modes, different air supply modes, different air supply states and different air supply rates on the wet environment of the underground cavern group in the construction period are analyzed. The method of dehumidification and the calculation and control method of wet environment for underground cavern group of hydropower station during the construction period are also given. In this paper, the calculation method of wall moisture dissipation of underground cavern group in hydropower station during construction period and the calculation and control method of wet environment of underground cavern group in hydropower station during construction period are established in this paper. It can be used as a reference for the control of wet environment in underground engineering of hydropower station.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV554

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