【作者】 王生光；

【导师】 张土乔； 邵卫云；

【作者基本信息】 浙江大学 ， 市政工程， 2004， 硕士

【摘要】 为保持经济的可持续发展，保护环境，提高人民的生活水平，城镇的排污管道工程日益增多。为防止污水管道渗漏而导致污水外渗污染地下水资源和周边的环境，我国现行的规范规定，无压管道在竣工交付使用之前必须进行管道的严密性试验。闭水试验和闭气试验是无压管道进行严密性试验最常采用的两种试验方法。 闭水试验方法因其应用时间较长，目前已积累了较丰富的经验，但在闭水试验时，管道两端砌筑砖堵、抹防水层、养护、灌水浸泡，以及试验后的放水、砖堵拆除等繁杂工序，不仅费工、费时，而且消耗原材料，尤其是在缺水的地区以及顶管施工的无压管道，这些矛盾更加突出；因此，为满足迅速发展的市政建设需要，有必要探索新的检测方法，闭气试验就是其中一种，但是闭气试验目前还不完善，有待于进一步深入研究。 本文针对无压管道交付使用前必须进行严密性试验的现状，运用流体力学基本理论和三维非稳态紊流的有限体积模型，采用PHEONICS计算软件，数值模拟不同管径下不同漏水点的渗漏情况，模拟闭水和闭气试验时管道内部的压强场和速度场的变化，并分析计算结果，从中找出其变化规律。在闭水试验时，通过模拟沿管道长度方向上不同渗水点的流速的变化，以及得出窨井出口处的水位随时间的变化值，来判断管段中最有可能出现渗漏点的位置。在闭气试验时，可通过不同漏气点压力值的变化速度的快慢来判断最不利管段的位置。 本文利通过对无压管道闭气和闭水试验的数值模拟，对闭气和闭水试验时的渗漏规律有了进一步的认识，为今后无压管道的闭水和闭气试验提供一定的参考。更多还原

【Abstract】 In order to maintain the sustainable development of economy, protect the environment and improve the living standard of people, urban drainage systerm is developing fast and becoming complicated. To avoid the pollution of groundwater resource and adjacent environment caused by drainage pipe leakage, current criterion in our country stipulates that there must be a pressurization test before drainage pipes are used. Two commonly used methods of pressurization test of pipelines with free-surface in best common are close water test and close gas test.The method of close water test has been used for a long time, so richer experience has been achieved. However, it not only takes pains and time, but also consumes raw materials during the close water test because of miscellaneous working procedures such as bricklaying in the two ends of pipe, water-repellent layer plastering, maintaining and water offletting, brick-block backouting after the test, especially in the region short of water and some drainage pipe with prop-pipe construction. In order to satisfy the fast development of municipal construction, new detection methods should be developed. One of those new methods is close gas test, which is not perfect yet and needs further developed.In this paper, hydromechanical theories, three-dimensional unsteady turbulent finite volume model and PHEONICS software are adopted to simulate the pressure field and the velocity field of the drainage pipe in allusion to the actuality of the necessary pressurization test before being used. Then analyze the computational results and figure out the variational rules of pressure and velocity with different leakage location while close water test or close gas test is applied. In the simulation of close water test, varied profiles of velocity of flow are obtained at different leakage location along the detected pipe, the variety values of the water level in the check well are acquired with time, consequently the location of the leakage can be judged. In the simulation of close gas test, the location of most possible leakage of pipe is judgedaccording to the changing speed of gas pressure at difference leakage positions.We have further knowledge in the leakage rule according to the numerical simulation on close water test and close gas test of pipes with free-surface ,which will provide useful reference for close water test and close gas test of pipes with free-surface in the future.更多还原