基于SWMM和Infoworks CS的南湖路高排管涵改造工程水力模拟研究

发布时间：2019-06-11 12:24

【摘要】：长沙市南湖路位于长沙市雨花区，其道路下所埋设的高排管涵是该区主要的排水干管，主要收集南湖路以南，南郊公园片区的高区雨污水。现状为4x3箱涵沿书院路和水厂路敷设，出江口涵底标高为25.01米。在书院路和南湖路上有3个现状溢流井，井底标高为34.27米、34.2米、32.89米。但是随着湘江库区蓄水后，该高排管涵的出江口常水位高标变为29.81米和29.84米。原有的自由出流高排管涵系统由于涵底标高低于蓄水后的常水位，排水方式由自由出流变为淹没出流，片区降雨较大时，，高排管涵内形成雍水上的雨水有溢出地面的可能。该片区又主要为人口密集区和重要地区，如果不对原有排水系统存在的问题进行改造，会造成较大的经济损失。考虑到管网水力条件的特殊性和工程的特殊要求，为了给管网改造设计提供一定的技术决策依据和技术平台支撑，文章结合国内外工程实践经验和先例，利用计算机模型对南湖路高排管涵系统进行评估。采用InfoWorks CS和SWMM模型评估该管涵的改造前后不同条件下的出水情况。在模型的选择方面，由于InfoWorks CS采用的水力模拟内核主要采用静态稳定流内核，对于单一排水管网出口的模拟能够较好贴合工程实际计算值。而SWMM软件中的动力波动流及雨量计功能则被利用来评估改造后的管涵系统出流情况。通过利用两种不同模型的模拟优势，能够更为准确地得到贴近工程实际的模拟结果，为管涵的改造设计提供技术支撑依据。文章在利用SWMM模拟的同时对长沙市降雨过程线进行了预模拟，模拟对比结果显示利用SWMM校正之后的雨量计数值优于InfoWorks CS在暴雨强度的雨量模拟结果。研究表明，在湘江水位抬升以后，未改造之前的排水系统不能支持城市正常的雨水排放要求。根据InfoWorks CS的模拟结果，可以看出南湖路段大概5-7个检查井会超出排水负荷造成外溢。通过对原有排水系统进行改造设计，能够有效增加雨水管网的输水能力，也能够减少原有主管段的输水负荷。但因为水位抬高也能够造成管道内的旱时污水沉积物沉降堆积，造成管网堵塞，在后续工程实际中应加强排淤能力。
[Abstract]:Nanhu Road in Changsha City is located in Yuhua District of Changsha City. The high discharge pipe culvert buried under the road is the main drainage pipe in this area, which mainly collects rain sewage from the high area south of Nanhu Road and the park area of the southern suburbs. The present situation is that the 4x3 box culvert is laid along the Academy Road and Waterworks Road, and the elevation of the bottom of the culvert at the mouth of the Yangtze River is 25.01 meters. There are three overflow wells on Shuyuan Road and Nanhu Road, with bottom hole elevation of 34.27 meters, 34.2 meters and 32.89 meters. However, with the impoundment of Xiangjiang River reservoir area, the constant water level of the high discharge culvert becomes 29.81 meters and 29.84 meters. Because the elevation of the bottom of the culvert is lower than the constant water level after impoundment, the drainage mode of the original free discharge pipe culvert system changes from free outflow to inundation. When the rainfall is heavy in the area, Rain Water, who forms Yongshui in the high drainage culvert, may overflow the ground. This area is mainly populated area and important area, if the problems existing in the original drainage system are not reformed, it will cause great economic losses. Considering the particularity of hydraulic conditions of pipe network and the special requirements of engineering, in order to provide certain technical decision-making basis and technical platform support for pipe network reconstruction design, this paper combines the practical experience and precedent of engineering at home and abroad. The computer model is used to evaluate the high row pipe culvert system of Nanhu Road. InfoWorks CS and SWMM models were used to evaluate the effluent under different conditions before and after the revamping of the pipe culvert. In the aspect of model selection, because the hydraulic simulation kernel adopted by InfoWorks CS mainly adopts static steady flow kernel, the simulation of single drainage pipe network outlet can better fit the actual calculation value of the project. The dynamic fluctuating flow and rainfall gauge function in SWMM software are used to evaluate the flow out of the modified pipe culvert system. By using the simulation advantages of two different models, the simulation results close to the engineering practice can be obtained more accurately, which provides the technical support basis for the transformation design of pipe culvert. In this paper, the rainfall process line of Changsha City is pre-simulated by SWMM simulation. The simulation results show that the rainfall count value corrected by SWMM is better than that of InfoWorks CS rainfall simulation results in rainstorm intensity. The results show that after the water level of Xiangjiang River rises, the drainage system before transformation can not support the normal discharge requirements of Rain Water in the city. According to the simulation results of InfoWorks CS, it can be seen that about 5 wells in Nanhu section will overrun the drainage load and cause overflows. Through the transformation and design of the original drainage system, the water transportation capacity of Rain Water pipe network can be effectively increased, and the water transportation load of the original main section can also be reduced. However, because the water level rise can also cause the deposition and accumulation of sewage sediment in the pipeline during drought, resulting in blockage of the pipe network, the capacity of silting should be strengthened in the practice of subsequent projects.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU992.22

【参考文献】