上海市跨市管河道桥梁涉河影响论证要点分析

Analysis of Key Points for Demonstrating River-crossing Impact of Cross-city Pipeline and River Bridges in Shanghai

随着上海市基础设施建设的加速,越来越多的建设项目需跨越市管河道,为保证区域的防汛除涝安全,需对跨河的建设项目进行涉河影响论证分析。结合沪通铁路(二期)跨越大治河的惠南特大桥工程实例,从运行期及施工期两个阶段分析涉河影响论证要点。其中,运行期从规划符合性方面复核桥梁桩基的选址及结构,并利用规范中的经验公式复核保留护岸及新建护岸的稳定性;建设期通过MIDAS Civil及Plaxis等有限元软件复核施工过程中对保留护岸的影响,并通过实用水力学公式复核壅高水位。通过对涉河影响分析中的主要过程及计算方法进行分析,可为其他跨河建设项目在涉河影响分析中提供参考。

With the acceleration of infrastructure construction in Shanghai,more and more construction projects need to cross the municipal river channels.In order to ensure the safety of flood control and waterlogging prevention in the region,it is necessary to demonstrate and analyze the impact of river-crossing construction projects.Through the example of the Huinan Bridge crossing the Dazhi River in the Shanghai-Nantong Railway(Phase II)Project,the key points of the river-crossing impact are demonstrated and analyzed from two stages of operation period and the construction period.During the operation period,the site selection and structure of the bridge pile foundation will be reviewed from the perspective of planning compliance,and the stability of the retained and newly built revetments will be reviewed by using the empirical formulas in the specifications.During the construction period,the impact of the construction process on the retained revetment is reviewed through the finite element software such as Midas Civil and Plaxis.And the banked-up water level is reviewed through the practical hydraulics formula.The river-crossing impact is analyzed through the main process and calculation methods,which can provide the reference for analyzing the river-crossing impact in the other construction projects.