高地下水位渠段管、井相结合的复合排水及减压效果研究  

Research on the Composite Drainage and Pressure Reduction Effect of Combining Pipes and Wells in High Groundwater Level Canal Sections

作　　者：陈思涵 王兵 方攀博 韩延成[1] CHEN Si-han;WANG Bing;FANG Pan-bo;HAN Yan-cheng(University of Jinan,Jinan 250024,China;Shandong Provincial Water Transfer Project Operation and Maintenance Center Laizhou Management Station,Laizhou 261400,Shandong Province,China)

机构地区：[1]济南大学,济南250024 [2]山东省调水工程运行维护中心山东莱州管理站,山东莱州261400

出　　处：《中国农村水利水电》2022年第9期36-43,共8页China Rural Water and Hydropower

基　　金：国家“十二五”科技支撑计划(2015BAB07B02-6);山东省自然科学基金(ZR2017LEE028);山东省重点研发计划(2016GSF117038)。

摘　　要：在高地下水位渠段,明渠边坡容易产生扬压力破坏,造成衬砌板破坏、滑坡,甚至停水等严重事故。为降低地下水水位,提出在高地下水位地区采用纵向排水管与渠道内减压井相结合的复合排水方式。在常规条件下单纯采用纵向排水管排水,而在高地下水位情况下,启动减压井,使管、井同时运行,迅速降低地下水水位,避免造成扬压力破坏。针对山东省胶东引黄调水工程莱州趴埠段扬压力破坏问题,构建了三维有限元模型,解决了二维模型中难以同时模拟排水管与排水井的问题。采用数值计算方法对比了单纯采用纵向排水管、单纯采用减压井、管与井相结合3种模式下的排水减压效果,研究了减压井位置、井间距、井内抽水高程等对渠底及边坡的减压效果。结果表明,单纯采用排水暗管可以满足常规条件下的排水减压要求,而在高地下水位条件下无法满足。管、井相结合的复合排水方式,可满足排水减压要求,对长距离输水明渠高地下水位渠段的设计与运行提供理论支撑。In high water table canal sections,the side slopes of open channels are prone to lift pressure damage,resulting in serious accidents such as lining slab damage,landslides and even water stoppages.To reduce the groundwater level,this paper proposes the use of a composite drainage method combining longitudinal drainage pipes and in-channel pressure-reducing wells in areas with high groundwater levels.Under conventional conditions,the longitudinal drainage pipe is simply used for drainage,while in the case of high water table,the pressure-reducing well is activated so that the pipe and well operate simultaneously to rapidly reduce the groundwater level and avoid causing damage to the lifting pressure.A three-dimensional finite element model is constructed to solve the problem of simultaneous simulation of drainage pipes and drainage wells in a two-dimensional model for the lifting pressure damage problem in the Piaobu Section of the Jiaodong Diversion Project in Shandong Province.The numerical calculation method is used to compare the pressure reduction effect of drainage in three modes,namely,using only longitudinal drainage pipes,using only pressure-reducing wells and combining pipes and wells,and studying the pressure reduction effect of the location of pressure-reducing wells,the spacing of wells and the pumping elevation in wells on the bottom and slope of the canal.The results show that the drainage pressure reduction requirements can be met under conventional conditions by simply using drainage concealed pipes,but not under high groundwater table conditions.The composite drainage method of combining pipes and wells can meet the drainage pressure reduction requirements and provide theoretical support for the design and operation of high water table canal sections in long-distance water transmission open channels.

关 键 词：渗流模拟 排水降压 三维模拟 减压井 纵向排水暗管 联合排水 

分 类 号：TV68[水利工程—水利水电工程]