南水北调中线一期工程总干渠高地下水位渠道设计主要问题及对策措施

Main problems from design of channel with high groundwater level for main canal of Phase I of Mid-Route of South-to-North Water Transfer Project and their countermeasures

高地下水位的处理是南水北调中线一期工程总干渠渠道设计中的主要技术问题。对挖方较深和渠基透水性较强渠段,这一问题尤为突出。本文以总干渠陶岔至沙河南段、黄河北至羑河北段的部分渠段为例,对高地下水位渠道存在的主要问题、处理方法及原则进行了分析,对南水北调中线一期工程总干渠所涉及的主要对策措施进行了介绍,主要包括:(1)逆止阀自流内排;(2)水泵抽排;(3)换填结合排水法。

The high groundwater level is a main problem to be treated with during the design of the channel for the main canal of the phase I of the Mid-Route of the South-to-North Water Transfer Project and it is particular prominent for those channel sections to be deeply excavated or deal with the foundations of strong permeability. By taking the part channel sections of the main canal from Taocha-section to the section of the south of Shahe River and the section of the north of the Yellow River to the section of the north of Youhe River as the study cases,the main problems from the channel with high groundwater level and the treatment methods with their principles are analyzed herein,and then the main countermeasures related to the construction of the main canal of the Phase I of the Mid-Route of the South-to-North Water Transfer Project are described as well,which mainly include(1) internal drainage with free-flow through non-return valve;(2) pumping drainage;(3) earth replacement combined with the relevant methods for drainage.