南水北调倒虹吸工程水保措施配置及效果

Configuration Pattern and Effects of Soil and Water Conservation Measures in Inverted Siphon Engineering Area of South to North Water Diversion Project

[目的]探讨倒虹吸工程区水土保持措施配置模式及其效果,为调(输)水工程同类工程区水土保持措施布设提供参考。[方法]根据南水北调中线河南省郑州段倒虹吸工程实地调查和文献资料,确定针对主体施工三时段的水土保持措施布设,构建倒虹吸工程区水土保持措施配置模式,并依据实地调查资料及其照片,分析评价实施后的效果。[结果]以郑州段倒虹吸工程为例,依据工程布局、自然条件和施工工艺,结合不同时段水土流失特点确定水土保持措施:①施工前表土剥离,连同临时堆土分别集中堆放、拦挡、苫盖或撒播草籽;②施工区设临时铁质围挡与截、排水沟;③开挖边坡设截排水兼防渗沟并适时苫盖;④堤坝外至保护范围设生态景观区;⑤进、出口两侧渐变段设排水沟、框架植草护坡和三角形小型绿地;⑥作业管理区园林绿化并设排水、沉沙措施,停车场铺透水砖;⑦虹吸顶部建休闲生态园,构建成倒虹吸工程区水土保持措施配置模式,实施后取得较好效果。[结论]倒虹吸工程不仅是调水工程的重要组成部分,而且是南水北调中线一期工程中数量最多的一种交叉建筑物;按部位合理布设工程、植物、临时措施,构建水土保持措施体系,必定会取得较好水土保持和改善生态环境效果,并为同类工程编制科学、经济、安全、可行的治理方案提供参考。

[Objective] In order to provide reference for similar water transfer projects,the configuration pattern and effects of soil and water conservation measures in inverted siphon project were discussed.[Methods] According to the field investigation and documentary data of the inverted siphon project in Zhengzhou City section of the middle route of the South to North Water Transfer Project in He’nan Province,the layout of soil and water conservation measures in three main construction periods was determined,the configuration pattern of soil and water conservation measures in the inverted siphon project was constructed,and the effect after implementation was analyzed and evaluated according to the field survey data and photos.[Results] Taking the inverted siphon project of Zhengzhou City section as an example,soil and water conservation measures were determined based on the project layout,natural conditions,construction technology and the characteristics of soil erosion in different periods:① Surface soil should be peeled off before construction,together with temporary soil heaping,centralized stacking,blocking,covering or sowing with grass seeds;② Temporary iron fences,interception and drainage ditches should be set up in the construction area;③ Cut off drainage and anti-seepage furrow should be installed on the excavated slope and the tarpaulin should be timely covered;④ Ecological landscape areas should be set up from the dam to the protection area;⑤ Drainage ditches,frame planting grass slope protection and triangular small green space should be set up in the gradual transition sections on both sides of the inlet and outlet;⑥ Landscaping,drainage and sand sinking measures should be set up in the operation management area,and permeable bricks should be laid in parking lots;⑦ A leisure ecological park built on the top of the siphon become an allocation model of soil and water conservation measures in the inverted siphon project,which has achieved good results after implementation.[Conclusion] The inverted siphon project is not only an important part of water diversion project,but also a kind of cross building with the largest number in the first phase of the middle route of the South to North Water Transfer Project . The reasonable layout of engineering,plant and temporary measures according to the location and the construction of soil and water conservation measure system will certainly achieve better results on soil and water conservation and greatly improve the ecological environment,and provide a reference for similar projects to compile scientific,economic,safe and feasible scheme.