西气东输工程湿陷性黄土塬坡地生态型水工保护研究

西气东输工程靖边-临汾段的黄土地区地形破碎,黄土以粉粒为主,结构疏松,黄土易于完全崩解,浸水后粒状架空结构体系迅速崩解,其抗冲蚀能力极差。本地区降水多为暴雨,强降雨形成的洪水来势猛、历时短,导致黄土塬坡地受水力侵蚀强烈且集中。工程项目区的生态环境脆弱,一旦植被遭到破坏,就可能造成生态系统的破坏。根据西气东输工程和区域的实际情况,进行了生态型水工保护工艺的现场试验研究。试验结果表明,该工艺完全可以达到传统水工保护工艺对黄土塬坡地处理所能达到的强度及效果,并且在管线及水工保护施工完成后将使生态基本得到恢复。

Study on Ecological Hydraulic Structure Protection in Jingbian-Linfen Area with Soak-to-Erosion Loess Tableland for West-to-East Gas Transmission Project

In the loess area from Jingbian to Linfen for West-to-East gas transmission pipeline passed, the terrain is fragmentary, and the loess is loose and mainly made up of flour particles. The anti-erosion ability of the loess is poor. The rainfall in this area is always rainstorm. The floods caused by rainstorms are fierce and rapid. The ecological environment in this area is flimsy. The ecologic system may be broken down in the case that vegetation is destroyed. According to the situation of West-to-East gas transmission project and the conditions of this area, the ecological hydraulic structure protection technique was applied in this area. The application results show that this technique can obtain the same effectiveness as the traditional hydraulic structure protection technology. The ecologic system can be restored basically after completing the construction of pipelines and ecological hydraulic structure protection engineering.