黄土类地层综合降水试验及优化设计

Integrated Precipitation Experiment and Optimum Design for Loess-like Layer

根据南水北调中线穿黄工程I标渠道及进口段场地水文地质条件,通过单井降水试验和生产性群井降水试验的降水资料,采取以管井为主,井点及明排为辅的综合性降水施工方法,成功地将渠道内地下水位降至基础设计标高以下。保证了渠道边坡稳定,达到了黄土类弱透水、高地下水位地层降水、渠道高边坡开挖和衬砌施工的目的。所得降水试验及设计成果为今后在类似地质条件地区的施工提供了可供参考的经验。

Based on the hydrogeologic conditions of the I stage channel and inlet portion of Cross Yellow River Project in Median-Line South-to-North Water Transfer Project,this experiment,with the data of the single well precipitation test and productive well-group precipitation test,has successfully made the underground water level in the channel down to the standard level required in the foundational design by using the comprehensive construction methods,which are based on the tubular well excavation method and supplemented with the well-point excavation method and drainage ditch.Meanwhile,the success of the experiment could also guarantee the channel＇s slope stability and reach the goals of the weak water permeability in the loess-like layer,high underground water level stratum precipitation,high slope digging and lining construction.The test results could provide the reliable and valuable experience for the constructions in condition-alike areas in the future.