高水头压水试验在引黄工程泵站中的应用

Application of High head Pressure Test in the Pumping Station of the YRDP

引黄工程总干一、二级泵站和南干一、二级泵站设计扬程均为１４０ｍ，若考虑特殊工况下的水锤作用，内水压力最大可达２１３ｍ，为了查明隧洞围岩在高内水压力下的稳定和抗力强度问题，并为优化隧洞衬砌形式提供有关地质参数，在上述四个泵站的勘探钻孔中，分别进行了高水头压水试验。

The design lift head of the primary and second stage pumping stations in both the General Main Line and the South Main Line is 140m,the internal water pressure may be up to 213m if the water hammer pressure under special working condition is considered.In order to clarify the stability of seepage prevention and destructiveness of surrounding rock of tunnel under high internal water pressure,the high head water pressure test is done respectively in the exploratory holes of the above four pumping stations.The test result shows that the pressure tunnel may be lined with reinforced concrete,but grouting measures should be surely taken in weak section of the surrounding rock.The writer takes it that the high head water pressure test may be regarded as a supplement and improvement of other methods such as core drilling,ground stress test and supersonic wave test according to the strong and weak points of each test.