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用钻孔压水试验的方法来探求裂隙岩层的渗透性已为水工建筑基础地质勘探中水文地质工作采用的重要方法之一,正被普遍和广泛地利用着。按照“水利工程地质工作规范”在技经调查阶段所有的钻孔都应进行压水试验,其他勘察阶段也都有不同而且相当数量的规定,其应用之广由此可见。为了保证试验质量,试验的方法有很多的改进,目前最常用的是自流式供水,静水柱计压方法,但是它必须用两套管子进行。而我们国家目前管材缺乏,还不能大量供应满足需要,因而于专门打的钻孔中以岩心钻探所用的钻杆单独地进行试验仍须应用,由于它是以与其直径不同的接头相连接,水流经管内的变
It is widely and widely used to explore the permeability of fractured rock formations with the method of hydraulic pressure test of borehole, which is one of the most important methods for hydrogeological work in the geological exploration of foundation of hydraulic structures. According to the “Code for Hydraulic Engineering Geological Work” in the technical survey stage all the drilling should be carried out water pressure test, and other survey stages also have different and a considerable number of provisions, its wide application can be seen. In order to ensure the quality of the test, the test method has many improvements. At present, the self-flow water supply and hydrostatic pressure gauge are the most commonly used methods, but it must be performed with two sets of tubes. In our country, the current lack of pipe material, can not supply large enough to meet the needs of the drilling in the core to drill the core rod used in the separate tests still need to be applied, because it is connected with its diameter of the connector, the water flow Change within the tube