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高精度测定渗透系数(K)的重要性不言自明,但是现阶段野外试验手段能够提供的关于K的信息不能满足高度非均质地层中污染物迁移预测模拟的需求。直接推进注入记录器(Direct-Push Injection Logger,DPIL)和直接推进渗透仪(Direct-Push Permeameter,DPP)是新发展的水文地质参数测量仪器,能够使K值的测定达到前所未有的分辨率和成本效益水平。工具向地下推进过程中,通过对注水量、注水压力和其它的水文地球物理参数的同步监测,直接推进技术(Direct Push,DP)能快捷准确地获得地层渗透系数的垂向分布。DP技术几乎适用于所有野外松散地层,并且对场地的干扰很小。因此,它克服了许多基于既有井的传统含水层测试方法的局限性。最近在美国MADE试验场的一个案例研究表明,使用DPIL/DPP可以获得空间分辨率达1.5cm的K值垂向分布。未来,高精度直接推进技术还可以与新一代的地球物理技术,例如高精度探地雷达相结合,以实现不同位置DP测定K值的互联以及整个试验场K值三维分布的确定。
The importance of high-precision determination of the permeability coefficient (K) is self-evident, but the information on K that can be provided by field tests at this stage of the present field does not meet the requirements for predicting migration of contaminants in highly inhomogeneous formations. Direct-Push Injection Logger (DPIL) and Direct-Push Permeameter (DPP) are newly developed hydrogeological parameter measuring instruments that enable unprecedented K resolution and cost Benefit level. Through the simultaneous monitoring of water injection volume, water injection pressure and other hydrogeophysical parameters, Direct Push (DP) can obtain the vertical distribution of formation permeability coefficient quickly and accurately. DP technology is suitable for almost all loose fields in the field and has minimal disturbance to the site. As a result, it overcomes many of the limitations of traditional aquifer-based testing methods for existing wells. A recent case study at the MADE test site in the United States showed that a vertical distribution of K values with spatial resolution of 1.5 cm can be obtained using DPIL / DPP. In the future, high-precision direct propulsion technology can also be combined with a new generation of geophysical technologies such as high-precision ground-penetrating radar to achieve the interconnection of K values at different locations DP and the determination of the three-dimensional distribution of K values throughout the test site.