RaA氡气、甚低频测试在复核某电站库首变形体边界中的应用

Application of Boundary Checking with RaA Radon,VLF Survey in Deformation and Fracture Mass of Reservoir Right Shore to an Electricity Station Dam

以西南某水电站库首右岸拉裂变形体为研究对象,根据现场的地形地貌,先从地质定性分析出发,初步确定拉裂变形体的上下游边界及前后缘边界。介于地质体的不均匀性及不可预见性,再在初步圈定的拉裂变形体上布置低线公路、高线便道以及纵线3条测线,通过RaA氡气、甚低频测试这2种科学手段加以测试。最后在室内进行数据整理之后,作出各测点氡气值柱状图和甚低频视电阻率图,并在其原理基础上结合地质情况加以量化评判,结果表明它与地质定性分析得出的边界情况基本吻合。可见,这2种测试手段为拉裂变形体的边界确定作出了较为充分的论证。

With the real project of reservoir right shore to an electricity station dam at southwest, and topography, geomorphology on the spot, beginning with geological qualitative analysis, we can initially ensure the upstream and downstream boundary, the front and back boundary of the deformation and fracture mass. According to the heterogeneity and something unknown of the geologic body, we located three measuring circuits which contain lower road, higher shortcut and ordinate on the boundary referred above, then we use two scientific ways of RaA radon survey and VLF survey to test. Ultimately we can get the every observation point radon columnar sections and the VLF apparent resistivity diagrams after coordinating the data in doors, and on the foundation of prineipium we quantitatively identified them with geological circumstances. As a result, the information we had gotten from those diagrams accorded with the boundary in geological qualitative analysis by and large. It is obvious that the boundary determination of the deformation and fracture mass was illustrated sufficiently on the basis of these two testing method.