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2015. . No. 2(68) - Jun 2015, pp. 22-26

Electrical Resistivity Tomography Application for Exploration of Ground Hydraulic Structures and Their Bases

P. V. Kondratenko

Introduction. One of the components of hydraulic structures safe operation is inspection of filtration, temperature and humidity and hydraulic conditions in the structures, their bases and landfalls. During many years of operation some leakages, excessive filtration zones, underwater subsoil depositions, etc. are quite often arisen; their evolution is not possible to follow up with a fixed network of observation holes. In such cases integrated explorations are fulfilled, including geophysical operations.
Method. Main geophysical techniques for ground hydraulic structures exploration are electrical prospecting, seismic prospecting and GPR method, each in different modifications. For today one of the most informative electrical techniques is Electrical Resistivity Tomography.
Electrical Resistivity Tomography is an up-to-date version of the resistivity and induced polarization technique, intended for obtaining 2D and 3D resistivity sections, analysis of which gives the composition of the layer (rock types) and its condition (melt/frozen, aerated/water-inundated).
Rich experience of field observations with electrical resistivity tomography method has been by now accumulated by VNIIG employees at ground dams in Ezmin, Gizeldon, Dzaudzhikau (in the North Ossetian Republic), at the frozen dam on Pevek stream (Chukchi Peninsula), at the dam on Kuzminka river (Leningrad Region), etc. Along with field works we fulfill physical simulating in vitro for obtaining geoelectrical portraits of main types of ground dams, which is necessary for better interpretation of field materials.
Results. Explorations at abovementioned objects have given the information about melted rock propagation within the frozen type dam body and base (the dam on Pevek stream, Chukchi Peninsula), ground water depth, presence of local inhomogeneities within the dam body, positions of engineering-geological components.
Conclusion. Effectiveness of electrical resistivity tomography for solving the problems connected with explorations of ground dams and their bases may be estimated on the basis of different objects exploration results. Explorations with electrical resistivity tomography must be an integral part of every phase of hydraulic structures engineering-geophysical surveys – design, construction and operation.
Keywords: geophysics, dam, electrical exploration, electrical resistivity tomography
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