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13th Conference and Exhibition Engineering Geophysics 2017
- Conference date: April 24-28, 2017
- Location: Kislovodsk, Russia
- Published: 25 April 2017
41 - 54 of 54 results
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Separation of the Structural Elements of the Landslide Based on Seismic-Geoelectric Model of Landslide Slopes
Authors S. Burlutskiy and V. GlazounovSummaryEngineering of oil and gas pipelines at the hazardous landslide processes conditions requires a detailed study of the structure and properties of soils of landslide slopes. Application of modern tomography geophysics technologies extends capabilities to obtain representative information about the structure of the landslide. The seismic-geoelectric model of landslides which is presented in the report increases the efficiency of the use of geophysical methods. It provides a detailed study of landslide slopes in order to clarify and supplement data engineering and geological surveys.
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Engineering 3D Seismic Survey on the Potash Mine Territory
Authors A.G. Yaroslavtsev, V.Y. Bobrov and A.A. ZhikinSummaryThe exploitation of water-soluble mineral deposit is associated with the risk of accidental break of groundwater in the mine workings. In this regard, in addition to the mine loss, there is the problem of the stability of individual areas of the uppermost part of the section, which is the basis for the objects of industrial and civil infrastructure. The application of 3D seismic technology on such potentially dangerous areas can be economically and scientifically viable, because it makes possible to reconstruct the spatial position of the target reflectors more accurately and get three-dimensional representation of the object, that is not possible with two-dimentional seismic profiling. The article presents the results of assessment of capability for 3D seismic engineering research in geological aspects forecasting, that effect the safety of underground mining activity, within the productive salt mine at Upper Kama potassium and magnesium salts deposit.
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Some Aspects of the Theory and Practice of MASW
Authors N.A. Golyarchuk, E. Guberman, V. Mershchiy, F. Balakin and Y. YufaSummaryInterest in MASW (Multi-channel spectral analysis of surface waves) has grown over the last 15 years. The reasons for this interest lie in the awareness of the importance of determining the dynamic properties of the upper part of the section and in need for a simple and reliable enough method. The phase velocity of the surface wave SV-P in a layered model is a frequency function of the P-wave velocity, S-wave velocity, density and layer thickness. We have been studied MASW method in two versions: the classic version on the common shot seismograms and CMPCC modification. Synthetic examples demonstrate the effectiveness and stability of Vs and thickness calculation. In real data example, MASW results have been compared with the refraction wave method. MASW method can and should be used actively in the engineering seismic. In complex seismological conditions it is recommended to use MASW methodology on SH transverse waves. The resulting dependence Vs (z) agrees well with the refraction data. One should always keep in mind the non-uniqueness of the solution. Viewing and editing of automatically picked dispersion curves is the most difficult and important operation in all MASW procedure.
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Cross-Section Velocity Characteristics Determination by Seismic Acoustic Borehole Methods
Authors A.V. Chugaev, V.P. Lisin, I.A. Sanfirov, V.V. Nikiforov and V.P. ZeleninSummaryThere are concerning the results of experimental work seismic acoustic borehole methods to identify weak areas in the ground array and the top of the bedrock associated with undermining at the Verkhnekamskoe potash deposit. The main method of research is cross-hole seismoacoustic and reverse VSP, complementing previously conducted in this area shallow CMP seismic profiling method for monitoring, surveillance by broadside vertical profiling in geotechnical borehole, and the results of physical and mechanical analysis of core samples.
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Crosshole Seismic: Features of the Initial Models Design
Authors A.N. Oshkin, M.A. Shishkina and V.A. StruchkovSummary“Crosshole seismic (CS) survey is a reliable and informative method of investigation of geological media, being a leading and sometimes unique geophysical method in geological-engineering researches.
However, there is a pitfall in processing of CS data: correctness of result model urgently depends on the correctness of input data.
Examples of CS engineering researches are considered. The main aim is to investigate dependence of the results of first breaks tomography on the initial model choice. Use of homogeneous velocity model is shown to lead often to artifact results. It is necessary to consider all a priory information, including velocities, calculated for the pairs of sources and receivers at the nearly same depths, and different wave types. Presence of contrast velocity boundaries in the lower part of investigated media and, as a rule, the first break of the head waves is shown to result in incorrect definition of velocities in the upper part. To solve this problem, the 2-stage processing is suggested. First, it is carried out only for the upper part, dealing with direct waves. Then, inversion for the whole volume is performed, using in the initial model the result of the first stage. The approach is verified by numerical modeling.”
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Cross-Hole Shooting on Longitudinal and Shear Waves: an Example of Effective Usage of the Method
Authors A.N. Oshkin, N.A. Ragozin, V.I. Ignatev, A.I. Konkov and R.Y. ErmakovSummaryThe paper describes an example of the implementation of cross-hole shooting for pressure and shear waves at the site of proposed construction of Nuclear Power Plant “Paks-2” (Hungary). The correponding research was carried out by specialists of Institute «Orgenergostroy» (Moscow, Russia) with technical support of LLC “Geodevice” (Saint Petersburg, Russia). Based on the comparision of combined seismograms it was concluded that method had demonstrated the best results at distances between wells 25–27 m.
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GPR Survey of Structural Layers of a Road Tunnel Carriageway
Authors V.A. Yavna, K.M. Ermolov, V.L. Shapovalov, M.V. Okost and A.V. MorozovSummaryA method for determining the refractive indices of the structural layers of road tunnel carriageways in the microwave range (1200–1700MHz) is proposed. The method is based on the processing of the GPR data. The method is employed to study the thickness of structural layers and to determine the invert volume moisture. We propose a GPR experiment and the GPR data processing method for determining the refractive index of layered structures in general.
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The Study of Soil Electrical Resistivity Changes According to the Electrical Electrometric Monitoring Results Near Volokolamsk
Authors I.N. Modin, M.I. Bogdanov, M.A. Kompaniec and A.B. SimonovSummaryThe two-piece array was used to observe resistivity changes during 2 months. There are 10 current electrodes AB in the first segment and 10 measuring electrodes MN in the second segment. The AB line is established parallel to the MN line. The distance between the two lines is about 2.5 m. The electrode step is 1 m. 45 combinations of AB electrodes and the 9 MN dipoles were used during the current generation. Each measurement was repeated 3 times. Thus a single cycle (shoot) consisted of 1215 measurements. Shoots were repeated every 3 hours. All receiver electrodes are provided with digital thermometers. The beginning of the measurements was in a warm weather with temperature +5C. The end of the measurements took place, when the temperature dropped be-low −10C. The monitoring results show that after the formation of the snow cover real values Umn/Iab are independent from air temperature. However, there is a stable inverse relationship Umn/Iab with electrical field sensor temperature.
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GPR Monitoring of the Process of Strengthening the Railway Track Ballast with a Polymer Binder
Authors V.A. Yavna, A.A. Kruglikov, Y.M. Ermolov and V.L. ShapovalovSummaryThe work reports on the GPR technology for determining the thickness of geocomposite formed in the railway track ballast shoulder upon polymerization of two-component polyurethane-based binder «RT-CS-001» introduced into ballast material.
It is shown that when the ballast voids are not filled with the polymer, visible depth of the contrast lower boundary of the ballast layer on a radargram is proportional to the thickness of the geocomposite formed.
Thus, the thickness of geocomposite can be determined by GPR using predetermined refractive indexes of ballast material and geocomposite.
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Improvement of Interpretation of the Monitoring Data Electrical Investigation by Means of the Theory of Estimates
Authors L.A. Hristenko, A.V. Kichigin, E.I. Parshakov, K.N. Shiryaev, Y.I. Stepanov and A.A. TainickiySummaryWithin the potentially hazardous area, on Verkhnekamskoe Deposit of salts, was performed detailed studies by the methods of the natural electric field and of the symmetric electric profiling. Qualitative interpretation of data the natural electric field and of the symmetric electric profiling implies the ambiguity of the conclusions on the existence and nature of the phenomena causing the variation in the observed parameters. For a clearer allocation of hidden patterns field amplitude changes previously were performed fast wavelet transform discrete values of the apparent resistivity. Statistical characteristics of parameters of geoelectric methods and the classification of multidimensional data on formal grounds will give the opportunity provide to increase the reliability of allocation zones geological complications
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Seismic CDP Profiling in Wells
Authors I. Sanfirov, A. Babkin and T. BaybakovaSummaryWell seismic observations procedure with using CDP acquisition system was proposed. Shot and receiver lines are in different special wells, well sparker is using. Main target in wave field is reflections moving in horizontal direction. It is assumed that these reflections connect with local vertical inhomogeneities. Vertical direction fracture zones are in water protective pillar of potash deposit for example. Results of such kind observations for one of the earth surface fast subsiding area on flooded salt mine territory are presented.
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The Test Results of the Seismic Monitoring Systems State of Stability of the Rock Mass in the Process of Construction of Road Tunnels in China
Authors V.B. Pisetski, R. Huang, Y.V. Patrushev, A. E. Zudilin, I.V. Schneider, M.P. Shirobokov and V.Y. BalakinSummaryThe report discusses the results of the test systems seismic monitoring of rock mass in the process of penetration road tunnel in China. Test system MIKON-GEO (LLC Ingorteh, RF), TRT 6000 (Procedia Engineering, USA, China), TST 303 (Amberg Measuring Technique, Switzerland). According to the results made all the systems tests forecasts to detect karst cavities and therefore the water saturation of the array at a distance of 200 m ahead of the tunnel face. After the tests, carried out excavation of the tunnel and made conclusions on the reliability of forecasts, the advantages and disadvantages of test systems and data processing methods.
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Concept, System Solutions and the Results of Geotechnical Monitoring and Forecasting of Hazardous Geodynamic Phenomena in the Processes of Underground Mining
Authors V.B. Pisetski, S.V. Kornilkov, A.D. Sashurin, E.S. Lapin, S.E. Lapin and V.Y. BalakinSummaryThe problem of the establishment of effective monitoring systems and forecasting of dangerous dynamic phenomena in the rock mass in the process of underground construction. A promising approach to building security systems of mining is associated with seismic and air and gas resources assessment of the structure and parameters of the stress-strain state of the rock mass.
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Highway State Examination Based on Combined Application of Capacitive Coupled Electrical Resistivity Tomography and Ground-Penetrating Radar
Authors D.A. Lalomov and V.V. GlazunovSummaryКомплекс геофизических методов в составе георадиолокации и бесконтактной электротомографии рассмотрен в рамках решения задачи по обследованию автодорог. Выбор данного комплекса обосновывается результатами опытно-методических работ, выполненных на участке новой автодороги с асфальтовым покрытием. Показана эффективность выполнения георадиолокационого зондирования для перехода от временного георадиолокационного разреза к глубинному в условиях отсутствия априорной информации о разрезе. Результаты опытно-методических работ показывают, что комплекс электроразведочных методов, включающий электротомографию и георадиолокацию, помимо информации о строении автодороги, позволяет получать ценную количественную информацию о ее состоянии на основе расчета электрофизических параметров добротности и УЭС.
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