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Engineering and Mining Geophysics 2018
- Conference date: April 23-27, 2018
- Location: Almaty, Kazakhstan
- Published: 23 April 2018
141 - 149 of 149 results
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Dangerous Geological Processes in the Foothills of the Trans-ili Alatau
Authors B. Serikov, A. Auelhan, М. Zapparov and M. AlzhigitovaSummaryThe purpose of this research was the enhancement of hydrogeological and engineering-geological materials on dangerous geological processes in the foothills of the Zailiysky Alatau in order to study the patterns of development and activation of dangerous geological processes widely distributed in the described region and present a threat to the life of the population.
Further study of the territory and monitoring of the manifestation of dangerous geological processes should be carried out using the methods of remote sensing of the earth.
1. Review, analysis and evaluation of engineering-geological and hydro-geological studies conducted on the territory of the foothills of the Zailiysky Alatau.
2. Use of remote sensing materials in engineering geological mapping, in the study and monitoring of hazardous geological processes.
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Studies of the Conditions and Prospects for the Use of Electromagnetic Profiling in Monitoring the Groundwater Table and Salt Regime of Soils on Irrigated Lands
Authors E. Kuldeyeva, K.A. Anselm, V. Kulagin, E. Auelkhan, A. Makyzhanova and M. AlzhigitovaSummaryStationary hydrogeological supervisions on irrigable lands of the republic are executed in mining holes that are resource-demanding and expensive buildings. A more cost-effective way to determine the level and mineralization of groundwater is proposed, based on remote sensing methods. Experimental sites were located next to the existing observation wells to obtain further degree of reliability. Undertaken studies with the use of complex apparatus of midfrequency complete set of devices of the dipole electromagnetic profiling of –DEP - 2 gave positive results on the Tasotkelsk area, where the interpreted values, similar with the indexes of water-tables, actually measured in observant mining holes, are got. of the conducted research and determination of the correlation coefficient. The method of the dipole electromagnetic profiling with the apparatus of СЭМЗ allows on 90% to abbreviate the volumes of the field and химико-аналитических works, that for years exploitation of apparatus gave the large economy of material and labour resources to establishment.
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The Application of Crosshole Seismic Testing (CST) and Seismic Cone Penetration Test (SCPTu) for Building the Detailed Model of the Medium in the Design of Highly Sensitive Facilities for Nuclear Construction
Authors I. Galushkin, N. Ragozin and V. IgnatevSummaryCrosshole seismic testing (CST) is one of the most effective methods for designing highly sensitive facilities for nuclear construction and can be successfully applied both at the survey stage and after commissioning. On the example of geophysical investigations carried out at the prospective site of the NPP construction, the results of CST on pressure and shear waves are shown. The results of determining the dynamic parameters of soils (Young’s modulus, shear modulus, Poisson’s ratio) and their distribution in the inter-well space are presented. Also, the work shows the result of applying the technique for allocation the fields of incident and reflected waves obtained as a result of seismic cone penetration test (SCPTu) to a depths of 20–30 meters for the detailed layering of the geological section.
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Complex of Geophysical Methods During the Survey of the Underwater Diapir Volcano of the Taman Peninsula
Authors A.V. Kozlova, D.A. Korshunov and T.S. KlapyshevaSummaryThe possibilities of complex geophysical methods including magnet prospecting, hydroacoustic survey and continuous seismoacoustic profiling for the detection and identification of an underwater mud volcano on the example of an object, including in the Kerch Strait, as well as the specification of the geological reasons for the formation of this structure are considered.
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The Complex of High-frequency Borehole Seismic Methods for Detailed Study of Rock Massif
Authors A. Oshkin, V. Ignatev, A. Konkov and N. RagozinSummaryThe paper presents modern achievements in high-frequency borehole seismic survey. High frequencies allow to solve the main problem of shallow seismics - insufficient resolution due to an excessively long wavelength in comparison with the size of geological objects. The use of high-frequency borehole sources and corresponding receivers makes it possible to effectively use modern technologies to obtain a detailed structure of the section.
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Recent Approaches to Seismic Hazard Assessment for Critical/Unique Engineering Constructions
More LessSummaryAlong with source effects and path effects, local site effects are among the main factors defining parameters of strong motion. The effects of soil response during strong earthquakes have always received considerable attention in seismology, because most urbanized areas are located in river valleys, on soft sediments. Large cities, such as, Tokyo, Osaka, Kobe, Los Angeles, San Francisco, San Salvador, Caracas, Lima, Bogota, Kathmandu, Manila, Thessaloniki, Mexico city, and others are located in river valleys in seismic areas. The prevalence and significance of these effects stimulated numerous instrumental, theoretical, and numerical studies aimed at better understanding and quantifying of the effects. To date, seismology has developed methods for reliable evaluation of these effects.
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Application of geophysical methods to identify weakened zones in the dumps of potash industry
Authors A.A. Zhukov, A.M. Prigara, R.I. Tsarev and I.Yu. ShustkinaSummaryThe paper presents the results of applying geophysical methods to identify weakened zones in the dumps of potash industry. The complex of geophysical methods includes a reflection method by the procedure of common depth point with registration of p-waves, 2D and 3D electric tomography method. The performed work proves reasonability of seismic and electric tomography methods and shows their effectiveness for detection of caverns and other inhomogeneities in salt tailings pile massif. The experimental works have been carried out in one of Uralkali PJSC mines..
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2D ERT Data Inversion And The Resistivity Section Distortions
Authors I.N. Modin, V.A. Shevnin and T.V. YalovSummaryThe modern ERT includes computerized, multi-channel instruments and multi-electrode wire to collect the data, special techniques to obtain information about 2D structure of the geological section and special software. A main element of this technology is the automatic inversion, which transforms the observed electric field in one of the variants of the geoelectric section.
In some cases ERT gives errors in the depths and thickness of sub-horizontal boundaries; errors in the depths of the profile when changing the contrast of the laterals; detection of false local structures due to contrast inhomogeneities. These errors of the inversion put the question of the recognition of zones with this kind of distortion, identify artifacts and recommendations by ignoring false positives.
Three typical situations that lead to distortions in the results of ERT data inversion are investigated. There are significant anomalies in the resistivity section after inversion. The inversion results should be carefully analyzed each time and the final sections should be edited by the geophysicist in accordance with the knowledge of the geological section. The formal presentation of inversion data as the final result of electrical exploration must be considered unreasonable and false
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