Informativity of borehole geophysical methods in choosing the location of the main structures of the hydroelectric power plant (HPP)

Authors

  • S. Deyneko Kyiv Institute of Engineering Surveys and Research "ENERGOPROEKT", Ukraine
  • S. Vyzhva Taras Shevchenko Kyiv National University, Ukraine
  • A. Bernevek Kyiv Institute of Engineering Surveys and Research "ENERGOPROEKT", Ukraine

DOI:

https://doi.org/10.24028/gzh.0203-3100.v39i3.2017.104027

Keywords:

vertical seismic profiling, seismic sounding, seismotomography, rock safety, zonal rock massifs

Abstract

To study the state of the rock massif on the territory of the HPP on the river Vele (Republic of Equatorial Guinea) geophysical surveys using vertical seismic profiling, inter-well seismic survey and inter-well seismic tomography are performed. On the basis of the data obtained, there are significant differences in the state of crystalline rocks on the left-bank and right-bank sections of the dam construction. On the right-bank part of the territory, rock is more secure (about 90 % of the inter-wellbore space under study is characterized by a longitudinal wave propagation velocity (VP) of more than 4,500 m/s. On the left bank, for approximately 70 % of the investigated soil thickness VP is more than 4,500 m/s. The rock safety index allowed to obtain a rapid assessment of the state of the rocks in the massif, the rock was divided into four subzones: A — very strong unloading effect with the disintegration of rocks to eluvium, B — a strong manifestation of unloading and weathering, C — a weak manifestation of surface weathering and a moderate Manifestations of unloading, D — rocks are almost non-weathering, there are only signs of linear weathering in subvertical tectonic disturbances and large cracks. According to the results of the inter-well seismic tomography performed, it is also established that the more disrupted rocks are characteristic of the left-bank part of the construction site. Taking into account the obtained data, the plan for the location of the main structures of the dam of the hydroelectric power station is clarified.

References

Hydroelectric power station Senje on the river. Vele in the Republic of Equatorial Guinea. Vol. 3. Book 2. Technical report on the results of field geophysical studies, 2013. Kiev: State Enterprise "KIIZI EP", 50 p. (in Russian).

Zinchenko V. S., 2005. Petrophysical fundamentals of hydrogeological and engineering-geological interpretation of geophysical data. Moscow: AIS Publ. House, 392 p. (in Russian).

Integrated engineering and geophysical research in the construction of hydraulic structures. Eds A. I. Savich, B. D. Kuyundzhich. Moscow: Nedra, 1990. 462 p. (in Russian).

Methods of compiling geostructural patterns (models) of rock massifs in the foundations of hydroconstructions: the manual for SNiP. 2.02.02-85. Leningrad: VNIIG Publ. House, 1991. 163 p. (in Russian).

Onishchuk I. I., Vyzhva S. A., 2017. Express assessment of the structure of the geological section of the territory of he location of hydropower stations by geophysical methods. Vestnik Kiyevskogo universiteta. Geologiya (76), ...—... (in Russian).

Published

2017-06-22

How to Cite

Deyneko, S., Vyzhva, S., & Bernevek, A. (2017). Informativity of borehole geophysical methods in choosing the location of the main structures of the hydroelectric power plant (HPP). Geofizicheskiy Zhurnal, 39(3), 15–25. https://doi.org/10.24028/gzh.0203-3100.v39i3.2017.104027

Issue

Section

Articles