Experience in evaluating the quality of consolidation grouting of rocks by seismoacoustic methods at the Inguri hydroelectric station

Savich, A. I.; Yashchenko, Z. G.; Горбунов, А. А.

doi:10.1007/bf02379029

Hydrotechnical Construction

1977

DOI: 10.1007/bf02379029

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Experience in evaluating the quality of consolidation grouting of rocks by seismoacoustic methods at the Inguri hydroelectric station

A. I. Savich¹,

Z. G. Yashchenko²,

А. А. Горбунов³

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1981

2011

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Cited by 3 publications

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confidence: 99%

“…The method of controlling water ingresses is plugging-back oriented to dampproofing of the 1.5-2-m vicinity outside the shaft tubbing. Reliable plugging-back condition monitoring and the dampproofing quality control are required in this case [1].The annulus condition monitoring uses nondestructive geophysical examination techniques [2]. Acoustic measurements are obviously most effective for the tubbing quality control.…”

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Instrumentation and technology support of the acoustic monitoring in the vicinity of shafts

et al. 2011

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The paper presents the hardware and technology support for geophysical examination over the structure and conditions in the vicinity of shafts in a potassium salt mine. The details of multichannel linear observation design, acoustic data processing, and interpretation approaches to the detection of the potentially permeable zones are discussed.Safety of underground mine workings depends on many geological and engineering aspects, including conditions in shafts. Mine shafts operate continuously, which calls for specific precaution and prevention. We are focusing on the safety of shafts in water-soluble mineral formations, such as the 80-years-long operating mines at the Upper Kama Potassium Salts Deposit.The construction technology and design of shafts imply vicinity of the shafts being watertight, yet water entries appear regularly at the level of aquifers during the life of mines. The method of controlling water ingresses is plugging-back oriented to dampproofing of the 1.5-2-m vicinity outside the shaft tubbing. Reliable plugging-back condition monitoring and the dampproofing quality control are required in this case [1].The annulus condition monitoring uses nondestructive geophysical examination techniques [2]. Acoustic measurements are obviously most effective for the tubbing quality control. If a control object is largely velocity-heterogeneous, the classic acoustic measurement schemes and one-channel echosounding interpretation appear noninformative.Based on the most intelligent geophysical technique-seismic survey, a dedicated hardware and technology complex has been developed for the acoustic measurement implementation in the near zone of shaft vicinity, including a multichannel data acquisition system, adaptable processing graph and a collection of interpretative algorithms.Applicability of the classic seismic survey approaches in the acoustic frequency range depends on the "quasi-layered" structure of a shaft in plan-the tubbing, cement column, and the rock mass. This model is characterized with variable physical and geometrical parameters of its components. In the condition of the velocity and structure heterogeneity of the monitored geological and engineering objects in a mine, the acoustic measurements are the most informative within the common depth point technique (CDP). The frequency of the measurements, effective spatial processing of the recorded wave field, and the dynamic correlation of reflected waves contribute to that [3].Major advantage of CPD is the spreads of sources and receivers and their shifting in the course of data acquisition [4]. During the field seismic survey within the acoustic frequency range, numerical rating of the recording system parameters are aligned with the minimum and maximal depths of the target interval, frequencies of the reflected waves, and with the required resolution and performance capacity of the hardware used [5].

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Instrumentation and technology support of the acoustic monitoring in the vicinity of shafts

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“…They include works on determining the parameters of the zones of removal in the foundation pits of the Inguri and Ust-llim dams [9,13], investigating pit flanges at the Dnepr II hydrostation [I], checking the quality of grouting in the diversion tunnel and in the foundation of the Inguri arch dam [17] and at the site of the Chirkey hydrostation, and also certain works at foreign installations [14][15][16][17][18][19][20][21][22].…”

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Engineering geophysics in the construction of hydraulic structures

Savich¹

1981

Hydrotechnical Construction

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The design, construction, and operation of modern large hydraulic structures require a comprehensive study of the characteristics of the structure, properties, and state of the rock masses within which the engineering installations are located. In this case both the conditions of interaction of the structure with the geological environment and the possible changes in the properties of this environment due to various technogenlc (anthropogenic) factors should be established [2,7,19,20]. A considerable contribution to the solution of these problemsis being made and a still greater contribution can be made by methods of modern engineering geophysics, i.e., various geophysical methods (seismic, electrical, magnetic, nuclear, and others) being used for Solving special engineering and engineering-geologic problems [1][2][3][4][5][6][7][18][19][20][21][22].As an integral part of the total complex of survey works, these methods have already been used for a long time for obtaining additional information on the engineering-geologic~con-ditions of the construction sites of various installations. However, in recent years "engineering geophysics,being spurred on by the construction of extremely large hydrostations in fold-mountain regions under extremely complex seismogeological conditions, has acquired welldefined features of independence not only with respect to its techniques but also with respect to the character of problems to be solved, which in many cases are original, not accessible for traditional types of exploration. This can be referred mainly to the topics of study of rock masses as foundations, the surrounding medium, and sphere of interaction with hydraulic structures" (A. G. Lykoshin).With respect to the character of the problems being solved, three main directions, which for now have obtained a substantially different degree of development, were distinguished here [14,19].The first of the indicated directions is related to a study of the natural engineeringgeologic conditions of construction sites. It includes problems of three-dimensional schematization (mapping) of the investigated rock masses on the basis of various geophysical parameters and a determination of the properties and state of rocks in isolated structural elements (with establishment of the regularities of the spatial variability of these properties). Included here are problems of evaluating the initial seismic danger of construction sites with ;~ a determination of the parameters of possible seismic effects and places of possible occurrence of residual seismic deformations [18,19].The second direction is engaged in problems arising during construction of large struc, tures. Typical problems of this direction are the refinement of the parameters of the zone of removal in construction pits; determination of the zones of expansion and stress release in temporary tunnels and mine workings; check of the quality and effectiveness of injection (grouting) works; check of the quality of concrete in structures, etc. [19,20,23]. These investigation s dif...

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Detection of defects in a grout curtain by geophysical methods

Koptev¹,

Gorshkov²

1986

Hydrotechnical Construction

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Experience in evaluating the quality of consolidation grouting of rocks by seismoacoustic methods at the Inguri hydroelectric station

Cited by 3 publications

References 3 publications

Instrumentation and technology support of the acoustic monitoring in the vicinity of shafts

Instrumentation and technology support of the acoustic monitoring in the vicinity of shafts

Engineering geophysics in the construction of hydraulic structures

Detection of defects in a grout curtain by geophysical methods

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