Dmitriy Malovichko

Dmitriy Malovichko
Institute of Mine Seismology

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36
Publications
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216
Citations

Publications

Publications (36)
Conference Paper
Full-text available
In October 2006 a serious accident happened in Berezniki-1 mine of the world’s second largest Verkhnekamskoye potash deposit. The integrity of the waterproof stratum which separates mine workings from aquifers was broken and an uncontrolled flooding of the mine had began. The accident resulted in the appearance of several potential problems associa...
Conference Paper
Full-text available
When investigating a large or damaging seismic event in a mine, it is possible to be in the situation where either a conventional source mechanism inversion technique is not applicable due to poor data or the interpretation of the inverted source mechanism in terms of a planar slip model does not appear adequate for the observed damage or geologica...
Conference Paper
Full-text available
A technique which makes it possible to improve the linear elastic stress model of a rock mass is suggested. It includes two components: (1) Misfit between the observed source mechanisms of seismic events and assumed stress state. The misfit is based on Coulomb Failure Stress and takes uncertainty of location and finite size of the sources into acco...
Conference Paper
Full-text available
An approach to assess seismic and ground motion hazard associated with scenario(s) of future mining is suggested. The key element of the approach is the modelling of expected seismicity using the Salamon–Linkov method (Malovichko & Basson 2014) and combining the catalogues of modelled and observed seismic events. The modelling domain is discretised...
Conference Paper
Full-text available
Numerous tunnels of the extraction and undercut levels of the Pilar Norte sector experienced violent damage on 24 December 2011. A seismic event with a moment magnitude of 2.4 was recorded by the mine-wide seismic system at the same time. It is difficult to explain the observed damage with peak particle velocities/peak ground velocities calculated...
Preprint
Full-text available
This paper considers dynamic fracturing of the rockmass surrounding a tunnel statically loaded by compressional stress as a possible source of seismic events in underground mines. This begins with two-dimensional dynamic modelling of failure for six plausible scenarios. In each case, the seismic source derived from these models has significant nega...
Conference Paper
The general theory for the description of seismic sources is briefly discussed. The effect of excavations on seismic radiation is considered. Expressions for seismic source mechanisms in terms of the geometrical and mechanical parameters of source processes are provided for the following cases: fault slip and shear failure in a confined environment...
Conference Paper
Highly stressed excavations in hard brittle rock may fail by self-initiated, triggered or dynamically loaded strainbursts (Moss and Kaiser 2021). The low-frequency part of seismic radiation associated with strainbursts is described by a crush-type seismic source mechanism with a significant negative (implosive) isotropic component and a ‘pancake-sh...
Conference Paper
A 1D model describing the response of unsupported or supported blocks or wedges of rock near an excavation to an incoming stress wave is presented. The model is based on a non-linear force-displacement relation which includes an elastoplastic positive branch (corresponding to displacement into the excavation) and an elastic negative branch (corresp...
Article
In underground mines, episodes of sudden inelastic deformation in the rockmass are often induced by mining and are therefore localized near the excavations. The seismic radiation associated with such deformation can be described by a point seismic source using a volume integral of the stress-free strain (or incremental plastic strain)—expression (1...
Article
Full-text available
Оценка сейсмической опасности в рудниках имеет ряд отличий от подобной оценки для тектонических землетрясений: a) в рудниках сейсмичность вызвана извлечением горных пород, что делает оценку опасности зависимой от планируемых горных работ; б) значительная часть сейсмических событий в рудниках имеет механизмы очагов, отличные от механизмов тектоничес...
Conference Paper
Full-text available
An approach to model seismicity induced by mining was proposed by M.D.G. Salamon and developed further by A.M. Linkov. We suggest a variation of Salamon-Linkov method that does not require a priori assumptions about sizes, orientations and locations of flaws, reducing the amount of input data. The algorithm places a 3D grid over the model domain an...
Article
Seismic networks operated in the mines of the Verkhnekamskoye potash deposit routinely register seismic events associated with mining. Intensive low-frequency (0.5 - 2 Hz) Rayleigh waves occur on the waveforms of s ome events (so-called "low-frequency" events). Classical seismological source model in the form of expanding shear crack does not repro...
Conference Paper
Full-text available
Verkhnekamskoye potash deposit (VPD) is the only exploited potash deposit in Russia. It is second in the world on reserves after the Saskatchewan deposit in Canada. The first mine at the VPD was brought into production in 1933. Intensive mining began in the middle of the 1980s, when 6 mines were in operation. Ores are extracted from potash beds at...
Article
Full-text available
Seismic events and pillar failures observed in two platinum mines in the Rustenburg area, South Africa, were nvestigated. We studied the sources of approximately 300 largest seismic events recorded in 2009. Moment tensors of these events were estimated from amplitudes and polarities of P- and S-waves. The inverted mechanisms contain isotropic implo...
Conference Paper
Full-text available
Seismic monitoring systems installed in mines record seismic signals from various dynamic processes – fracturing in rock mass, production and development blasts, impacts and vibration of machinery, etc. It is important to classify the recorded seismic events before doing most kinds of analysis of seismic data. For instance, the assessment of seismi...
Conference Paper
Full-text available
Seismic rock mass response to mining is somewhat different than processes leading to and resulting from tectonic earthquakes. The seismicity observed in mines is driven by extraction of rocks rather then tectonic forces. Loading is faster and an interaction of seismic sources with openings and blasting create a variety of source mechanisms. amage i...
Article
The paper addresses the methodic questions of arrangement and implementation of local temporal seismologic observations targeting research on karst. We describe an approach for the quantitative assessment of the feasibility for recording the seismic effect of dynamic phenomena accompanying the karst processes. The approach copes with the specific f...
Conference Paper
Full-text available
For over 13 years a routine seismic monitoring has been carried out at six of the mines in the world’s second largest potash deposit, the Verkhekamskoye, Perm region, Russia. The observed level of seismicity is rather low in the mines. On average about 1-2 events with seismic energies from 100 J up to 50 kJ are recorded daily. The seismicity doesn’...
Article
Full-text available
ISS International, ЮАР Введение В последние годы новым направлением в комплексе исследований, способствующих повышению безопасности и экономической эффективности открытых горных работ, ста-новится микросейсмический мониторинг. Данная разновидность мониторинга основана на представительной регистрации сейсмических колебаний от небольших актов хрупког...
Article
Full-text available
An approach to the description of the seismic effect related to dynamic processes in mines is proposed. In terms of this approach, the notion of an equivalent seismic point source is mathematically formulated in order to describe the low frequency part of the displacement field in the far-field zone. A method of estimating parameters of the equival...
Article
Full-text available
In May 2002, both active- and passive-source surface wave data were acquired using 4-channel arrays at six selected bridge sites in southeast Missouri. Processing of acquired data (increase of signal-to-noise ratio, estimation of phase velocities) was carried out and dispersion curves of Rayleigh wave phase velocities were constructed. Each fundame...
Article
Common characteristics of the seismicity in the Ural Region are considered. New approaches to control of natural and technogenic earthquakes are described. These approaches have become possible owing to the up-to-date seismological network of 6 digital seismic stations developed in the Western Ural. The data obtained during continuous 4 year monito...
Article
In May 2002, Spectral Analysis of Surface Wave (SASW) data were acquired at six selected bridge sites in southeast Missouri. Each acquired SASW data set was processed and transformed into a site- specific vertical shear-wave velocity profile to depths on the order of 60 m. The SASW shear-wave velocity data were compared to other geotechnical data t...
Article
Full-text available
Waveforms obtained during underground seismic activity monitoring at the mines of Upper Kama potash deposit (UKPD) exhibit an interesting structure. Intensive low- frequency (f < 4 Hz) wavetrains are found at the final parts of seismograms except for compressional (P) and shear (S) waves. Numerical modeling was carried out with the aim of clearing...
Article
Full-text available
Routine seismic monitoring in mines enables the quantification of exposure to seismicity and provides a logistical tool to guide the effort into the prevention and control of, and alerts to, potential rock mass instabilities that could result in rock bursts. One can define the fol-lowing five specific objectives of monitoring the seismic response o...