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Date submitted2023-10-04
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Date accepted2024-09-24
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Date published2025-02-25
Crustal movement model in the ITRF2020 – a case study in Northern Vietnam
- Authors:
- Bui Thi Hong Tham
- Phi Truong Thanh
In the North area of Vietnam, the crustal movement velocity of 38 GNSS points belonging to different international Earth reference frames (ITRF2000, ITRF2005, ITRF2008) is adjusted to the international Earth reference frame ITRF2020. This is the latest frame up to now. Since then, the picture of crustal movement in the North area of Vietnam has been unified in a dynamic coordinate system. In the study area, the rate of crustal movement is about 35 mm/year, and the direction of displacement is from northwest to southeast. To build a model of the crustal movement of the Earth in the northern area of Vietnam, the movement velocity data of 38 stations in ITRF2020 is evaluated with high accuracy. All points are also satisfactory. And then, the crustal movement velocity model is built by using the collocation method in the form of the 3-order Markov function. Within 38 stations, 34 stations are used to build the model and 4 remaining stations are used as checked stations. The obtained results show that the Earth's crust movement velocity model has an accuracy of about 2 mm/year for movement velocity and 2 deg for movement direction. This is the first model of Earth's crust movement in the North of Vietnam that has been built in the latest dynamic coordinate system ITRF2020. These results have important significance in the research and practical application of the movement of the Earth's crust. The steps of building the movement velocity model in this study can be applied to other experimental areas in the territory of Vietnam.
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Date submitted2020-05-24
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Date accepted2020-07-23
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Date published2020-11-24
Estimation of ore contour movements after the blast using the BMM system
Measurement of ore movements by blast is one of the key components of the quality control system at any mining enterprise, which allows to obtain the accuracy necessary for determining the location of ore contours. About 15 years ago, a monitoring system was developed in Australia that allows mine personnel to make three-dimensional measurements of ore blocks movement at each blast. Studies have shown that ore blocks movement is extremely variable, and it characterized by a complete absence of a deterministic component. The consequence is that modeling ore contour movements during the blast will be inaccurate, and the best results for the mining enterprise can only be achieved by directly measuring the movement. The technology of measuring ore contours movements considered in the article is based on three-dimensional movement vectors obtained in different parts of the blasted block, characterized by different movements. It is obvious that the accuracy of determining the ore contours position after the blast is proportional to the number of measurements made on the block. Currently, the movement control technology based on the BMM system is actively used by global mining companies, its use reduces losses and dilution of ore. In 2017, the pilot implementation of the BMM system was started at the Olympiadinsky GOK, and the system is being implemented in several Russian mining companies.
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Date submitted2018-11-18
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Date accepted2019-01-17
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Date published2019-04-23
Calculation of elastoviscoplastic displacement of well walls in transversal and isotropic rocks
- Authors:
- A. G. Gubaidullin
- A. I. Moguchev
The relevance of the work is justified by the need to improve the technical and economic indicators of well construction based on forecasting and preventing drilling tools sticking due to the narrowing of an open well bore in the intervals of transversely isotropic rocks. A mathematical model of elastic-viscous-plastic displacement of the walls of inclined and horizontal wells has been developed during the narrowing of the open borehole due to rock creep in the intervals of transversely isotropic rocks. In the program developed based on this mathematical model, the calculation of the elastic-viscous-plastic displacement of the walls of an obliquely directed and horizontal well in the reservoir of argillite from the Western Siberia deposit was carried out. As a result of the calculation, it was established that after opening the rock with bits, the cross-section of the open borehole due to the rock creep eventually takes the form of an ellipse, the small axis of which is in the plane of the upper wall of the well and decreases with time.
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Date submitted2015-07-11
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Date accepted2015-09-17
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Date published2016-02-24
The mechanism of rock burst leading to ground destruction of mine openings
- Authors:
- M. G. Mustafin
The article deals with the main issues of studying of one type of rock bursts which lead to gound destruction of coal mine openings. The research is focused on rock burst prediction. Some cases of rock bursts are analised. The paper points out factors affecting this kind of rock failure. It also presents some simulation models and numerical examples. The results of the research show that it is possible to plan safe mining operations under different mining and geological conditions.
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Date submitted2014-12-09
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Date accepted2015-02-16
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Date published2015-12-25
Dynamic study of underground loading machine’s working tool crank-rocker mechanism
- Authors:
- I. P. Timofeev
- I. A. Korolev
The article is devoted to the dynamic study of the underground shovel’s working tool mech-anism, assembled in accordance with a crank-rocker scheme, containing curved wings, as well as to the study of the effect on uneven movement rate, produced by the working tool mechanism; pa-rameters and structural characteristics of the shovel paw design shape. On the basis of a synthesis of the loading machine’s working tool mechanisms, a kinematic scheme with a shovel paw, con-sisting of a straight operating part and a curved working tail, is offered. A dynamic model of the mechanism based on a variable weight of shovel bulk cargo and drive parameters of the working tool is developed, a motion equation is made up. Comparison between statistical indicators of effec-tive output obtained from the shovel loaders drive mechanism and the results of a separate computer simulation of the mechanisms under analysis attest to the proposed model’s performability.
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Date submitted2009-10-07
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Date accepted2009-12-22
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Date published2010-09-22
Providing of safe conditions for mining of shaftbottom protective pillars in deep ore mines at Тalnakh
- Authors:
- V. A. Zvezdkin
- A. G. Anokhin
- R. B. Galaov
Consideration is given to the causes complicating the mining of shaftbottom pillar and protection of shaft lining. The analysis is given to the formation of stress-strain state of the protective pillar and its enclosing rocks. Practical recommendations are given for control of deformation and stresses in the shaftbottom mass during extraction of protective pillars in deep ore mines at Talnakh.
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Date submitted2009-10-01
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Date accepted2009-12-02
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Date published2010-09-22
Specific manifestations of tectonic and seismic activity in Kuzbass
- Authors:
- A. I. Ekimov
- S. V. Tsirel
The conducted observations demonstrated the substantial growth and variation of nature of tectonic and seismic activity in Kuzbas. Growth of geodynamic risks is marked. Methods for study of observable processes are suggested.
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Date submitted2009-10-14
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Date accepted2009-12-11
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Date published2010-09-22
Investigation of present-day stress-strain state of rock mass by the results of observations at geodynamic polygons
- Authors:
- S. N. Savchenko
- E. V. Kasparyan
- Yu. G. Smagina
The methods are suggested for treatment of the results of optical distance and levelling measurements at the underground geodynamic polygons involving in their calculation the tensors of additional stresses and deformations, component of rotation and specific energy of deformability. As an example, consideration is given to changes in time of movements, deformations and specific energy of deformability at one of geodynamic polygons of the Kola peninsular.
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Date submitted2009-10-20
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Date accepted2009-12-11
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Date published2010-09-22
Monitoring of deformation processes of the earth surface with methods of differential interferometric treatment of radar data
- Authors:
- A. A. Krivenko
- Yu. A. Kashnikov
The Differential Interferometry SAR (DInSAR) has recently become one of the most popular methods to reveal and analyze the subsidence of the ground. This method is considered by researchers to be well suited to solve a problem of small relative ground shifts survey applying the short (centimeter) radio waves.
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Date submitted2009-08-05
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Date accepted2009-10-21
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Date published2010-02-01
The autoresonant electric drive of the swinging movement pendular vibration exciter vibration jaw crushers
- Authors:
- Yu. A. Gavrilov
- E. A. Zagrivnyi
To use of the autoresonant electric drive of swinging movement for creation of an oscillative motion of crushing jaws of vibrating jaw crushers it is offered in this article. The control system of the electric drive is developed. The results of imitating and physical modelling of the autoresonant electric drive are presented.
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Date submitted2009-07-17
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Date accepted2009-09-18
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Date published2010-04-22
Transformation of the form and angular parameters of rock movement processes with depth at ore deposits
- Authors:
- A. G. Shadrin
- M. A. Shadrin
It was established the increase of movement angles with mining depth and the mechanism of forming the stable natural arching in underground mining of ore deposits. The conditions and parameters of forming the stable natural arching were determined, under which the zone of dangerous deformations localizes inside the ore mass and does not manifest itself on the earth surface. The nomogram for analytical determination of the rock movement angles was developed, and the table was drawn up of the natural arching conditions with due account of main mining-and-geological factors of ore deposit occurrence and its mining.
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Date submitted2009-07-19
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Date accepted2009-09-11
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Date published2010-04-22
Calculation of supports of parallel workings divided with yieldable pillars at anthracite seams
The article presents the methods for calculation of supports of parallel workings divided with yieldable pillars at anthracite seams. Consideration is given to the development of experimental data card for protection and maintenance of paired conveyor entries with using the steelpolymer anchor supports.
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Date submitted2009-07-20
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Date accepted2009-09-20
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Date published2010-04-22
Problematic aspects in rock movement
The paper considers the existing standards in the field of rock movement and protection of engineer constructions from harmful influence of mining operations. It is emphasized the necessity in revision of some standards in compliance with the real mining production.