Methodology to detect and predict horizontal deformation at the Earth’s surface of adjacent rock mass blocks by GPS data

2021 ◽  
pp. 16-29
Author(s):  
V. A. Antonov
Keyword(s):  
Rock Mass ◽  
Gps Data ◽  
Horizontal Deformation ◽  
Adjacent Rock

scholarly journals STABILITY ASSESSMENT OF ADJACENT ROCK MASS IN THE DEVELOPMENT OF COALBED OUTLETS

2018 ◽  
pp. 51-59
Author(s):  
Olga G. Bessimbaeva ◽  
Elena N. Khmyrova ◽  
Farit K. Nizametdinov ◽  
Elena A. Oleinikova
Keyword(s):  
Rock Mass ◽  
Coal Seam ◽  
Active Phase ◽  
Geological Structure ◽  
Stability Assessment ◽  
South Side ◽  
Southern Side ◽  
The Stability ◽  
External Forces ◽  
Adjacent Rock

The problems of stability assessment of the quarry’s southern side during the development of the coal seam D6 are considered. To  assess the stability of the quarry’s southern side in the development  of coalbed outlets, modern research methods are applied: study of  the geological structure and analysis of the adjacent rock mass  state, the creation of an observation station and the production of observations, calculation of stability of adjacent rock mass of the  quarry’s south side and the research results analysis. Quarry’s south  side consists of clayey sediments up to 5 m, then siltstones and  mudstones up to 10-20 m and a coal seam with a capacity of up to  5 m. The substantiation of the calculated strength characteristics of  rocks composing the slopes of the quarry ledges, which determine the stress state of the slopes arising under the influence  of internal and external forces, is done. Instrumental observations of the laid station and the survey of cracks on the quarry’s side allowed  to determine the contours of the deformation zone and the  landslide prism size. A geomechanical model of adjacent rock mass  was created and the stability assessment was carried out for the  geological section along the line of the maximum development  depth. After additional loading on the quarry’s southern side slopes,  the safety factor of stability is nу = 1.69−173, which means active  phase termination of quarry’s side deformation and sustainable condition.

Moderate blasting technologies: Experience and prospects for introduction in Polyus mines

2021 ◽  
pp. 86-92
Author(s):  
R. A. Rakhmanov ◽  
◽  
V. N. Lushnikov ◽  
I. A. Alenichev ◽  
◽  
...  
Keyword(s):  
Rock Mass ◽  
Efficient Method ◽  
Dynamic Effect ◽  
Seismic Effect ◽  
Rock Fragmentation ◽  
Blast Design ◽  
Current Task ◽  
Mining Safety ◽  
And Control ◽  
Adjacent Rock

It is commonly known that rock fragmentation by blasting is the most economically efficient method to prepare large volumes of rock mass to excavation and handling. The drilling and blasting technology accepted by a mine governs both rock fragmentation quality and mining safety connected with slope stability. Therefore, optimization of drilling and blasting is an objective calling for the effective blast design and control. This article presents the main principles and methods of moderate blasting implemented at Polyus company towards minimization of impact on pit walls and benches. The main point is stagewise reduction of the dynamic effect exerted by blasting on rock mass when approaching the ultimate pit limits. Polyus company initiated the far and wide review and introduction of the best international practices for improvement of blasting operations near the ultimate pit limits. The article describes the activities undertaken within implementation of projects on drilling and blasting technology justification and improvement to enhance stability of pit walls and, as a consequence, to reduce geotechnical hazards. As a complimentary measure to abate seismic effect of explosions on adjacent rock mass, the nonelectric blasting is replaced by electronic blast initiation systems with more accurate delay intervals, which almost nullifies probability of simultaneous ignition of two or more charges and ensures, thereby, the acceptable and seismically safe modes of blasting of large rock blocks. Furthermore, the introduction of the electronic blasting cardinally changes the approach to blasting order and sequence per intervals in blast holes depending on the current task within a block to be blasted.

scholarly journals Deformation and Subsidence prediction on Surface of Yuzhou mined-out areas along Middle Route Project of South-to-North Water Diversion, China

2018 ◽  
Vol 10 (1) ◽  
pp. 834-843 ◽  
Author(s):  
Ding Renwei ◽  
Liu Handong ◽  
Yuan Guangxiang ◽  
Dong Jinyu
Keyword(s):  
Rock Mass ◽  
Stress Field ◽  
Fault Zone ◽  
Water Diversion ◽  
Field Change ◽  
Horizontal Deformation ◽  
Observation Network ◽  
Water Diversion Project ◽  
Caving Zone ◽  
North Water

AbstractThe Middle Route of the South-to-North Water Diversion Project crosses the coal mined-out area in Yuzhou city. There are 4 mined-out areas along Yuzhou section of the water diversion project. The collapse, fracture and deformation of overlying rock mass occurred due to strata loss and stress field change, which then resulted in the subsidence, collapse fissures on the ground. The deformation of the upper rock mass is characterized by “three-zone”: caving zone, fault zone, and bend zone. Thus, it is very important to predict the surface subsidence of the mined-out areas. Highly precise deformation observation network were set along the channel. The monitoring data show that the surface tilt, curvature and horizontal deformation of the mined-out areas were less than critical values. However, the forecast and monitoring values are relatively larger in Guocun and Xinfeng mined-out areas due to large mining range and the possible location of two mined-out areas in the affected region. Therefore, the monitoring should focus on the two mined-out areas.

Development of Technology for Filling Voids between Metal Frame Support and Adjacent Rock Mass by Foam Materials

2018 ◽  
Vol 54 (2) ◽  
pp. 237-247 ◽  
Author(s):  
Yu. N. Shaposhnik ◽  
A. A. Neverov ◽  
S. A. Neverov ◽  
A. I. Konurin ◽  
D. A. Shokarev
Keyword(s):  
Rock Mass ◽  
Metal Frame ◽  
Adjacent Rock

scholarly journals Monitoring of the stress-strain state of open pits’ adjacent rock mass

2020 ◽  
Vol 192 ◽  
pp. 04017
Author(s):  
Andrey Panzhin ◽  
Natalia Panzhina
Keyword(s):  
Rock Mass ◽  
Strain State ◽  
Industrial Site ◽  
Deformation Characteristics ◽  
Geomechanical Model ◽  
Stress Strain ◽  
Time Periods ◽  
Mine Surveying ◽  
Negative Factors ◽  
Adjacent Rock

In the course of the work to identify the modern coordinates of the points of the state (SGN) and reference mine surveying (RMSN) networks of Orenburg Minerals JSC, the deformation characteristics of the earth’s surface in different time periods were obtained and a geomechanical model of the rock mass was built both on the industrial site itself (quarry, dump), and beyond the areas, influenced by mining. Based on the data obtained, the parameters of deformation of the rock mass and the adjacent rock mass in three planes, as well as the relative deformations and the magnitudes of the tectonic stresses that caused them were identified; during the analysis of negative factors potentially dangerous areas of the adjacent rock mass were also identified.

scholarly journals NUMERICAL SIMULATION OF THE STABILITY OF THE SIDES OF COAL MINES UNDER THE INFLUENCE OF DISTRIBUTED LOADS

2020 ◽  
Vol 12 (3) ◽  
pp. 428-435
Author(s):  
Dashzhan NARODKHAN ◽  
◽  
Tuiak ISABEK ◽  
Rustam KHODJAEV ◽  
Nurbol KHUANGAN ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Critical Distance ◽  
Mining Operations ◽  
Bead Surface ◽  
Negative Effect ◽  
Strip Mine ◽  
The Republic ◽  
The Stability ◽  
Adjacent Rock

The open method of solid minerals winning occupies a significant place in the total opening of the mining complex deposits of the Republic of Kazakhstan. In the energy band, a prominent role belongs to the Ekibastuz coal basin, where a number of large coal strip mine operates. The level of subsurface, equal parts of spoil bank of the external and internal stripping after a while lead to complex problems of ensuring the stability and safety of mining operations. The location of large external rock dumps on the bead surface has a negative effect on the stability of the latter. The purpose of the work was to establish the degree of the external rock dump influence located on the bead surface on the stability of adjacent rock mass of the coalmine depending on the distance of the dump to the upper edge of the side. There was numerical simulation of stress-strain state of adjacent rock mass under action of distributed load from rock dump carried out. It has been shown that studies of any point stability of the array from this type of load should be carried out on the basis of elasticity and the use of the finite element method theory implemented in packages of programs oriented specifically to scientific and engineering applications. There are the methodology and results of numerical modeling of quantitative assessments of various sections stability of the side loaded with an external rock dump with a height of 160m presented on the example of «Ekibastuz» coal mine. Based on a certain theory of rock strength and the criteria for their discontinuity, limit estimates of the critical distance of the external rock dump from the upper edge of the side were obtained, at which the latter may lose stability.

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