scholarly journals ANALYSIS OF SUPPORT AND TAMPING METHODS OF THE BEHIND-ANCHORING SPACE OF MINE WORKINGS AND METHODS FOR CALCULATING THE INTERACTION OF THE SUPPORT WITH THE ROCK MASSIF

2021 ◽  
pp. 27-52
Author(s):  
Alexander S. Liskovets ◽  
Victor P. Tatsienko
Keyword(s):  
Rock Massif ◽  
Mine Workings

scholarly journals Development of Technological Schemes for Conducting Mine Workings with the Use of an Anchorage with Allowance for the Stressed State of the Rock Massif

2018 ◽  
Vol 155 ◽  
pp. 01031
Author(s):  
Alexander Tomilov ◽  
Nadezhda Tomilova ◽  
Assiya Batyrkhanova
Keyword(s):  
Stressed State ◽  
Rock Massif ◽  
Structural Scheme ◽  
Effective Technology ◽  
Highly Effective ◽  
Mine Workings

The article presents a structural scheme for solving the problem of creating a highly effective technology for conducting and supporting preparatory workings, consisting in establishing the laws governing the development of geo mechanical processes for the development of rational technological schemes for conducting mine workings with anchorage. The order of development of technological schemes of carrying out of mine workings with application of an anchor fastening taking into account the intense condition of a file of rocks is generated.

scholarly journals Development of design solution for mine workings support repair and recovery in case of local massif deformations

2021 ◽  
Vol 315 ◽  
pp. 01010
Author(s):  
Sergey Tsibaev ◽  
Alexey Renev ◽  
Stepan Kalinin
Keyword(s):  
Rock Massif ◽  
Design Solution ◽  
Field Observations ◽  
Coal Rock ◽  
Mine Workings ◽  
Design Solutions ◽  
Term Field

The article describes the causes of occurrence and forms of geomechanical processes manifestation in surrounding coal-rock massif of mine workings supported by anchor support. Based on long-term field observations, six forms of typical deformations of the surrounding massif have been established. Design solutions to strengthen the anchor support or complete reinforcement of damaged sections of mine workings during geomechanical processes of local felling have been developed. They include: installation scheme, substantiation of parameters and list of used reinforcement elements; technology of work, a list of equipment used.

scholarly journals A Proposal of Rock Burst Control Measures at the Coalface No. 1 4064 at the Mining Plant 1, in OKD, A. S. Czech Republic

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Václav ZUBÍČEK ◽  
Vlastimil HUDEČEK ◽  
Milan KUBICA
Keyword(s):  
Czech Republic ◽  
High Risk ◽  
Rock Burst ◽  
Stress Level ◽  
Rock Massif ◽  
Control Measures ◽  
Rock Bursts ◽  
Mine Workings ◽  
Mining Plant

The paper describes a proposal of rock burst control measures for excavation and mining of the area the Coalface No. 1 4064, which is located in the 1st mining block of the Mining Plant 1, locality Karviná. It is an area that has been left in place as a protective area for safety reasons due to the high risk of rock bursts, and it is bordered on both sides by old workings.The aim of the proposal is to extract the retained area by using rock burst control measures to reduce this risk. As a measure, extensive disintegration of the rock massif in the overlying rocks of the seam by blasting works was chosen, both in driving mine workings and in mining of the coalface.The article describes the methods and scope of implementation of active and passive rock burst control measures in standard situations and in the case of detection of an unfavourable stress level.

scholarly journals Analysis of rock mass and anchor support elements deformations during the long-term maintenance of mine workings

2020 ◽  
Vol 174 ◽  
pp. 01001
Author(s):  
Sergey Tsibaev ◽  
Alexey Renev ◽  
Rinat Zainulin ◽  
Alexander Kucherenko
Keyword(s):  
Water Saturation ◽  
Visual Assessment ◽  
Rock Massif ◽  
Underground Mines ◽  
Survey Period ◽  
Rock Stability ◽  
Mine Workings ◽  
Roof Rocks ◽  
Term Maintenance

The results of instrumental and visual assessment of near-rock massif and anchor support elements state in the conditions of long-term maintenance of mine workings has been presented. Particular attention is paid to underground mines in a flooded state. The result of various profiles fixing bolts strength tests of in the roof and sides of the workings has been presented. It has been established that the probability distribution of the anchoring bolts force in the holes in roof of the workings obeys the normal distribution tendency. The result of a radar survey of roof rocks using the Georadar OKO-2 has been analyzed. It was revealed that the height of the stratification of rocks in the mine workings roof varies from 0.2 m to 2.25 m, a comparison is made with the theoretical height of the collapse arch. The propensity of the near rock massif to water saturation has been estimated, the height of the water saturation of the roof rocks has been established. It has been established that the height of moisture depends on the arch of rock stability formed during the survey period. It has been found that water saturation of the rocks leads to a decrease in the specific cohesion of the resin capsules bonding composition with the walls of the hole by 55-67% in roof and by 72% in walls of mine workings.

scholarly journals The influence of the rigidity of mining security structures on the stability of side rocks in the coal-rock massif

2021 ◽  
Vol 3 (1(59)) ◽  
pp. 19-22
Author(s):  
Anton Korol
Keyword(s):  
Flexural Rigidity ◽  
Compressive Load ◽  
Rock Massif ◽  
Crushed Rock ◽  
Original Material ◽  
Dimensionless Stress ◽  
Coal Rock ◽  
Mine Workings ◽  
The Stability ◽  
Stratified Rock

The object of research is the processes of controlling the state of side rocks to prevent the collapse of the stratified rock strata in the coal-rock massif containing the workings. The studies carried out made it possible to establish the influence of the rigidity of the guard structures of mine workings on the stability of side rocks in the coal-rock massif. It is proved that as a result of the action of an external compressive load on the supporting lateral rocks, the structure, in the form of a model of bunches made of wooden posts, increases its rigidity until the destruction of the security structure. After that, there is an increase in the convergence of side rocks and their destruction. The change in the stiffness of the crushed rock in the filling massif model, which is used to support the lateral rocks, occurs as a result of the compaction of the original material. This is due to repackaging of crushed rock fractions of different sizes and its additional grinding. As a result of this interaction of the side rocks with the filling massif, the integrity of the roof and soil is ensured and convergence is limited. To assess the stability of side rocks, it is proposed to use a dimensionless stress concentration factor k. This coefficient takes into account the rigidity of the guard structures of the mine workings and the flexural rigidity of the side rocks. It was found that when the values of the coefficient k are close to zero (k→0), there is a loss of stability of the guard structures of mine workings and the destruction of side rocks in the coal-rock massif. The preservation of the integrity of the side rocks and the stability of security structures is ensured at values of k>0.1, which corresponds to the parameters of the pliable supporting structures. Most favorably on the condition of side rocks in the coal-rock massif is influenced by the method of backing up the mined-out space of crushed rock. The use of this method excludes the collapse of side rocks. When solving the problem of stability of mine workings at the stage of making technical decisions, it is necessary to predetermine the issues of rigidity of security structures with deformation characteristics of side rocks.

scholarly journals Substantiation of the method ensuring the safe development of the pit reserves of kimberlite ore deposits in the conditions of the Udachny mine

2021 ◽  
Vol 266 ◽  
pp. 03013
Author(s):  
K. A. Anisimov ◽  
V. P. Zubov
Keyword(s):  
Ore Deposits ◽  
Underground Mine ◽  
Rock Massif ◽  
Mining Operations ◽  
Pressure Drops ◽  
Low Coherence ◽  
Ore Bodies ◽  
Edge Part ◽  
Underground Mine Workings ◽  
Mine Workings

The paper discusses the features of the development of pit reserves of the Udachnaya diamondiferous pipe which consists of two closely spaced ore bodies under the protection of a moving ore-rock massif (a safety cushion). Low stability of the rock massif located between the ore bodies is indicated. Such low stability is caused by the presence of areas of increased intensity of fracturing and low coherence zones in the massif; it is also caused by the mutual impact of mining operations carried out in closely located ore bodies. A conclusion is made about the danger of collapse of sizeable rock blocks from the edge zones of the rock massif located between the ore bodies onto the safety cushion. In this case, individual rock blocks can be 0.4-0.6 tons or more, the drop height is up to 600-700 m. Impact blows on the safety cushion when rock blocks collapse onto it can cause a disruption of underground mine workings stability and occurrence of dangerous pressure drops at the outlet of air waves from the safety cushion into the underground mine workings. A method for preventing dangerous impact blows is proposed, which consists in the forced collapse (with certain parameters) of the edge part of the rock massif located between the ore bodies, onto the safety cushion.

scholarly journals Scientific and technical aspects of grouting of marginal rocks of mine workings

2020 ◽  
Vol 168 ◽  
pp. 00057
Author(s):  
Serhii Musiienko ◽  
Tetiana Palamarchuk ◽  
Liliia Prokhorets ◽  
Volodymyr Kurinnyi
Keyword(s):  
Concrete Structures ◽  
Operating Conditions ◽  
Rock Massif ◽  
Plunger Pump ◽  
Technical Aspects ◽  
Structure System ◽  
Maximum Radius ◽  
Roadway Safety ◽  
Mine Workings

The goal of the paper is to justify ways to achieve maximum radius of extent of grouting mortar in a rock massif and to maximize filling of cavities and cracks with minimal openings. Filling of cavities and cracks directly influences a “massif – roadway – safety structure” system. Some scientific and technical aspects of grouting and injecting inorganic binders into marginal rocks are considered. Advantages of usage of triple plunger pumps in injecting units are determined. The influence of pulsation on a condition and process of grouting mortar extension is justified. It is established that under equal operating conditions, pulsations created by a triple plunger pump reduce mortar viscosity by 15 %, and a radius of extent of mortar based on grouting cements is increased by an average of 12 %, and with usage of very finely dispersed substances – up to 20 %. Suggested recommendations significantly improve the technology of grouting of marginal rocks and concrete structures.

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