scholarly journals Influence of surfactants on dispersed of silica dust under explosive destruction of coal-rock massif

2014 ◽  
Vol 8 (4) ◽  
pp. 431-435
Author(s):  
V Golinko ◽  
◽  
D Saveliev ◽  
Ya Liebiediev ◽  
K Ishchenko ◽  
...  
Keyword(s):  
Rock Massif ◽  
Silica Dust ◽  
Coal Rock ◽  
Explosive Destruction

THE ESTABLISHMENT OF DYNAMIC PARAMETERS OF THE ZONE OF LIMIT STATE OF COAL-ROCK MASSIF

2019 ◽  
pp. 34-40
Author(s):  
А. Molodetskyy ◽  
◽  
О. Gladkaya ◽  
V. Slyusarev ◽  
◽  
...  
Keyword(s):  
Limit State ◽  
Rock Massif ◽  
Dynamic Parameters ◽  
Coal Rock

scholarly journals MODELING OF STABILITY OF SIDE ROCKS IN A COAL MASIFWITH DIFFERENT METHODS OF SUPPORT THE WORKINGS

2021 ◽  
Vol 37 (3) ◽  
pp. 28-34
Author(s):  
V. Yu. Dovhal
Keyword(s):  
Static Field ◽  
Rock Massif ◽  
Shear Stresses ◽  
Support Structures ◽  
Coal Seams ◽  
Rock Stratum ◽  
Static Loads ◽  
Flexible Support ◽  
Coal Rock ◽  
The Stability

Purpose of work. Determine the conditions of the side rocks stability in a coal massif with different ways of support coal-rock stratum to ensure safe working conditions for miners in the excavation areas of a coal mine with steep coal seams. To achieve this goal, laboratory studies were carried out on models of optical and equivalent materials. The modeling of the stability of side rocks in a coal-rock massif was carried out with the methods of support roadways with vertical timber setsand wooden crib supports: 4-point chock.On models made of optical materials in the analysis of the static field of the distribution of shear stresses in side rocks, the regularity of the change in hazardous manifestations of rock pressure, depending on the deformability of support structures, was recorded. On equivalent models of support structures, the deformation characteristics of experimental samples were determined and their effect on the integrity of the roof under the action of static loads was established. When using rigid support structures in the form of vertical timber sets made of wooden racks to protect sliding drifts, there is a deterioration in the stability of side rocks and destruction of the roof. When using flexible support structures in the form of wooden crib supports: 4-point chock, a smooth deflection of the roof and its integrity are observed. A decrease in the size of the stress concentration zone in the model of a coal-rock massif with workings after the compaction of flexible support structures located above the haul roadway, due to a change in their rigidity, when as a result of the convergence of side rocks, a smooth deflection is provided and the movement of the roof is limited. To ensure the stability of side rocks and development workings, as well as reduce the level of injuries of miners from landslides and collapses in the excavation areas of coal mines that develop steep seams, it is advisable to use flexible support structures, when using which, a smooth deflection of side rocks and their integrity in the mined-out area is ensured coal massif.

scholarly journals Complex spectral-acoustic monitoring of the state of fluid-saturated coal-rock mass

2020 ◽  
Vol 168 ◽  
pp. 00059
Author(s):  
Yurii Pylypenko ◽  
Iryna Konstantynova ◽  
Kchichtof Оzet
Keyword(s):  
Acoustic Emission ◽  
Roof Rock ◽  
Experimental Studies ◽  
Rock Massif ◽  
Complex Stressed State ◽  
Rock Destruction ◽  
Saturated Rock ◽  
Control Research ◽  
Coal Rock

Subject of the research is the methods for monitoring properties and state of coal-rock massif. This work is an experimental validation of the studied parameters of acoustic emission occurred during destruction of the roadway roof. Elements of the theory of acoustic emission control, research methods, results and experimental studies of the fluid-saturated rock destruction were studied. In this article, methods of studying and interpreting the results of geophysical observations of the process of the roof rock stratification and fall at caving of the undermined rocks at a complex stressed state are presented. Biseds, approaches to solving the problems of managing and controlling the dynamics of changes in the stress-strain state of the undermined fluid-saturated coal-rock massif based on factors of autocorrelation between the seismic-acoustic phenomena occurred over time are described. Experimental grounds are given to the complex control methods with determination of the level of disintegration by the Fourier estimation of the amplitude-frequency and amplitude-time spectra.

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 Controlling coal rock massif hydro-treating process by instrumental and geophysical methods

2021 ◽  
Vol 315 ◽  
pp. 03029
Author(s):  
Vladimir Klishin ◽  
Alexander Shadrin ◽  
Alexander Teleguz
Keyword(s):  
Crack Formation ◽  
Preventive Measures ◽  
Fluid Pressure ◽  
Geophysical Methods ◽  
Rock Massif ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation ◽  
Acoustic Methods ◽  
Coal Rock ◽  
Dynamic Phenomena

Coal rock massif hydro-treating methods accompanied by crack initiation and propagation under influence of injected fluid pressure and applied for preventing gas-dynamic phenomena are studied in the article. The perspectives of applying acoustic methods for controlling the process of crack formation and effective preventive measures are also studied.

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.

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