Mining and geological conditions of methane redistribution within the undermined coal-rock massif

2014 ◽  
pp. 329-338 ◽  
Keyword(s):  
Rock Massif ◽  
Geological Conditions ◽  
Coal Rock

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 Geomechanical justification of security measures in the development of the South Khingan deposit of manganese ore

2018 ◽  
Vol 56 ◽  
pp. 02014
Author(s):  
Maksim Rasskazov ◽  
Marina Potapchuk ◽  
Gennady Kursakin ◽  
Denis Tsoy
Keyword(s):  
Physical And Mechanical Properties ◽  
Rock Massif ◽  
Manganese Ore ◽  
Security Measures ◽  
The South ◽  
Rockburst Hazard ◽  
Field Development ◽  
Stage Of Development ◽  
Geological Conditions ◽  
Numerical Simulation Methods

The paper presents the results of geomechanical studies on the assessment of the potential rockburst hazard of the rock massif of the South Khingan deposit of manganese ore at the stage of development. Geodynamic zoning has been performed, mining and technical, mining and geological conditions of field development have been studied, and parameters of physical and mechanical properties of enclosing rocks and ores have been determined. Numerical simulation methods have been used to estimate the stress state of a rock massif at various stages of the deposit development. The tendency of the lower part of the South Khingan deposit to rockburst has been established. The complex of effective organizational and technical security measures has been substantiated in the development of this field.

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

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.

Coalbed Methane (CBM) Project Enrichment Area and Economic Evaluation

2013 ◽  
Vol 772 ◽  
pp. 776-780
Author(s):  
Jin Shan Li ◽  
Zhong Xue Li ◽  
Bing Hui Zu
Keyword(s):  
Economic Evaluation ◽  
Coalbed Methane ◽  
Relative Concentration ◽  
Rock Properties ◽  
Coal Bed ◽  
Benefit Evaluation ◽  
Geological Conditions ◽  
Unconventional Natural Gas ◽  
Coal Rock ◽  
Gas Bearing

Coalbed gas, also called coalbed methane gas, is a kind of unconventional natural gas located in coal and rocks, coexisting with coal and its main ingredient are methane. On different levels of structure, coal bed methanes adsorption has partition zonality. The gas-bearing of coal seams has relative concentration in different tectonic units, is known as coalbed methane (CBM) enrichment. Influenced by coal rank, coal, rock properties and various geological conditions and other factors, the enrichment has certain regularity. In the study of the coal bed gas enrichment, coal bed gas enrichment especially refers to coal bed methane enrichment. Economic evaluation is that it may analysis reserves financial feasibility and economical rationality for coal seam to get the best economic benefit evaluation, by various stages in CBM cost and final production and income situation.

Rapid Excavation Research of Half Coal Rock Lane in Liu-Wan Mine

2012 ◽  
Vol 170-173 ◽  
pp. 418-423 ◽  
Author(s):  
Ren Shu Yang ◽  
Wen Jun Cao ◽  
Guo Qing Liu ◽  
Xiao Sheng Bai ◽  
Dong Ming Guo
Keyword(s):  
Theoretical Calculations ◽  
Utilization Rate ◽  
Construction Process ◽  
Unit Consumption ◽  
Driving Speed ◽  
Geological Conditions ◽  
Temporary Support ◽  
Coal Rock ◽  
Rapid Excavation ◽  
Low Rate

In order to solve the question of excess or under excavation, poorly forming around the lane, low rate of excavation caused by less drilling, arbitrarily drilling, non-standard charging, unreasonable initiation network in the construction process of half coal rock lane in Liu-wan mine. According to coal and rock conditions at the scene and through theoretical calculations and engineering analogy, made a scientific and rational borehole layout and correct initiation network, strengthened temporary support and changed operation modes. The driving rate of the single circulation was improved from 1.6m to max.2.75m. The utilization rate of the blasting boreholes was improved from 89% to previous 94.7%. The unit consumption of explosives was significantly reduced from the original 1.24kg/m3 minimum to 0.74 kg/m3.Thus the profile shape results would be good and the driving speed could be highly increased. Research results will be the same geological conditions for excavating to provide reference.

scholarly journals Simulation of the desorption process of methane adsorbed in a coal rock, taking into account intermolecular sorption interactions in the system “methane-coal”

2019 ◽  
Vol 109 ◽  
pp. 00073
Author(s):  
Alla Prusova ◽  
Oleksandr Minieiev ◽  
Svitlana Ryzhova
Keyword(s):  
Analytical Calculation ◽  
Activation Process ◽  
Mining Operations ◽  
Desorption Process ◽  
Jones Potential ◽  
Lennard Jones ◽  
Geological Conditions ◽  
Coal Rock ◽  
Nonequilibrium Sorption ◽  
Kinetics Of

Based on the analysis of the stages of the desorption of methane adsorbed in the coal rock, the simulation of this process was based on its consideration as an activation process of diffusion. It was found that the intermolecular sorption interactions in the “methane-coal” system should be described by the Lennard-Jones potential, taking into account the polymeric nature of the molecular structure of coal. Therefore, an analysis of the modern theories of the kinetics of nonequilibrium sorption processes in high-molecular materials was performed. This analysis showed that the complex of the main molecular factors in the system “methane – coal” can be taken into account most correctly using the Pace – Deutiner molecular parameters. The diffusion coefficient in the equation takes into account the activation energy of the diffusion process, intermolecular sorption interactions in the “methane-coal” system, the parameters of the microstructure of coal, the physical properties of methane and the magnitude of its diffusion jump. The analytical calculation of the diffusion equation is carried out. It allows determining the patterns of the desorption process in various geological conditions of mining operations.

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.

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