Sadovenko I.А., Tymoshchuk V.I., Zahrytsenko A.N., Dereviahina N.I. Evaluation of hydrogeomechanical risks for mining operations in the area of influence of floor operations
- Details
- Parent Category: Geo-Technical Mechanics, 2020
- Category: Geo-Technical Mechanics, 2020, № 151
Geoteh. meh. 2020, 151, 190-202
DOI: https://doi.org/10.15407/geotm2020.151.190
Evaluation of hydrogeomechanical risks for mining operations in the area of influence of floor operations
1Sadovenko I.А., 1Tymoshchuk V.I., 1Zahrytsenko A.N., 1Dereviahina N.I.
1National Technical University “Dnipro Polytechnic”
UDC 622.831:838.5
Language: Ukrainian
Abstract.
Justification of rational parameters of a barrier safety pillar using an example of real mining and technical situation near the flooded 1st southern stope of the seam l21 of the southern slope of the Dobropilska mine of Industrial-Structural Enterprise “Colliery Group Dobropilske” for safe development of ventilation drift of the adjacent 2nd southern stope of the seam l21. Numerical modelling of processes of non-stationary filtration in finite differences for determining predicted water inflows into the working, which is in the influence zone of developed and flooded areas. Estimation of a stress-strain state of rocks of the barrier (or safety) pillar in the influence zone of flooded workings is performed using the profile model of a mine fieldarea, where the solution results of problems of planned filtration on forming a field of pressures around mine workings are used.
It is established that the developed and flooded field of stopeshas a lasting draining influence oncoal–waste rock massif, while creating lowered values of pressures within the developed areas. In addition, permeability parameters of collapsed rocks approach the natural values in a process of their gravitational densification for 25 years. For sizes ofa safety pillar with width of 20 and 5 meters water inflows from the side of the flooded field have a secondary value and are 8…17 % of the total drainage of a new stope under design. During this, the risks of water influx from stratified zones of a roof of contiguous coal seamare present, where zones of the most intense crack looseningare formed in the interval of rock interlayer at joints of preparatory workings.
Parameters of safety pillar stability and risk of filtration water influx considering the changes of filtration, capacity, and geomechanical properties of a rock massif in time are qualitatively estimated for the first time. The estimation is based on a synthesis of models of non-stationary filtration in finite differences and profile finite-element hydrogeomechanical model of discrete medium.
Recommendations on determining the optimal size of a safety pillar in an influence zone of flooded workings are developed and introduced in production. The safety pillar ensures the safety of mining operations on the one hand and the completeness of coal extraction on the other one. Risks of water influx from stratified zones of a roof of contiguous coal seam can be minimized through preparation and development of diagonal stopes with a standard slope for water drainage.
Keywords:
hydrogeomechanical processes, flooding, barrier safety pillar, modelling, water inflow, deformations
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About the authors:
Sadovenko Ivan Oleksandrovych, Doctor of Technical Sciences, Professor, Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Tymoshchuk Vasyl Ipolitovych, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Zahrytsenko Alina Mykolaivna, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Dereviahina Nataliia Ivanіvna, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.