Sadovenko I.O., Tymoshchuk V.I., Zahrytsenko A.N., Dereviahina N.I. Estimation of parameters of hydrogeomechanical influence of extraction works on emergency degasation well

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 144

Geoteh. meh. 2019, 144, 199-208

https://doi.org/10.15407/geotm2019.144.199

Estimation of parameters of hydrogeomechanical influence of extraction works on emergency degasation well

1Sadovenko I.O., 1Tymoshchuk V.I., 1Zahrytsenko A.N., 1Dereviahina N.I.

1National Technical University “Dnipro Polytechnic”

UDC 622.831:838.5

Language: Russian

Abstract.

Parameters of safe hydrogeomechanical influence of extraction works on an emergency degasation well are justified in this paper considering the mechanism of movement of water-sand mixture to a degasation cross-cut. Results of analytical solutions, physical modeling and an experimental-industrial experiment are used. Transcendental analytical relation between the width of an opening crack, the function of water pressure and sand filtration coefficient is determined, which maintains the stability of a “crack-sand” contact. This data was confirmed by a large-scale experiment in the mine field, and a transition of water-sand mixture movement to a critical phase in a mine working was studied on a physical model with multiple fixation of a phase of self-braking of an outflow cone.

A numerical geomechanical model, implemented on a basis of a finite element method in elastic-plastic formulation was used to estimate a hydrogeomechanical state of the rock massif in a zone of a projected protective pillar around the degasation well. It was established that the permeability of water-saturated Buchak sand is braking during the openness of cracks with a relative deformation of a massif of up to 0.01 (equivalent to 10 multiplicities of underworking), and shear horizontal deformations are an order of magnitude less than those recorded by geophysical data immediately after the accident. Stope development from the side of a field of an adjacent mine more actively affects the dangerous “Buchak sand-Carbon” contact. Absence of exceeding levels of deformation of critical values of e = 0.003-0.005, both on the contour of an emergency well, and within the protective pillar in general, indicates the preservation of integrity of rock stratum of layers on the “Buchak-Carbon” contact as well as the grouting material in the annulus of an emergency well. Under the conditions of development of creep deformations, there is a certain “mitigation” of displacements along the contour of a degasation well. The results of carried out research evidence a possibility of development of stopes №126, 128, 130 of Yubileynaya mine and a stope №175 of Stepnaya mine within limits of normative pillar around degasation well.

Keywords:

water-sand mixture, grouting, geomechanical influence, modeling, safety parameters of mining works

References:

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About the authors:

SadovenkoIvan Oleksandrovych, Doctor of Technical Sciences, Professor, Professor at Department of Hydrogeology and Engineering Geology, National Technical University "Dnipro Polytechnic", Dnipro, Ukraine

Tymoshchuk Vasyl Ippolitovych, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University "Dnipro Polytechnic", Dnipro, Ukraine

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.

DereviahinaNataliiaIvanivna, 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.