Antoshchenko М.I., Filatieva E.N., Filatiev M.V. On the issue of determining the boundaries of the impact of mine workings on the earth's surface

Details

Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 143

Geoteh. meh., 2018, 143, 153-163

https://doi.org/10.15407/geotm2018.143.153

ON THE ISSUE OF DETERMINING THE BOUNDARIES OF THE IMPACT OF MINE WORKINGS ON THE EARTH'S SURFACE

¹Antoshchenko М.I., ¹Filatieva E.N., ¹Filatiev M.V.

¹Volodymyr Dahl East Ukrainian National University

UDC 622.834:622.261.222

Language: Russian

Annotation.

The article presents the results of studies on establishing factors that determine boundary of dynamic semi-mold on the earth's surface in front of the projection of the advancing face.  Results of this work contribute to the successful solving of engineering problems on the rock pressure manifestation on the roadway supports, determining possible water and gas inflows from the undermined coal-bearing stratum and environmental consequences for the earth's surface. Theoretical part of the research methodology is developed according to the scheme of subsidence of the earth's surface points relative to the projection of the face. The curve of the trajectory of the earth's surface subsidence is divided by characteristic points at different stages of subsidence of the earth's surface.  Such stages include: beginning of the earth's surface displacement, active stage of displacement, end of the active stage and attenuation of the processes of the earth's surface subsidence. According to the formulated objective and the design scheme, and on the basis of experimental data, the authors determined parameters corresponding to the location of a point on the earth's surface where it began to subside. These parameters include the boundary angles and distance from the projection of the face to the point under consideration.  In relation to the scheme under consideration, three well-known dependencies were analyzed for describing the curve of the earth's surface subsidence: exponential equation, hyperbolic tangent function, and logistic curve.  By the derivatives of these dependencies, characteristic subsidence areas of the earth's surface were determined. The equations of the derivatives of the considered functions characterize dynamics of the earth's surface subsidence - the subsidence rate, acceleration and its change. Based on the extrema of the derivatives, the equations of coordinates of characteristic points of the curve of the dynamics of earth's surface subsidence are determined, including coordinates of the point of origin of of the earth's surface subsidence. For each object of observation, the empirical coefficients included in the initial equations are determined by the least squares method.  By using their numerical values and dependencies for determining coordinates of characteristic points, the authors found boundaries of the stage of the earth's surface subsidence during winning operations at ten sites.  The results obtained were almost the same according to the considered dependences. The final subsidence of the earth's surface determined with the help of the functions under consideration, in most cases, differed from each other by a value of not more than one percent. Only in one case, the maximum difference was 3.1%.  This made it possible to use any of the considered functions for determining the ordinates of characteristic points.  In a similar way, the possibility of using the analyzed functions for determining abscissas of the characteristic points of the earth's surface subsidence was established.  On their basis, it is established that the main influencing factor determining the boundary of the dynamic semi-mold is the depth of mining operations, and the boundary angles are practically independent on this parameter.

Keyword:

earth surface, point, beginning of subsidence, dynamic semi-trough, boundary, face, movement, depth, boundary angles.

References

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About the authors

Antoshchenko Nikolay Ivanovich, Doctor of Technical Sciences (D. Sc.), Professor, Department of Chemistry and Labor Protection, Volodymyr Dahl East Ukrainian National University, Severodonetsk, Ukraine.

Filatieva Elvira Nikolaevna, Doctoral Student, Volodymyr Dahl East Ukrainian National University, Severodonetsk, Ukraine. This email address is being protected from spambots. You need JavaScript enabled to view it. .

Filatiev Mikhail Vladimirovich, Candidate of Technical Sciences (Ph. D.), Associate Professor, Department of Construction, Urban Studies and Spatial Planning, Volodymyr Dahl East Ukrainian National University, Severodonetsk, Ukraine. This email address is being protected from spambots. You need JavaScript enabled to view it. .

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