STABILITY ESTIMATION OF HYDRAULIC FILLS IN UNDERMINED AREAS

The article reviews the general principles of hydraulic fill undermining in coal fields and describes the engineering geological conditions of hydraulic filling. The main factors affecting stability of undermined slopes of hydraulic fills are the change of the geometric parameters of the structure, reduction in strength characteristics of soil foundation rocks, alteration of hydrogeological regime, as well as the formation of excessive pore pressure in the body and bed of hydraulic fill. The slope stability estimation procedure is developed for undermined hydraulic fills with regard to the listed factors. As a part of the study, the slope stability calculations are carried out for hydraulic fill at the Elovka River in case of different direction advance of underground stoping face: toward the slope, from under the slope and along the slope. From the calculation results, the variation in the safety factor of the hydraulic fill during its undermining is determined as function of all listed influences and each factor individually. The analysis of the obtained results is carried out and the most unfavorable conditions of hydraulic fill undermining are determined. It is found that the worst conditions of slope undermining in any case of the stoping front advance take place when the retaining prism is undermined. Vice versa, undermining of the active earth pressure block yields positive results. The developed procedure enables quantitative assessment of impact exerted by underground mining on hydraulic fill slope stability and validation of recommendations on safe operation and undermining of hydraulic fills. 

For citation: Protosenya A. G., Kutepov Yu. Yu. Stability estimation of hydraulic fills in undermined areas. Gornyy informatsionno-analiticheskiy byulleten'. 2019;3:97-112. [In Russ]. DOI: 10.25018/0236-1493-2019-03-0-97-112.

Keywords

Hydraulic fill, dams, displacement, undermining, stability, coal field development, hydrogeomechanical processes.

Issue number: 3
Year: 2019
ISBN: 0236-1493
UDK: 622.275
DOI: 10.25018/0236-1493-2019-03-0-97-112
Authors: Protosenya A. G., Kutepov Yu. Yu.

About authors: A.G. Protosenya, Doctor of Technical Sciences, Professor, Head of Chair, e-mail: kaf-sgp@mail.ru, Yu.Yu. Kutepov, Graduate Student, e-mail: KutepovYY@ya.ru, Saint Petersburg Mining University, 199106, Saint-Petersburg, Russia. Corresponding author: Yu.Yu. Kutepov, e-mail: KutepovYY@ya.ru.

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