Method for controlling the floor heave in mine roadways of underground coal mines

Abstract

The method development and research on controlling the floor heave of mine roadways located in the zone of increased stresses by local strengthening the rocks with mixtures expanding in the solid phase.Methods. The work uses the following research methods: analysis and generalization of previously performed research on the process of heaving the floor in mine roadways; full-scale mining studies, which include instrumental measurements at benchmark stations, rapid measurements, photo-fixation of floor rock cuts in the areas of dinting.Findings. It has been determined that the problem of heaving the floor is relevant for most of the temporary roadways located in the zones of increased stresses, for example, in the zone of longwall face impact, both Ukrainian and foreign coal mines. The conducted full-scale mining studies have revealed that the floor rocks in the zone of increased stresses are in a destroyed state and can be represented as a block-discrete medium. A method for controlling the floor heave in mine roadways has been developed, which is based on the formation of locally strengthened zones of a special shape in the mine roadway floor. The strengthening effect is achieved by consolidating the rocks due to their compression by mixtures expanding in the boreholes drilled into the floor of the mine roadway. The method parameters have been calculated which make it possible to set the necessary expansion pressures for the formation in the mine roadway floor of a stable strengthened zone of a specified shape. Studies on the formation of local strengthening of floor rocks with mixtures expanding in mine conditions substantiate the fundamental possibility of rock consolidation.Originality. The ideas about the consolidation of a block-discrete medium by compression and the formation of stable strengthened zones with mixtures expanding in the solid phase have been developed.Practical implications. A method for controlling the heaving of floor rocks and a methodology for determining the method parameters have been developed. The results obtained can be used to ensure the stability of mine roadways in zones of increased stresses.

Substantiating the expedient route parameters for the location of the site outgassing wells in the Western Donbas conditions

“…It should also be noted the increased values of аs for a predominantly thin-and medium-bedded texture, which can be explained by the actual mechanism of the coal-overlaying formation deformation. A thicker sandstone layer has a multifold increased resistance to rock pressure and its significant bending occurs closer to the stoping face, where the resistance of the underlying lithotypes is reduced due to their own deformations [39][40][41].…”

Geomechanical substantiation of parameters for safe completion of mining the coal reserves adjacent to main workings

“…В. І. Бондаренко 1 , Г. А. Симанович 1 , І. А. Ковалевська *1 , М. В. Шишов 2 , В. Г. Яковенко 3 1 -Національний технічний університет «Дніпровська політехніка», м. Дніпро, Україна 2 -ТОВ «ДТЕК Енерго», м. Київ, Україна 3 -ПРАТ «Шахтоуправління «Покровське», м. Покровськ, Україна * Автор-кореспондент e-mail: kovalevska_i@yahoo.com Мета. Геомеханічне обґрунтування параметрів ведення очисних робіт із забезпеченням експлуатаційного стану розташованих поряд магістральних виробок.…”

“…A number of other peculiarities, due to the specific Western Donbas conditions, have also been identified and explained. In general, the work [1] provides new knowledge that is used when conducting this research: from general ideas about the peculiarities of displacements in the coal-overlaying formation of weakly metamorphosed rocks [2] to the disclosure of the mechanism for the formation and development of technogenic fractures in rock layers with the formation of a hinged-block displacement zone; tendencies of changes in the parameters of the bearing pressure zones depending on the texture and mechanical properties of the mass, the repulse reaction of the stope face powered support [3], the influence of factors weakening the rock, such as moisture saturation, fracturing and rheology (Baryshnikov A.S.). The experimental results of monitoring the loading of powered support sections, depending on the technological parameters of stope operations, are also of great interest.…”

Evaluation of Real-Time Perception of Deformation State of Host Rocks in Coal Mine Roadways in Dusty Environment

“…Therefore, the reflective target is the monitoring point to provide the measurement basis for binocular vision. In addition, considering that the actual roadway floor needs to work usually, it is challenging to arrange targets for monitoring, so the main research object of the experiment is the host rock part of the roadway [24]. Figure 2 shows five targets on the roadway roof, shoulder angles on both sides, and both sides as measuring points.…”