ВДОСКОНАЛЕННЯ СПОСОБІВ ЗБЕРЕЖЕННЯ СТІЙКОСТІ ПІДГОТОВЧИХ ВИРОБОК З УРАХУВАННЯМ ДЕФОРМАЦІЙНИХ ВЛАСТИВОСТЕЙ ОХОРОННИХ СПОРУД

Abstract

Purpose. To evaluate the deformation properties of protective constructions of preparatory workings to maintain their stability in the excavation areas of coal mines with steep coal seams. Methodology. To achieve this goal, laboratory and field studies of the deformation properties of protective constructions have been performed. Results. It has been established that under uniaxial compression, under the action of a statistical external force, which manifests itself in the conditions of uniaxial compression and relative deformation of wood chocks within 0.1<λ<0.2, their stiffness decreases, and then it increases at 0.4<λ<0.7, which creates conditions for ensuring the bearing capacity of protective constructions. Under field conditions, when using the method of protecting the slope drifts with wood chocks made of sleepers, after their deformation of more than 40% in the zone of influence of mining works (0<l<100 m), a gradual decrease in the increase in the displacement of side rocks on the contour occurs during the compaction process, due to which the operational condition of the preparatory workings along the length of the excavation section is ensured. To study the deformation characteristics of the protective constructions, we used the function of the incremental displacement of the side rocks on the contour of the workings at the section of 0<l<100 m behind the face. Scientific novelty. The regularities of deformation of protective constructions of preparatory mine workings under uniaxial compression with regard to changes in their stiffness have been established. Practical significance. When mining steep coal seams, using the peculiarities of geomechanical phenomena manifested in the coal massif, it is advisable to use compressible protective constructions of preparatory mine workings.