Purpose. Determining the increase of rock displacements nearby a pre-constructed dismantling chamber while a plow longwall approaching. Additional goal is to develop a technique for estimating the pressure created by failed rocks at different stages of mining. Methodology. Displacements around a pre-constructed dismantling chamber were studied in situ using tell-tale stations. Numerical simulation was carried out to determine the rock stress-strain state applying a plastic deformation model. The numerical procedure of strain accumulation was implemented at the sequential change of mined-out space while modeling. Areas of broken rocks (failure zones)were determined according to Hoek - Brown strength criterion. Numerical simulation was carried out concerning different geological conditions and excavation dimensions. The non-linear estimation method combining with multiple regression and variance analysis were used to build general regularities. Findings. The multi-variant calculations of stress-strain state change were carried out for different values of rock strength, coal seam thickness, mining depth and dismantling chamber size as well. The results were generalized for different geological conditions. The failure zone height and excavation contour displacements are represented as a function of factors mentioned above. Originality. New regularities were obtained relatively the increase of rock displacements nearby a dismantling chamber. A failure zone spreading was shown depending on rock properties. Convenient techniques were developed to calculate constitutive geomechanical characteristics and provide an adequate support design for dismantling chamber under various mining and geological conditions. Practical value. The set of formulas derived with regression method allows determining the main geomechanical characteristics and gives a simple technique to design the support of dismantling chamber. This is a background for developing the general standards related to dismantling chamber designing under Western Donbass geological conditions.

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