Increasing stability of underground mine workings by forming new geotechnical properties of adjoining layers via roller compaction

Purpose. To create a model reproducing the process of forming geotechnical properties of the rock massif adjoining circuit of underground excavation by roller compaction method incorporating hardening and creating the zone of slow plastic deformation. Methods. Modelling the main technological parameters of manufacturing process as for adjoining circuit of the tunnel: distribution of normal pressures and heights of the core seal depending on the main strength and deformation properties of rock massif, geometry and characteristics of the contact area of roller working body with the working medium. Findings. The choice of the computational model simulating the formation of adjoining mountain contour properties by roller method has been justified taking into account the processes caused by soil deformation: appearance of elastic and plastic deformation, change of soil characteristics, formation of compaction core. The main stages and parameters interrelations in modelling the processing of the tunnel adjoining zone are shown. Originality. Scientific novelty is referred to the development of a method to analyze contact interaction of the roller working body of a molding machine with the massif, considering changes in the process of the treated medium physical and mechanical properties stabilization, with the aim to predict the required stress and depth of the formed layer. Practical implications. The research allowed to infer theoretical fundamentals for the formation of geotechnical properties inherent to the adjoining contour of underground excavation by roller method, taking into account peculiarities of soil deformation and contact interaction of the working body with the environment which allows to improve the tunnel construction technology by strengthening the carrying capacity of the marginal massif. The obtained results are instrumental in determining parameters of the elastic and plastic deformations zone with the view to establishing its height and stresses.