FORMATION OF SUSTAINABILITY OF SOIL MASSIVE INCLUDING TUNNELS OF A MULTI-PLEASURE

On the basis of the analysis of the results of computer and laboratory research in scientific work, it is necessary to develop an improvement of the method of fixing of the soil mass during the construction of the underground tunnel subway, as well as to develop a spatial mathematical model of the formation of the contour of a fixed zone with the processing of the tunnel, taking into account the emerging characteristic deformation zones. The methodological basis of the research complex consists of the analysis and generalization of the known results of practical experience in fixing the soil mass during the construction of the underground tunnel tunnel, the method of simulation of the stress-strain state of the joint work "design – soil massif" performed in the program "Midas GTS". The spatial mathematical model of the process of forming the contour of the fixed zone by a chemical method is developed. With the use of chemical fixation the precipitate decreased by almost 2 times. It has been theoretically established that during chemical fixation, the soil-tunnel system has improved the bearing capacity. The authors of the work have theoretically substantiated the mechanism of formation of strength properties of the adjacent soil mass during the implementation of chemical fixation taking into account the physical and mechanical properties of the treated media, and solving the actual scientific and practical problem of forming the bearing capacity of the tunnel bases in sandy soils due to the application of the progressive method of additional sealing, which allows using the potential bearing capacity of the soil massif, which significantly increases the technical and operational parameters three built by this method of underground structures. At the stage of designing the subway lines of shallow laying, it is necessary to take into account the processes of strengthening the soil-rich soil array that contains the overhung tunnel. This will allow the formation of the soil solidity around the tunnels of shallow laying.