TECHNOLOGY OF ALIGNMENT OF THE BUILDING OF ZAGORSK PUMPED STORAGE STATION BY COMPENSATION GROUTING METHOD

Subject: elimination of excessive non-uniform deformations of the building of Zagorsk pumped storage station unit (pumped-storage hydroelectric power station) under construction by using the method of compensation grouting. Research objectives: development of a methodology for assigning optimal values of the main technological parameters, such as pressure, intensity of injected mixture, consumption of the mixture per unit volume of soil, based on experimental data of tests of various types of soil on the model; justification of the method for calculation of pressure for fracturing the casing layer of the tube-a-manchette before injection. Materials and methods: the following materials were used: high permeability grouts “KN-1” with adjustable structural strength for primary impregnation of the soil massif; injection material “KN-2” with increased viscosity and a slow strength gain to create a stressed state in the soil and ensure leveling of the building; casing grout “Solidur” for fixing the tube-a-manchette in the borehole. Kinetics of impregnation and the nature of distribution of the material “KN-1” were studied on a unidirectional model. Results: on the laboratory unidirectional model, the main technological parameters were worked out for alignment of the building of Zagorsk pumped storage station unit using the technology of compensation grouting at the experimental site located in immediate vicinity of the main facility. Nomograms for assignment of optimal technological parameters of the compensation grouting process were developed. Conclusions: tested mineral-based injection systems fully comply with the technological requirements for production of works on compensation grouting. The results of experimental and theoretical studies allow us to reasonably assign optimal values of the main parameters of technological regulations for all stages of production of works on compensation grouting.