The article discusses the possibility of using reinforced cementation of rocks in order to consolidate the rock mass around underground workings and prevent water filtration into the turbine room and underground transformer room and tunnels of the Rogun HPP based on the experience of using this method in the construction of underground structures of the Kariba (Rhodesia) and Roselan-Bati HPPs (France). In recent years, comprehensive studies of rock masses containing the main underground structures of the Rogun HPP made it possible to clarify the current state of these masses and update the characteristics of their elastic and deformation strength properties obtained at the technical design stage. The results of the performed calculations testify to the normal operation of the anti-seepage circuit of the dam and indicate high efficiency of the drainage system of the pressure head unit.
The article describes the production experience and a static analysis of the results of field measurements during the excavation of mine workings by contour blasting. A decision to perform field measurements during excavation and a statistical analysis of the results is made in order to assess the possibility of their use for normalization. The high degree of correspondence of the actual distribution of the results of field measurements to the normal law makes it possible to successfully use all the statistical characteristics of the theoretical distribution in analytical studies and in solving problems of improving technology and normalizing using the contour blasting method. The bulk of the results of downhole measurements of the parameters of contour blasting is in a narrow range of two standards ẋ ± Sx
which allows us to further consider these ratios as criteria for the development of regulatory tolerances for the execution of a Blasting Pattern (BP) that provides practically acceptable contouring accuracy and the quality of the newly formed surface space.
The article discusses the features of the formation of a dynamic stress field and manifestations of rock pressure around hydraulic tunnels. The results of the calculation of the dynamic stresses in the rock mass of the surrounding hydraulic tunnels, the turbine hall, the transformer room of the Rogun HPP are presented. Analytical studies are confirmed by data obtained as a result of observations of the behavior of workings under dynamic loads in production conditions at the construction of hydroelectric power plants. The influence of blasting operations on the development according to the form adopted in hydraulic engineering was also considered. Based on the studies carried out in the chamber sections of the turbine hall and the transformer room of the Rogun HPP, it was found that the maximum and minimum principal stresses σ1
Λσ3 are horizontal, while the stress σ1
in direction coincides with the longitudinal axis of the turbine hall, and σ3
with its transverse axis the average principal stress σ2
is vertical.
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