Refinement of the engineering-geological conditions of the foundation of the Khudoni arch dam

Abstract

Additional detailed investigations of the foundation of the Khudoni arch dam performed at the detail design stage made it possible to refine the engineering-geological structure of the rock mass in the foundation of the structure, to evaluate its stress state, and to determine the variability of the physical and mechanical properties of the rock under the effect of natural and technogenic factors. These investigations showed that the structure of the investigated mass is characterized by a greater complexity than was assumed at the contract design stage, and the relatively high characteristics of the physical and mechanical properties of the rock in the interior parts of the mass in many respects are due to the effect of natural (tectonic and gravitational) stresses. With considerations of the results presented, it is necessary to maximally preserve the natural state of the interior parts of the mass when correcting the working drawings and selecting the technology of construction works.