Field Deformation Tests at the Construction Site of HPP Structures in Uzbekistan

This article presents an analysis of the conducted studies aimed at determining the properties of rock materials used in the construction of the Pskem HPP dam. Engineering-geological surveys were carried out at the dam construction site. Deformation tests were conducted using the static loading method on the rock surface through a rigid concrete stamp.
The fracture void coefficient was determined at the test stamp sites. The deformation modulus (E) was calculated based on the loading branch by varying the normal pressure from zero to the maximum value (σmax) within the studied cycle. The calculated deformation and elasticity moduli were derived from load-unload cycle tests, in which specific normal loads reached levels corresponding to the maximum operational loads on the dam foundation.
Following the deformation tests, shear tests were performed on the same concrete stamps. The article presents the results of geomechanical studies of the aleurolite rock massif, conducted in the right-bank experimental adit at the Pskem HPP dam construction site.