مرکز منطقه ای اطلاع رساني علوم و فناوري - Determination of engineering properties of granodiorites at Deriner dam site by using seismic refraction method (Artvin)

Abstract :

Application of geophysical methods besides geological studies in determining the resistance properties of rock mass including discontinuous provides much more accurate and reliable results. In this study, seismic refraction measurements were done in order to obtain the elastic parameters and quality of rocks at 20 different stations with determined profiles at the Deriner (Artvin) Dam site on both the right and left side. The density (𝜌), the Poisson’s ratio () the shear modulus (𝐺), the bulk modulus (𝑘) and the modulus of elasticity (𝐸𝑆𝐾𝑌) were calculated by using the propagation velocities of elastic waves (𝑃 𝑎𝑛𝑑 𝑆 𝑤𝑎𝑣𝑒𝑠) 𝑤𝑖𝑡ℎin the granodiorite which is dominant rock in the area. The free compressive strength (𝑞𝑢) of the rock mass at the dam site has been calculated using the shear wave velocity (𝑉𝑠), and the rippability of the rock mass was classified by using the longitudinal wave velocities (𝑉𝑝) obtained in the profiles where seismic measurements were done. The rock quality designation(𝑅𝑄𝐷) features of granodiorite outcroped at the Deriner dam site was calculated by utilizing the crack number technique directly on the surface on granodiorite in seismic measurement profile at 20 different stations. The maps of the velocity distributions of the study area obtained in these measurements are given. The relationship between the percentage distribution of the 𝑅𝑄𝐷 values of the granodiorite rock mass at the dam site and the 𝑉𝑠(𝑚/𝑠),𝐺 (𝑀𝑃𝑎) 𝑎𝑛𝑑 𝐸𝑆𝐾𝑌 (𝑀𝑃𝑎) values obtained from the seismic refraction method are investigated. In the study, firstly, the scatter diagrams of these properties were ploted and linear relationships were found between the specified properties.