Determination of Segari Rock Slope Excavation Technique using Geological Strength Index (GSI)

Determination of residual strength parameters of jointed rock masses using the GSI system

The Geological Strength Index (GSI) system, proposed in 1995, is now widely used for the estimation of the rock mass strength and the rock mass deformation parameters. The GSI system concentrates on the description of two factors, rock structure and block surface conditions. The guidelines given by the GSI system are for the estimation of the peak strength parameters of jointed rock masses. The...

Electromagnetic Pulse Sounding for Geological Surveying with Application in Rock Mechanics and Rapid Excavation Program

Progress toward the development of an electromagnetic pulse sounding probe for the detection and delineation of geological anomalies, primarily in a hard rock medium, is reported. This report covers research performed on Contract H0210042 during the period 24 February 1971 to 23 February 1972. Analytical studies on design data for the probe and on the scattering by planar and spherical contrast...

Application of Schmidt rebound number for estimating rock strength under specific geological conditions

A literature review revealed that most of the empirical equations introduced for determination of the uniaxial compressive strength (UCS) of rocks based on the Schmidt hammer rebound number (N) are not sufficiently reliable mostly due to the relatively low coefficient of correlations. This is attributed to the fact that in most cases one formula is used for all types of rocks, altho...

Oi o CO Seismic Determination of Geological Discontinuities Ahead of Rapid Excavation

Rock Mass Characterization for Diversion Tunnels at Diamer Basha Dam, Pakistan – a design perspective

This research work presents a case study of rock mass characterization on diversion tunnels at Diamer Basha Dam, Pakistan. Geological and geotechnical studies were performed to characterize the rock mass along the axis of diversion tunnel. The core specimens retrieved were tested in laboratory and physical and mechanical properties of the rock mass were determined. Detailed discontinuity survey...