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This paper is aimed at thedescription and the geotechnical characterization of the Tertiary granitic rock masses of the northern face of Sabir Mountain, Taiz city, Yemen, for the first time. For accomplishing this task, direct and indirect approaches are adopted. The direct approach is represented by field and laboratory investigations. Field investigations include discontinuity (joints) measurements/evaluation, applied Rock Mass Rating (RMR) system and Geological Strength Index (GSI) system, in addition to field tests, while laboratory investigations encompass physico-mechanical tests carried out on granitic rock materials. Indirect approach for the estimation of shear strength parameters (c, O), compressive strength (σcm), tensile strength (σtm) and deformation modulus (Erm) of these rock masses was made by applying the generalized Hoek–Brown failure criterion using geotechnical Roc-Lab software. The laboratory results indicate that the Tertiary granitic rock masses show wide range of variations in their physico-mechanical characteristics owing to degree of weathering /alteration and microfractures. The intact samples of Sabir granitic (Tg) rocks show "Moderate"to "High"density, "Low"to "Medium"porosity, "Good"to "Marginal"water absorption capacity and "Weak"to "Very Strong"strength. Stereographically, three main sets of discontinuities (joints) are identified at each station; however, the fourth joint set occurs, in addition to random joint sets. The discontinuities (joints) trend predominately in NE-SW and NW-SE directions in conformity with the regional structures or faults. According to Jv j/m³values, the degree of jointing of these rock masses are varied from "Moderate"to "High"jointing. These rocks are categorized as "Fair"to "Excellent"quality, "Fair"to "Good/Very Good"quality and "Poor"to "Very Good"quality classes according to RQD, RMRb89and GSI respectively. Values ofthe shear strength parameters (c and O) and the other rock mass parameters (σtm, σc, σcmand Erm) show variations depending on the rock mass quality and properties of intact rock. However, in general the values of the rock mass parameters are found to increase with increase in the quality of rock mass and intact rock properties.

Geoengineering Characterization of the Rock Masses of Northern Face of Jabal Sabir, Taiz City, Yemen