Paper Submission: 25 July 2021
Author Notification: 7 to 10 days
Journal Publication: July 2021
Abdul-Aleam Ahmed Al-Qadhi , Dr.M.R. Janardhana
Engineering properties of the rocks play an important role for designing urban infrastructures in natural hazard prone areas. The entire Taiz city in Yemen is built on volcanic flows and their variants. This paper presents the first report on the description and the engineering characteristics of the Tertiary basaltic lava rock masses in and around Taiz city, Yemen. Geoengineering assessment was made by well established direct and indirect approaches. The direct approach involved the evaluation of physical and mechanical characteristics as well as discontinuity measurements of 23 representative outcrops and field tests. The indirect approach is comprised of characterization of rock masses using Rock Mass Rating (RMR) system and determination of Geological Strength Index (GSI), shear strength parameters (c, φ), compressive strength (σcm), tensile strength (σtm) and deformation modulus (Erm) of the jointed basaltic lava flow rock masses using the generalized Hoek–Brown criterion employing RocLab software program. The basaltic lava flow rocks unit is subdivided into two geotechnical subunits based on field observations viz., (1) jointed basaltic lava flow rocks (JBLTb1/Tb2) and (2) massive basaltic lava flow rocks (MBLTb1/Tb2). Each subunit was further subdivided into zones based on lithology and rock mass structural properties. The attitude of discontinuities was found varying from one location to another. Stereographically, at each investigated site three or four joint sets are identified in addition to other joints orientated randomly. Most of discontinuities strike in NE-SW and NW-SE directions following the trends of the regional faults. According to Jv j/m3, the jointed lava rock masses show moderate to very high degree of jointing while the massive lava rock masses posses low degree of jointing. The jointed basaltic lava flow rocks in the investigated sites also show wide variations in the range of geo-engineering characteristics. For example, values of the shear strength parameters (c and φ) and the other rock mass parameters (σtm, σc, σcm and Erm) increase with increase in the quality of rock mass and with increasing values of the intact rock properties.
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Department of Geology, Yuvaraja’s College, University of Mysore, Mysuru, INDIA email@example.com
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