[This article belongs to Volume - 55, Issue - 06]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-09-06-2023-578

Title : Vulnerability of Ibn Hammad Dam Site, Dead Sea Area, Jordan: Structural, Paleostress and Seismicity Investigations
Masdouq Al-Taj, Khalil M. Ibrahim, Ali El Naqa, Anis Shatnawi, Abebe Ayalew,

Abstract : This study was designed to perform a detailed structural, paleostress, and seismicity analysis of the Jordan Wadi Ibn Hammad dam site and evaluate the dam’s vulnerability. Lithologically, the dam's left abutment was constructed on the Upper Cretaceous rocks, comprised of limestones, silicified limestones, chalk, dolomite, tripoli, and chert. The structure setup of the dam site is controlled by the Dead Sea Transform Fault System (DST), the ENE-WSW segment of the dextral strike-slip Siwaqa Fault, and the extensional NW-SE Karak-Fayha Fault. The stress tensor in the dam area indicates an NW-SE SHmax and NE-SW Shmin. Three main types of fracture trends were detected; a major trend of 0-10° which is compatible with the DST; a 60°-70° trend which coincides with the Siwaqa Fault; and a 120°-130° which coincides with the Karak-Fayha Fault system and the σ1 direction derived from the Tensor program. As a result, rocks are susceptible to rockfall and mass wasting. Therefore, it is necessary to adopt grouting to the bedrock and trimming to reduce rock instability. The risk of rock mass movement into the reservoir region during impounding is significant. Thus, trimming is required to reduce rock instability.