Abstract
The present investigation deals with the engineering geological studies of soil and rock masses in the Wadi Quaz area-Dam No. 2, East of Jeddah. Wadi Quaz area-Dam No. 2, East of Jeddah, Saudi Arabia often faces floods during rainy seasons, so it is so urgent to investigate the area before building any dam or preventing water from flow. Preventing water from flow will produce new dangerous factors such as uplift force which may cause the dam failure. To have a better understanding of the factors that may affect the slope stability, many rock slope locations are observed in detail to assess the effect of discontinuities formed in the rock masses. Fieldwork and Laboratory tests were carried out on soil and rocks. Soils included identification of soil type using unified soil classification system, permeability, water content and field density were done for soils. Rocks include identification of physical and mechanical properties such as: rock type, degree of weathering, rock strength, RQD, joint spacing measurements, and geometric properties (Dip, and Dip direction). Different methods were used to evaluate the potential failure in the studied area depending on rock mass rating and slope stability analysis. The well-known classification of rock masses titled Rock Mass Rating system [1] was used for categorizing the rock masses in the studied area besides slope mass rating [2] which would help to estimate the rock stability. The kinematical analysis was applied to investigate the potential failure mode which might occur in the dam abutments. This paper will provide the stability of dam abutments in both summer season and winter season besides general estimation of the seepage problems related to the soil and according to its permeability.
Highlights
Introduction“Many dams are multipurpose and most dams have at least some flood mitigation effect in addition to their pri-
The present investigation deals with the engineering geological studies of soil and rock masses in the Wadi Quaz area-Dam No 2, East of Jeddah
It is so important to know the size of the problem which may occur around the dam site whether in the soil section or with the rock section
Summary
“Many dams are multipurpose and most dams have at least some flood mitigation effect in addition to their pri-. (2015) Rock Slope Stability Problems in Wadi Quaz-Dam Site No 2, Jeddah-Saudi Arabia. Geological investigations are carried out; the results show that studied area mostly consists of Ande site, and often faces rock slope failures during rainy seasons beside huge flood risks, so it is so important to make sure that is this dam will be strong against water according to the abutment strength and soil permeability. The residences are located near the dam site which have potential hazard of movement, instability and flood Failure of these rock slopes can lead to da Figure 1. The main purpose of this study is to evaluate the dam site No 2, at Wadi Quaz, East of Jeddah by studying the physical and mechanical properties of soil and rock besides investigating the two abutments from each side of the dam whether south abutment or north abutment can be seen in Figure 3 and Figure 4. Studying the dam abutments cut slopes by analyzing them using kinematic approach, Slope Mass Rating (SMR) and Rock Mass Rating (RMR), the potential failure modes of them are identified and the condition of abutments slopes stability is determined
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
