Document Details

Document Type : Thesis 
Document Title :
ASSESSMENT AND MITIGATION OF SLOPE STABILITY HAZARDS ALONG RAYDAH ESCARPMENT, ASIR GOVERNATE, SAUDI ARABIA
تقييم خطر ثباتية الميول وطرق المعالجة على طول عقبة ريده، بجبل السودة، بمنطقة عسير بالمملكة العربية السعودية
 
Subject : Faculty of Earth Sciences 
Document Language : Arabic 
Abstract : The purpose of this study is to evaluate the slopes stability along Raydah descent road NW of Abha city on As Sawdah Mountain affiliated to Asir Region Governorate. The recommended support and mitigation measures to stabilize the unstable slopes and blocks were presented. Raydah road connects certain villages (Raydah village) on the coastal plain with Sawdah Mountain and Abha city. Sawdah Mountain and Abha are tourist areas attracting visitors throughout the year and especially during summer. Raydah descent road is about 9 km long and 6 meters wide. The highest point rate of the way is about 2800 m above sea level and the lowest point is 1500m above sea level. The study area rocks are considered of Baish Group. The road track includes metamorphic rock of meta-basalt, meta-gapro, meta-diorite, slate, and crystal tuff. Along Raydah descent, the soil units are essentially consisted of mixtures soil. In the study area the rocks are generally affected by six sets of joints and four sets of small faults or weakness zones are observed in some sites. The studied road divided into seventy three stations including fourteen sites classified to be from soil surface slopes and fifty nine sites to be from rock cuts slopes. The description of the rock mass by the Geological Society of London(1977) was used to categorize the studied road. The results show that, the studied road was subdivided into ten zones, while the soil masses were grouped into eight zones based on the difference of soil types and the results of engineering properties for them. The classification of the rocks using RMR-System was used to classify the rock mass quality for the purposes of rock slopes, while the classification of the soil were classified adopting Unified Soil Classification System (USCS) The rock fall and stability assessment of slopes cut was done using different techniques including: 1) Rock Fall Hazard Rating-system (RHRS) "Oregon's RHR" and "Colorado's RHR", for each station of studied; 2) DIPS and SLIDE software programs for critical slopes cut according to discontinuity structural control and limit equilibrium for circular failures; 3) Using field simulation and ROCKFALL software program to determine the impact of the rolling and bouncing blocks on the road. Most of the critical slopes are diffused along of the road. The general recommendations for rock-fall hazards remedial measures are toe ditch construction, building of barriers, surface drainage, and mechanical removal of failing blocks. Rock bolting with wiremesh and systematic shotcrete are the required support system for unstable rock slopes face. 
Supervisor : Prof. Abbas A. Al-Harthi 
Thesis Type : Master Thesis 
Publishing Year : 1432 AH
2011 AD 
Added Date : Sunday, May 8, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
محمد محسن الكثيريAL-KATHEERY, MOHAMMED MOHSINResearcherMaster 

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