Document Details
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Document Type |
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Thesis |
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Document Title |
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STABILITY ANALYSIS OF SLOPE CUTS ALONG ROAD NO. 8 OF JABAL FAYFA, JAZAN GOVERNATE, SAUDI ARABIA تحليل ثباتية قطوعات المنحدرات على طريق رقم (8) بجبل فيفا بمنطقة جـازان بالمملكة العربية السعودية |
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Subject |
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Faculty of Earth Sciences |
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Document Language |
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Arabic |
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Abstract |
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The purpose of this study is to analyze the stability of slope cuts along Road No.8 of Jabal Fayfa in Jazan governorate, Saudi Arabia. The effect of dryness and saturation conditions of slope cuts on the instability was evaluated. The recommended support systems to stabilize the unstable slopes and blocks were presented. The road has a total length of about 8.3 km and its total width is bout 7m except the lower part.
The study area is consisted of Precambrian layered rocks (Sabya formation) and Precambrian plutonic rock (granite and syenite to monzogranite). Joints, small faults and shear zones were formed within the pluton. Microgranitic and aplitic dykes are observed. Along Road No.8, the soil units are essentially consisted of sand. The rock units show three types of rocks namely; syenite (the common rock), granodiorite and amphibolite.
The study was conducted on twelve stations of soil, twenty nine stations of rocks and fifteen stations of rockfall along the road. In this study, geomechanical methods and advanced software packages were used as follow: Rock Mass Rating (RMR) system, Slope Mass Rating (SMR) system and Modified Slope Mass Rating (DSMR) system to assign the quality of the rock mass and to determine the general support for the rock slope. On the other hand, RocLab software was used to determine the generalized Hoek-Brown strength of a rock mass, DIPS, SLIDE, RocPlane, Swedge and RocPack (III) softwares were used to evaluate the stability of the rock mass and to detect the factor of safety for it, and finally RocFall simulation software was used to predict and simulate the rock fall trajectory and determine the remedial measures. In addition, Surfer and Geomedia were used to draw the maps, and Graph was used to draw mathematical graphs in a coordinate system. The results of the soil and rock masses description indicated that the soil slopes were grouped into nine zones. While the rock masses were grouped into sixteen zones. According to (USCS), most of the soil slopes along the road were classified as poorly graded sand (SP) with or without a small amount of gravel. The rock masses were classified from fair (class III) to good (class II) rock quality according to (RMR) system. The use of (SMR and DSMR) systems for general stability conditions indicated that the rock slopes along the road fell into four categories namely; stable (2 slopes), partially stable (32 slopes), unstable (15 slopes) and completely unstable slopes (9 slopes). The results of DIPS software indicated that most of the rock cuts were prone to failures. The potential toppling failure was the dominant failure on the road. The factor of safety of circular failure under dry and saturated conditions indicated that all of soil and debris slopes were stable under dry condition and also under saturated condition during the light and moderate rainfall. In addition, four stations were unstable during the heavy rainfall. The factor of safety of planar and wedge failures under dry and saturated conditions indicated that about (62%) and (86%) of the slope faces respectively were generally stable. The results of stability analysis of toppling failure under dry and saturated conditions indicated that about (47%) of the slope faces are unsafe. The results of the analysis of rockfall simulation indicated that all of the studied stations were required to barriers to prevent the rock masses or the isolated blocks from falling on the road.
From the results above, it may conclude that all of the stable slopes of soil and rock are not required to any support systems. Most of the unstable slopes are concentrated in the upper part of the road as most of the failure may occur during the heavy rainstorms, which support systems are necessary. The recommended support systems for soil slopes are soil nailing in combination with shotcrete, grading, gabion, or concrete barriers. While, the recommended support systems for dangerous rock slopes are fence, nets with spot shotcrete, systematic bolting, spots, systematic shotcrete, systematic anchors, gravity or anchored wall reexcavation. |
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Supervisor |
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Prof. Dr. Abbas Aifan Al-Harthi |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1432 AH
2011 AD |
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Added Date |
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Saturday, April 16, 2011 |
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Researchers
| وحـيد محمد باعامر | Baamer, Waheed Mohammed | Researcher | Master | |
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