Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

Al-Hada descent lies at the western region of Saudi Arabia at elevation of about 2000m, characterized by sharp cliff. Al-Hada descent road was constructed with an elevation difference of 1500m between the highest and lowest heights along the road. The road alignment is intersected by 8 very steep gullies of almost 60 to 80 degrees. The gullies contain large quantity of mud, old levees and large rock blocks. Al-Hada descent road hit two weeks ago with heavy rainfall last about 2 hours. The rainstorm initiates 11 debris flows on steep gullies, and caused them to travel rapidly down along the gully channel. Once the flow reaches a less confined area at the retaining wall, it partially destroy the gabions above it, and edges of the retaining walls across the gullies and overflow them, as they received more rolling, sliding and bouncing rocks from higher steep elevations. The moving debris flows spread out, loose speed and deposited beyond the highway opposite side. Temporary solution is made by removing almost 100.000m3, of the debris flow in one gully and scaling the remaining debris body to an angle of more than 35°. A permanent solution for this case history is under intensive study.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Rainfall-Induced Debris Flows Case History Along Al-Hada Descent Highway West of Saudi Arabia

Chicago, Illinois

Al-Hada descent lies at the western region of Saudi Arabia at elevation of about 2000m, characterized by sharp cliff. Al-Hada descent road was constructed with an elevation difference of 1500m between the highest and lowest heights along the road. The road alignment is intersected by 8 very steep gullies of almost 60 to 80 degrees. The gullies contain large quantity of mud, old levees and large rock blocks. Al-Hada descent road hit two weeks ago with heavy rainfall last about 2 hours. The rainstorm initiates 11 debris flows on steep gullies, and caused them to travel rapidly down along the gully channel. Once the flow reaches a less confined area at the retaining wall, it partially destroy the gabions above it, and edges of the retaining walls across the gullies and overflow them, as they received more rolling, sliding and bouncing rocks from higher steep elevations. The moving debris flows spread out, loose speed and deposited beyond the highway opposite side. Temporary solution is made by removing almost 100.000m3, of the debris flow in one gully and scaling the remaining debris body to an angle of more than 35°. A permanent solution for this case history is under intensive study.