Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Vanyar dam is located near Tabriz city, North West of Iran. The side channel overflow spillway of this dam is located on the left side of dam body with discharge capacity of 1330 m3/sec. To construct this spillway a soil-rock slope with height of maximum 140m is excavated. After about three years, some surface cracks and slides started to develop. This research tries to study the reasons of these instabilities and some approaches are presented to stabilize the slope. This slope is located on too weathered and crushed igneous rocks and weak sandstones. The field studies indicated that the most important reasons of these instability events were rainfall penetration, weathering, freezing and melting cycles, static and dynamic loading conditions, increase in slope height, tectonic conditions and shotcrete covering. To stabilize the slope meanwhile doing back analysis, many methods evaluated and considering to advantages and disadvantages of each method and available equipment, some approaches such as: adjustment of the slope gradients, improvement of drainage system, construction of retaining structure, vegetation and stabilizing instable parts of rocks are recommended as remedy works in this case.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Study of Instability Event of Rock Trench in Vanyar Dam Spillway

Arlington, Virginia

Vanyar dam is located near Tabriz city, North West of Iran. The side channel overflow spillway of this dam is located on the left side of dam body with discharge capacity of 1330 m3/sec. To construct this spillway a soil-rock slope with height of maximum 140m is excavated. After about three years, some surface cracks and slides started to develop. This research tries to study the reasons of these instabilities and some approaches are presented to stabilize the slope. This slope is located on too weathered and crushed igneous rocks and weak sandstones. The field studies indicated that the most important reasons of these instability events were rainfall penetration, weathering, freezing and melting cycles, static and dynamic loading conditions, increase in slope height, tectonic conditions and shotcrete covering. To stabilize the slope meanwhile doing back analysis, many methods evaluated and considering to advantages and disadvantages of each method and available equipment, some approaches such as: adjustment of the slope gradients, improvement of drainage system, construction of retaining structure, vegetation and stabilizing instable parts of rocks are recommended as remedy works in this case.