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Empirical Support Design for Proposed Diversion Tunnels at Dasu Dam Site Pakistan

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Title: Empirical Support Design for Proposed Diversion Tunnels at Dasu Dam Site Pakistan

Authors: Muhammad Bilal, Muhammad Zaka Emad, Fawad Ul Hassan, Zaheer Ahmed

Journal: Pakistan Journal of Scientific and Industrial Research (Series A: Physical Sciences)

HEC Recognition History
Category From To
Y 2023-07-01 2024-09-30
Y 2022-07-01 2023-06-30
Y 2021-07-01 2022-06-30
Y 2020-07-01 2021-06-30
Y 1900-01-01 2005-06-30

Publisher: Pakistan Council of Scientific and Industrial Research

Country: Pakistan

Year: 2021

Volume: 64

Issue: 2

Language: en

DOI: 10.52763/PJSIR.PHYS.SCI.64.2.2021.131.136

Keywords: rock mass classificationRMRQ-system

Categories
Geotechnical Engineering (527) Engineering Geology (42) Civil Engineering (3503) Rock Mechanics (59) Dam Engineering (5)

Abstract

 
This research work presents the rock mass characteristics and tunnel support system recommendations for hydroelectric power tunnels at Dasu dam site Pakistan. Two inverted U-shaped tunnels are proposed at the left bank of Indus river. The tunnels have inlet portals at an elevation of 773.00 m and outlet portals at an elevation of 758.00 m. The thickness of rock cover above the tunnels is between 100 and 200 m. Three types of rock are encountered at project site including Granulite, Amphibolite and Gabbronorite. Granulite rocks are encountered along the alignment of tunnels. Rock mass is classified using Rock mass rating (RMR) and Tunneling quality index (Q system). Support system is suggested based on values of Q and RMR. Correlation between Q-index and RMR is also derived.
 
 

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