Support design for the diversion tunnel of Diamer Basha Dam, Pakistan, considering the recent developments in empirical systems

11th International Conference on Geotechnical Engineering in Tropical Regions;1st International Conference on Highway and Transportation Engineering 2019

矿业工程;运输工程

Rehman, H.^1^2 ; Naji, A.M.^1^3 ; Ali, W.^2^4 ; Kim, J.^1 ; Abdullah, R.A.^4 ; Yoo, H.K.^1

Department of Civil and Environmental Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan

15588, Korea, Republic of^1

Department of Mining Engineering, Baluchistan University of Information Technology Engineering and Management Sciences (BUITEMS), Quetta, Pakistan^2

Department of Geological Engineering, Baluchistan University of Information Technology Engineering and Management Sciences (BUITEMS), Quetta, Pakistan^3

Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, Johor Bahru

81310, Malaysia^4

关键词: Correlation coefficient;    Current practices;    Drill and blasts;    Geological units;    Individual systems;    Linear correlation;    Rock mass classification;    Rock mass qualities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/527/1/012033/pdf
DOI  :  10.1088/1757-899X/527/1/012033

来源: IOP

【 摘 要 】

The use of rock mass rating (RMR) and tunneling quality index (Q) systems in drill and blast tunneling for support design is necessary in the current practice worldwide as these systems are developed empirically for this particular purpose. However, due to the modifications of individual system, no comparison has been made between their suggested support in tunnel design. Empirical rock mass classification systems are continuously updated to reach a reliable support system for construction of tunnels in rocks. This paper presents the utilization of updated versions of RMR and Q system in empirical support design of a diversion tunnel located at Diamer Basha dam site, Pakistan. The rock mass along the alignment of tunnel is divided into different geological units based on rock mass quality, assessed from borehole data. From comparison of recommended support system by RMR and Q system, it is concluded that the RMR system recommend heavy support as compared to Q system. A linear correlation is also obtained between RMR and Q system for the same rock mass which shows a comparatively better correlation coefficient.