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Analysis of Support Systems and Excavation Methods Based on Rock Mass Quality in the Intake Tunnel of the Jlantah Dam

Authors: Putera Doni Apriadi; Hendrayana Heru; Setiawan Hendy;

Analysis of Support Systems and Excavation Methods Based on Rock Mass Quality in the Intake Tunnel of the Jlantah Dam

Abstract

Research on the classification of rock mass quality in the intake tunnel Jlantah dam has not been carried out in detail because the research focuses on the location of the main dam so that empirical excavation methods and support systems have not been carried out. The rock mass quality will be used as a parameter in determining the excavation method and tunnel support system that will be used in the Jlantah Dam intake tunnel. The investigation was carried out through engineering geological mapping, core drill evaluation, and supported by laboratory test data based on the Rock Mass Rating (RMR) and Q-system rock mass classification. The rock mass at the research location based on the RMR classification is in class IV (poor rock). Based on the Q-system method, a very poor rock class is obtained. Based on the analysis of the RMR and Q-system methods, the suitable support system for engineering geological conditions such as the intake tunnel of the Jlantah Dam is shotcrete 10 cm thick, steel set with a distance of 1.5 m and rockbolt length of 1.6 m with a distance of 1.5 m. The proper excavation method for the tunnel intake is top heading and bench.

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Subjects by Vocabulary

Microsoft Academic Graph classification: Laboratory test Rock mass rating Excavation Geotechnical engineering Support system Geologic map Rock mass classification Shotcrete Core drill Geology

Keywords

Environmental sciences, GE1-350

1. N.R Barton, R. Lien, J. Lunde, Engineering classification of rock a masses for the design of tunnel support, New York. (1974) [OpenAIRE]

2. Z.T. Bieniawski, Rock mechanics design in mining and tunneling (p. 272). Rotterdam (1984).

3. Z.T. Bieniawski, Engineering Rock Mass Classification, NewYork: John Wiley & Sons (1989)

4. D.U. Deere and D.W. Deere, RQD Index, U.S. Corps of Engineers, Washington DC (1967)

5. E. Grimstad and N. Barton, Updating of the Q system for NMT, in Proceedings of the International Symposium on Sprayed Concrete- Modern Use of Wet Mix Sprayed Concrete for Underground Support, Fagernes: Oslo, page. 46-66 (1993)

6. PT. Aditya, Studi Investigasi Tambahan Untuk DD Waduk Jlantah, Kartasura (2017)

7. Sampurno and H. Samodra, Peta Geologi Lembar Ponorogo, Bandung (1997)

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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