EXCAVATABILITY METHOD BASED ON ENGINEERING GEOLOGY CONDITIONS IN THE CONSTRUCTION OF RUKOH DAM SUPPLETION TUNNEL, INDONESIA

Z B Harwinda^1,2,W Wilopo^[1]* and I G B Indrawan¹

¹ Department of Geological Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia

² Ministry of Public Works and Housing, Jakarta, Indonesia

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art25

ABSTRACT

Determination of excavation technique was one of the essential factors in tunnel construction stability. It also had an impact on the efficiency of the construction phase. However, in the Detail Engineering Design of the Rukoh Dam Suppletion Tunnel, there was no study of the most optimal excavation technique in the construction phase. This study aimed to assess the efficiency of excavation capabilities based on engineering geology conditions. The parameters used in this study are RMR values, GSI values, If-index (discontinuity spacing), Point Load (Is50) values, and Excavation Power Index (EPI). The excavatability classification used the method developed by Abdullatif and Cruden, Pettifer and Fookes, and Tsiambaos and Saroglou. The procedure for evaluating efficiency used the EXCASS system. The tunnel’s rock mass quality was poor calcareous siltstone. The excavation method in the tunnel was the top heading and bench with a stand-up time of 10 hours for a 2.5 m span. Based on the result, the most optimal excavation technique used was the easy ripping method for zones 1 and 4, while the digging method was for zones 2, 3, and 5. Even though the recommendations were classified, project cost efficiency studies are required to bolster the recommendations.

Keywords: excavation technique, rukoh dam suppletion tunnel, EXCASS system

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