Abstract
An engineering geological mapping was carried out at the construction site of the Tunnel 10 of Jakarta Bandung High-Speed Railway to obtain data and information of the engineering geological conditions, particularly the rock masses. This research aims to determine the rock mass classes at the tunnel construction site and recommend the tunnel support system based on the Rock Mass Rating (RMR) and the Japan Society of Civil Engineers (JSCE) systems. This research is expected to better understand the rock mass classes, which were previously determined based on the newly applied Basic Quality (BQ) system for the tunnel support empirical design. The results showed that the research area consisted of young volcanic products, namely moderate to highly weathered tuff breccia and andesitic breccia. The uniaxial Compressive Strength (UCS) of rock mass varies between 1-25 MPa. The RMR value ranges from 21 to 40, indicating disintegrated and poor rock mass quality. The proposed tunnel support system is the combination of shotcrete, steel support for top heading and bench support, arch sidewall, and invert concrete.
Highlights
The Tunnel 10 of Jakarta – Bandung High-Speed Railway with 1230 meters of length and a maximum buried depth of 37 meters is located in Ngamprah District, West Bandung Regency, West Java Province of Indonesia
The engineering geological mapping data shows that the study area consists of two mainly lithological units, namely tuff breccia (58.48% of total study area) and andesitic breccia (41.52% from total of area) with poor and weathered condition
This paper describes the lithology unit, distribution, and rock mass quality in the study area and proposes a suitable support system for Tunnel 10 based on the geological condition
Summary
The Tunnel 10 of Jakarta – Bandung High-Speed Railway with 1230 meters of length and a maximum buried depth of 37 meters is located in Ngamprah District, West Bandung Regency, West Java Province of Indonesia. According to the Map of Earthquake Hazard of Indonesia and Digital Elevation Model (DEM) generated from satellite imagery, Tunnel 10 is located between 2 (two) active structures, namely the Cimandiri fault and the Lembang fault, as well as the hilly topography. Cimandiri fault is left-lateral reverse fault with 0.4 – 1.0 mm/ year geodetic slip rate [2, 3] which located 2 kilometers southwest from the study area. Lembang fault is a strike-slip fault with dominant sinistral motion with an inferred fault within the study area. The slip rate of Lembang fault is 1.95 – 3.45 mm/ year [4]. The two active faults in the study area with different movements can form joints in the rock mass. The presence of joints in the rock mass affects the rock mass quality, which is one of the tunnel design parameters
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