Abstract
The empirical design of tunnel 7 of the Jakarta-Bandung high-speed railway was based on the Basic Quality (BQ) system, which was the Chinese standard of rock mass classification. Due to the high uncertainty of a rock mass classification, comparative studies of rock mass quality and tunnel support systems based on other rock mass classifications are commonly required. The main objective of this research was to assess the rock mass quality and excavatability at the tunnel construction site and propose the tunnel support system based on three widely used methods, namely GSI, RMR, and Q-system. This study involved geological mapping, determination of surface and subsurface rock weathering, rock mass classification of drilling cores, and laboratory testing. The results show that the tunnel construction area consists of highly weathered volcanic and sedimentary rocks. The tunnel elevation consists of poor and extremely to very poor rock masses of sedimentary rocks. Hard digging is the optimum rock mass excavation method to use. Applications of rock bolt, wire mesh, and shotcrete are proposed for the tunnel support system.
Highlights
The Jakarta - Bandung high-speed railway Tunnel 7 Project is in West Bandung Regency, West Java Province (Fig. 1)
The geological surface engineering study site is divided into four units of engineering geology, namely highly weathered laharic breccias, highly weathered volcanic breccias, highly weathered siltstone, and highly weathered sandstone intercalated with claystone as shown in figure 6
The study area consists of highly weathered laharic breccias, highly weathered volcanic breccias, highly weathered siltstone, and highly weathered sandstone intercalated with claystone
Summary
The Jakarta - Bandung high-speed railway Tunnel 7 Project is in West Bandung Regency, West Java Province (Fig. 1). The field study conducted including geological mapping, engineering geological mapping, mapping of surface and subsurface rock weathering, observations of core drilling results, and sampling for laboratory testing The planners designed this high-speed train tunnel based on the Professional Standard of The People's Republic of China "Code for Design on Tunnel of Railway." This guide uses the Basic Quality (BQ) rock mass classification issued by the Chinese government (Standard for Engineering Classification of Rock mass). Due to the high uncertainty in a rock mass classification, it is necessary to do a comparative analysis of rock mass quality using other widely used methods such as Rock Mass Rating (RMR), Q-system, and Geological Strength Index (GSI). The rock-mass rating (RMR) and tunneling quality index (Q) systems are used as empirical design tools in many rocks engineering. The results of this study are expected to contribute to tunneling on weak rock masses, provide input for stakeholders, and help promote tunnel technology in the transportation sector in Indonesia
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