Abstract
The Chinese Basic Quality (BQ) system was used to determine the rock mass classes and design tunnel support system of the Tunnel No.8 of the Jakarta-Bandung high-speed railway. As the BQ system is newly applied for tunnelling project in Indonesia and remains poorly understood, this research aims to determine rock mass classes at the tunnel construction site and propose the tunnel excavation method and support system alternative based on more widely used rock mass classifications of the Geological Strength Index (GSI) and Japan Society of Civil Engineers (JSCE) standard. Surface engineering geological mapping and evaluation of drill core samples were carried out to obtain accurate interpretation of subsurface engineering geological conditions, particularly the rock mass classes at the tunnel elevation. The results show that the tunnel construction area consists of very poor to fair classes of andesite breccia, tuff lapilli, and tuffaceous sandstone. The full-face method with auxiliary bench cut and multiple-bench cut method are to be applied at the tunnel sections consisting of rock mass classes CI and DII, respectively. The proposed tunnel support system is a combination of shotcrete, rock bolt, steel rib, and invert.
Highlights
The Jakarta – Bandung High-Speed Project, which was built to increase the potential for developing industry, trade, and tourism, has a 142.3 km line with plans to construct 13 tunnels, one of which is Tunnel No 8
One of the crucial factors in planning and construction steps is the characterization of engineering geology conditions in a tunnel construction area and its surrounding
The study area is dominated by volcanic rocks from the Qob Formation in the form of andesite breccia and tuff lapilli seen from the grain size of the constituent materials
Summary
The Jakarta – Bandung High-Speed Project, which was built to increase the potential for developing industry, trade, and tourism, has a 142.3 km line with plans to construct 13 tunnels, one of which is Tunnel No 8. Tunnel No 8 is located on DK 97+320 to DK 99+510 with a length of 2190m. The tunnel built to accommodate a double railway track is located on a hill with undulating topography and hills covered with vegetation. A Tunnel is one of underground construction that requires many factors. Factors that need to be considered are the planning stage to the maintenance, and social impact after the tunnel is operational. That kind of factor makes the construction of a tunnel such complex construction. One of the crucial factors in planning and construction steps is the characterization of engineering geology conditions in a tunnel construction area and its surrounding
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