GEOLOGYCAL INVESTIGATION AND ROCK EXCAVATION IMPACT TO GROUND WATER IN TUNNEL CONSTRUCTION AREA IN NOTOG

• Main Author: SOFYAN (NIM : 12113057), MUHAMMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23342
• Institution: Institut Teknologi Bandung

In the planning of tunnel construction, geology condition surrounding tunnel construction area is the primary matter to be known specifically. This matter is related to what kind of rocks that will be passed by the tunnel and also the probability existence of the geology structures such as fault will impact the buffering type planning which will be implemented to the tunnel. Furthermore, ground water is one of the primary matter in tunnel digging activities. Water contained in rocks, other than weakening the strength of the rocks to support itself also can enter the tunnel through the interconnected fractures. The entry of the water to the tunnel can disturb the rock mass excavation because the floor will be muddy. This research done through data taking on the field such as rock outcrop, measurement well data, wellsprings data, and geology structures data that develop on the research area. Also there’s secondary data exists such as drill hole, resistivity methods data, and rock permeability that hereafter manage to get the geology and hydrogeology condition pictures which later forming the research area. Other than that, through this research, can determine the impact of rock mass digging in tunnel doing activity to ground water condition such as decrease of ground water level in research area. The result of those data processing show that research area arranged by sedimentary rocks which aged Middle Miosen to Pliosen with geology structures existence such as flat fault. Ground water modeling shows there’s a significant decrease in ground water level as the effect of rock mass excavation on tunnel construction in some monitor well (B1, B4, B5, and B6). The prediction rate of the water flow into the tunnel averaged 3,86 m3/day.