ROADHEADER PERFORMANCE ANALYSIS FOR NANJUNG WATER TUNNEL EXCAVATION

• Main Author: Wahyu Hidayat, Dhany
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/41854
• Institution: Institut Teknologi Bandung

The Nanjung Tunnel is a parallel tunnel construction project for waterways, each of which has a length of 230 meters. The making of The Nanjung Water Tunnel uses the New Austrian Tunnelling Method (NATM) method with roadheader as their main excavation tool. The roadheader moves transversely, breaking the rock with chipping mechanism using pick with a pointy attack pick. During the excavation activities, planning needs to be done to ensure the performance and productivity match with needs. The Excavation Productivity Estimation is obtained based on cutting forces acting on pick and by using the equations from Bilgin (1990), Copur (1997), and Ebrahimabadi (2010). The powers required to excavate rocks in certain conditions is obtained from the cutting force of the roadheader. From the powers, the productivity value of the roadheader is obtained. Meanwhile, according to Bilgin (1990), Copur (1997), and Ebrahimabadi (2010), the value of roadheader productivity is generally influenced by rock compressive strength (UCS), rock tensile strength (UTS), RQD value, machine power and machine weight. In every empirical equation, not every parameter is used. The actual productivity value will also be compared with the estimated value of productivity to be analysed and evaluated. Based on the calculation and analysis results, the cutting force for one pick is 1.86 kN. The machine powers requirement is 54 kW with an estimated productivity of 28.18 m3/hour. This estimation technique results are lower compared to actual condition which is 32.28 m3/hour with deviation value of -12.7%. In addition, the Ebrahimabadi (2010) empirical equation has the smallest deviation value of -14.97% of actual productivity, when compared with other empirical equations. To obtain the correlation between the parameters that work with the actual productivity of the roadheader in the field, a dimensional analysis is performed.