Analysis of the tunnel boring machine (TBM) performance parameters in Ayazaga-Cayirbasi water tunnel project (section III) in Istanbul

This study is about a detailed field and laboratory study concerning Ayazaga-Cayirbasi Water Tunnel Project (Section III) in Istanbul. The excavation and performance parameters of tunnel boring machine (TBM), which is performed in this project, have been investigated. In the first part of the research between February and March 2010, the rock samples were collected from 11 different excavation rings in the tunnel. The performance parameters of the tunnel boring machines (Cutter forces, i.e., thrust force, rolling force, and specific energy values) are also collected during the excavation of the tunnel. In the second part of the research, Point Load Strength and Shore Hardness tests were carried out at the rock excavation laboratories of the ITU Mining Engineering Department on the rock samples collected during the excavation of the TBM in Ayazaga Tunnel Project. Uniaxial compressive strength was determined by Point Load Strength and Shore Hardness (SH) values from every one of rock samples were obtained by Shore Hardness test. As a result findings were compared with the performance parameters of the TBM values and laboratory results statistically. The predicted performance values are compared with field values and some recommendations are made to tunnel contractors and practicing field engineer.