Identification of heavy weight type roadheaders performance based on field data

Abstract

In Japan, it is necessary to excavate many hard rock tunnels using a heavy weight (200-300kW class) axial and transverse cutter head type roadheaders, which has reason for various conditions of saving the environment from the construction site and so on. And the performance of a heavy weight axial and transverse cutter head type roadheaders is a critical issue in assessing technical and economic feasibility of its application in many tunneling projects. Therefore, the authors have established a database of heavy weight axial and transverse cutter head type road-headers performance, which based on the interview for engineer's of many tunnel construction projects. This database contains field data from the civil construction operations all over Japan, includes a variety of heavy weight roadheaders of different geotechnical conditions and different cutter head type. And, this database refers to accurate estimation of the production rate, machine utilization and picks consumption for different geological units to be encountered on the tunnel project planning. This paper presents and discusses the performance estimation model of instantaneous cutting rate (ICR) and pick consumption which was introduced rock quality designation index (RQD) from this database. Especially this database established form hard rock tunnel excavated data using heavy weight (200-300kW class), axial and transverse cutter head type road headers.