TBM performance and disc cutter wear prediction based on ten years experience of TBM tunnnelling in Iran. Accurate estimation of rate of penetration (ROP), daily rate of advance (AR), and cutter cost/life is necessary for the justification and successful use of a TBM on any tunneling project.
hard rock tunnel boring machine using collaborative optimization Wei Sun 1, Xiaobang Wang1,MaolinShi1, Zhuqing Wang2 and Xueguan Song1 Abstract A multidisciplinary design optimization model is developed in this article to optimize the performance of the hard rock tunnel boring machine using the collaborative optimization architecture.
TBM Design for Long Distance Tunnels: How to Keep Hard Rock TBMs boring for 15 km or More. LONG DISTANCE TBMs TBMs for 15 km or More INTRODUCTION + Challenges of Tunneling at Long ... tunnel) + High cutter wear required the switch to Robbins robust cutters at several tunnel sites
In hard rock TBM tunneling, disc cutter wear is caused not only by initial fragmentation of a rock face but also by fragmentation of residual rock pieces and blocks between a cutterhead and a rock face. These phenomena are considered as primary fragmentation and the secondary one, respectively.
TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND FUTURE CHALLENGES ZHAO Jian ... made 5 m/day advance rate. Gotthard tunnel (), the longest (15 km) ... de Mécanique des Roches −LMR Start of rock TBM (1951), at the Oahe Dam (shale) and later at the Humber Sewer (hard rock) tunnels. Seikan tunnel (197288), 54 km long with undersea ...
Fullface tunnel boring machine (TBM) performance during the excavation of six tunnels is considered in terms of utilization, penetration rate, and cutter wear. Construction records for over 75,000 ft (22,860m) of tunnel in sedimentary rock are analyzed, and the results are used to investigate factors affecting TBM performance.
of energy transfer to the rock and the attainable rate of penetration. Single disc cutters are the most commonly used roller cutters for hard rock TBMs. The cut spacing and the depth of penetration per cutter head revolution define the efficiency of rock cutting by disc cutters. As would be expected, the
The TBM cutter wear causes not only low performance of tunneling but also the additional cost of cutter discs and potential safety hazard in construction. Excessive cutter wear and replacement were observed in tunneling with a TBM through sandy cobble stratum in Chengdu metro Line 1. Comparison with other geological layer, the ground has leaded to more cutter wear.
Jan 23, 2019· The 48 to 82 MPa UCS rock, with a high abrasivity and quartz content, did cause some wear to the cutterhead, though cutter consumption for the whole tunnel was less than predicted.
Jun 13, 2015· Tunnelling underground design (Topic5hard weak rock tunnelling) 1. 1 1 of 59 Tunnelling Grad Class (2015) Dr. Erik Eberhardt EOSC 547: Tunnelling Underground Design Topic 5: Hard Weak Rock Tunnelling 2 of 59 Tunnelling Grad Class (2015) Dr. Erik Eberhardt Tunnel Excavation in Rock It is instructive to consider the fundamental objective of the excavation process .
THE CERCHAR ABRASIVITY INDEX'S APPLICABILITY TO DREDGING ROCK L. A. Prieto1 ABSTRACT This paper proposes the application of one of the most useful rock testing procedures, the Cerchar abrasivity test to predict the rate of wear of cutterhead and excavator bucket teeth in dredging, especially in rock. These predictions
And cutter consumption due to wear accounts for 30% of the total construction cost (Tan el al., 2015). The ratios listed above are higher when driving in hard rock. In order to reduce disc cutter costs and improve the driving efficiency, scholars have carried out a lot of researches on wear mechanism and wear rate prediction of disc cutter.
Tunnel boring machines (TBM) utilize cutter discs as a primary tool for cutting through hard rock. The discs are mounted on a rotating, circular cutter head which is pressed against the rock. A microscopical examination of worn cutter discs has been carried out.
The goal of the new test design and procedure is to reproduce wear behaviour on hard rock tunnel boring in a more realistic way than the traditionally used methods. Wear by rolling contact on intact rock samples is introduced and several rock types, covering a .