Javier Macias

Javier Macias
JMConsulting-Rock Engineering AS · Hard rock TBMs evaluation: performances and cutter life, Rock drillability, D&B performances, Rock engineering evaluation

PhD
International Consulting and Research

About

41
Publications
41,162
Reads
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324
Citations
Citations since 2016
28 Research Items
309 Citations
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
Additional affiliations
November 2017 - present
JMConsulting-Rock Engineering
Position
  • Consultant
March 2016 - November 2017
SINTEF
Position
  • Researcher
September 2012 - December 2016
Norwegian University of Science and Technology
Position
  • PhD Student
Description
  • PhD Thesis: "Hard Rock Tunnel Boring: Performance Predictions and Cutter Life Assessments". Trial lecture: "Stability problems in drill-and-blast tunnelling caused by faulted rock - could TBMs tackle these cases, or not?"
Education
September 2012 - December 2016
Norwegian University of Technology and Science
Field of study
  • Hard Rock Tunnel Boring: Performance Predictions and Cutter Life Assessments

Publications

Publications (41)
Article
Full-text available
Performance predictions and cost estimates are often decisive in the selection of excavation methods and have a major influence on the planning and risk management of Tunnel Boring Machine (TBM) excavation projects. A process of great complexity is involved during tunnel boring. When hard-to-very hard rock (i.e., low-to-extremely low boreability),...
Conference Paper
Full-text available
The further development of Tunnel Boring Machines (TBMs) has led to an increasing applicability of this excavation technique in an progressively wider range of rock mass conditions (e.g. increasing rock strength and abrasivity, stress conditions…), as well as, driving lengths and machine diameters. However, the evaluation of potential TBM applicati...
Article
This paper describes the calculation model for instantaneous cutter wear designed as a back-calculation and database tool for cutter consumption in TBM tunneling. The software is designed to process larger amounts of data from e.g. TBM cutter logging. The NTNU instantaneous cutter consumption model calculates the instantaneous cutter consumption al...
Article
This paper investigates the machine performance and cutter life in a mixed ground Tunnel Boring Machine (TBM) project. The paper studies correlations between TBM operating parameters and the corresponding cutter life. The research involves a 2.2 km long tunnel stretch, with extremely complex geological conditions, changing between basalt (UCS up to...
Chapter
The use of hard rock tunnel boring machines (TBMs) has become widely and generally used with success but in too many cases, due to inappropriate assessments, with undesirable consequences. A process of great complexity is involved during tunnel boring. When hard-to-very hard rock (i.e. low-to-extremely low boreability), the complexity is accentuate...
Article
Full-text available
The net penetration rate of hard rock tunnel boring machines (TBM) is influenced by rock mass degree of fracturing. This influence is taken into account in the NTNU prediction model by the rock mass fracturing factor (ks). ks is evaluated by geological mapping, the measurement of the orientation of fractures and the spacing of fractures and fractur...
Article
Cutter consumption and parameters such as cutter ring wear has a great relevance in the overall excavation time and cost in hard rock tunnel boring machines (TBMs), especially in hard rock conditions. Cutter wear involves a complex tribological system that interacts also with the geologicy of the rock mass. Understanding the processes and failure m...
Article
Full-text available
The consumption of TBM disc cutters is influenced by the ground conditions (e.g. intact rock properties, rock mass properties, etc.), the TBM boring parameters (e.g. thrust, RPM, penetration, etc.) and the cutterhead design parameters (e.g. cutterhead shape, cutter layout). Previous researchers have done much work on the influence of the ground con...
Conference Paper
Full-text available
The drill and blast method (D&B) and tunnel boring method (TBM) are widely used with success as tunnelling methods in a wide range of rock mass quality. A 'faulted rock mass' is difficult ground conditions for tunnelling in general, and for TBMs in particular, and comprises from extremely fractured rock mass to completely sheared weak rock. Some of...
Conference Paper
Hard rock tunnel boring has become widely used and is currently an important method employed by the tunnelling industry. The development of tunnel boring machine (TBM) technology has made the approach applicable in an increasingly wider range of rock mass conditions. Technically speaking, excavations can now be carried out in almost all rock condit...
Conference Paper
Full-text available
Drillability is an important parameter in order to assess the influence that intact rock properties have on performance prediction and cost evaluations in connection with drill-and-blast tunnelling, TBM tunnelling, excavations by roadheaders and hydraulic impact hammers and also rock quarrying. Especially in hard rock conditions, drillability will...
Conference Paper
Full-text available
Disc cutter consumption is of great importance when using the Tunnel Boring Machine (TBM) method for tunnelling in hard rock conditions. Abrasive wear is the most common process affecting cutter consumption; therefore good laboratory tests for rock abrasivity assessments are needed to carry out reliable cutter consumption assessments that enable pr...
Conference Paper
Full-text available
The Tunnel Boring Machine (TBM) method has become a widely used method for hard rock tunnelling. The use of TBMs involves major investments and high levels of geological risk, furthermore, the method requires accurate predictions of TBM performance and costs in order to facilitate the control of risk and enable projects to avoid delays and budget o...
Thesis
The use of hard rock tunnel boring machines (TBMs) has become widely and generally used with success but in too many cases, due to unanticipated situations and/or inappropriate assessments, with catastrophic consequences. Hard rock tunnel boring involves major investments and high levels of geological risk, which require reliable performance predic...
Technical Report
The appendix presents the most recent edition of the NTNU prediction model for hard rock TBMs (Macias, 2016). In recent years, a review of the model has been carried out by means of several ongoing and recently completed TBM projects, combined with revisions of the model in response to developments in TBM technology. The review has led to an extens...
Presentation
Full-text available
Stability problems in drill-and-blast tunnels caused by faulted rock – could TBM tackle most of these cases, or not? Trial lecture Francisco Javier Macias Trondheim, 08.12.2016
Article
Full-text available
In order to improve the rock breaking efficiency of hard rock tunnel boring, many innovative rock breaking methods have been proposed (e.g., the water jet cutting, the high-power laser cutting, the impact-rotary drilling, and the undercutting method). However, most of the methods are not applicable to TBMs due to some structural reasons. Aiming on...
Article
Full-text available
Cutter consumption plays a significant role in performance and cost during TBM tunnel boring especially in hard rock conditions. Reliable assessments of cutter consumption will facilitate the control of risk as well as avoiding delays and budget overruns. The new NTNU/SINTEF abrasivity test method RIAT (Rolling Indentation Abrasion Test) has been d...
Presentation
Full-text available
This seminar will highlight the development of this tunnelling technique over the last 20 years and show tunnelling professionals the possibilities of this method.
Article
Full-text available
The tunnel boring machine (TBM) method has become widely used and is currently an important presence within the tunnelling industry. Large investments and high geological risk are involved using TBMs, and disc cutter consumption has a great influence on performance and cost, especially in hard rock conditions. Furthermore, reliable cutter life asse...
Article
The mechanical performance of TBM cutterhead including thrust, torque, eccentric force and overturning moment was calculated and analysed in different mixed rock ground conditions. The calculation model was built by identifying the rock type under each cutter using a ray intersection algorithm and calculating the cutting forces of each cutter using...
Conference Paper
Full-text available
Tunnel boring is shown to be a suitable technique method in hard rock tunnelling. Performance, disc cutter consumption and therefore cost are strongly influenced when using Tunnel Boring Machines (TBMs) in hard rock conditions. Furthermore, good predictions of TBM performance and cost facilitate the control of risk as well as avoiding delays and bu...
Conference Paper
Full-text available
Tunnel boring has shown to be a suitable excavation method on underground expansion. Mining development requires often long tunnels with limited access points which have to be constructed on a limited amount of time. In many cases, Tunnel Boring Machines (TBMs) can be a good choice of tunnelling method. Planning and risk management is of greater im...
Conference Paper
Full-text available
Tunnelling by use of Tunnel Boring Machine (TBM) is gaining a greater presence as a suitable excavation method. Disc cutter consumption has a strong influence on performance and cost when using TBMs and the influence becomes even more relevant in hard rock. Furthermore, good predictions of TBM performance and cost facilitate the control of risk as...
Article
Penetration rates during excavation using hard rock tunnel boring machines (TBMs) are significantly influenced by the degree of fracturing of the rock mass. In the NTNU prediction model for hard rock TBM performance and costs, the rock mass fracturing factor (ks) is used to include the influence of rock mass fractures. The rock mass fracturing fact...
Conference Paper
Full-text available
The right choice of the excavation method is essential in hard rock underground projects. The Drill and Blast (D&B) and Hard Rock Tunnel Boring Method (TBM) are widely and successfully used. Selecting the most appropriate excavation method is not simple as it is depending of several parameters and particular conditions. The purpose of this paper is...
Conference Paper
Full-text available
Thorough and realistic performance and excavation cost predictions is of major importance in the tunnelling industry. For hard rock TBM projects it is even of greater importance, due to the involvement of high investment and geological risk. The net penetration rate is considered the main factor for performance and excavation costs in TBM hard rock...
Conference Paper
Full-text available
TunIn the tunnelling industry, the prediction of TBM performance and costs is an important issue for planning and risk management at the design stages. The NTNU prediction model is an objective tool that has been used by several parties in the tunnelling industry. The model can be used for estimating the excavation rate and costs, as well as planni...
Conference Paper
Prediction of construction time and cost is important to make a reliable choice of excavation method; to avoid schedule delays, budget overruns and to control the risk management for tunnelling projects. For hard rock Tunnel Boring Machine (TBM) projects, penetration rate is a key factor for estimating advance rates, cutter life and excavation cost...
Article
Abrasion on tunnel boring machine (TBM) cutters may be critical in terms of project duration and costs. Several researchers are currently studying the degradation of TBM cutter tools used for excavating hard rock, soft ground and loose soil. So far, the primary focus of this research has been directed towards abrasive wear. Abrasive wear is a very...

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Projects

Projects (4)
Project
Prediction model(s) for penetration rate, advance rate, cutter consumption, time consumption and excavation costs of TBM tunnelling in hard rock conditions. Understanding rock breaking and cutter wear mechanisms.
Project
Cutter consumption and parameters such as cutter ring wear play a significant role in performance and cost predictions, especially in hard rock conditions. Cutter wear involves a complex tribological system in interaction with the geological properties of the rock mass. Understanding the processes and failure mechanisms during cutter wear enabled new knowledge to be applied as part of the development of a new rock abrasivity test method for laboratory use. In addition, cutter wear mechanisms affecting cutter rings during tunnel boring might lead to better cutter consumption predictions and future improvements in cutter ring development.