rock mechanical aspects of roadheader excavation

roadheaders for soft rock Le Palais du Dragon

roadheaders (in fairly soft rock). For example, the Herrenknecht shaft boring roadheader can mine to a depth of 1000 m in soft, heterogeneous rock (Herrenknecht, 2016). As the depth of the shaft increases it usually progresses into competent rock, which may have medium to high compressive strength, and which may require other means to excavate it.

Theory and Technology of Rock Excavation for Civil

This book summarizes the technical advances in recent decades and the various theories on rock excavation raised by scholars from different countries, including China and Russia. It not only focuses on rock blasting but also illustrates a number of nonblasting methods, such as mechanical excavation

Performance predictions for mechanical excavators in Yucca

@article{osti_138882, title = {Performance predictions for mechanical excavators in Yucca Mountain tuffs Yucca Mountain Site Characterization Project}, author = {Ozdemir, L and Gertsch, L and Neil, D and Friant, J}, abstractNote = {The performances of several mechanical excavators are predicted for use in the tuffs at Yucca Mountain: Tunnel boring machines, the Mobile Miner, a roadheader, a

construction roadheader germany mobilistico

Rock Mechanical Aspects of Roadheader Excavation • A roadheader will allow excavation with minimum vibration emission and precise profiling of the contour • However the method is very sensitive to the geomechanical properties of the rock mass and once employed at the project site the power transferrable energy of the machine cannot be increased

Rock Mechanics in Underground Construction

11/10/2006 · Thermomechanical behaviors of rock masses around underground LNG storage cavern are evaluated by analyzing insitu rock mass responses measured at the Daejeon pilot cavern and a 2dimensional numerical model of a lined LNG rock pilot cavern with UDEC and PFC2D, with aims to estimate the temperature profile in the containment system including the surrounding rock mass and

Roadheader Excavation Performance Geological And

ABSTRACT: The prediction of tunnel stability usually is the main subject in geotechnical site investigations prior to tunnelling projects. During the last few years in mechanical excavation, problems have occured also connected with the accurate prediction of excavation performance and tool wear in soft and hard rock.

UNDERSTANDING UNDERGROUND

different excavation and working methods. Whether drill and blast, mechanical excavation or hammer tunneling is the best choice depends on various aspects related with the project at hand, such as geology and rock conditions. ''s expertise covers all these methods, helping you to get the most out of your investment.

Advanced Rock Tunnelling Engineering Solutions WSP

A roadheader is used as a mechanized method of cutting that has more precise cutting, less vibration, and no overbreak. Recent developments allowed the excavation of rock tunnels in very hard rock. The basic cutting tool is a very large milling head mounted on

Understanding underground Interempresas

Whether drill and blast, mechanical excavation or hammer tunneling is the best choice depends on various aspects related with the project at hand, such as geology and rock conditions.

NATMEngineer Course Content ITAAITES

Excavation methods in soil and rock typical fields of appliion, criteria and limitations Design of tunnel profiles: use of ACAD Aim: Ability to perform geotechnical design from the evaluation of exploration results to structural design.

Roadheader Excavation Performance Geological And

ABSTRACT: The prediction of tunnel stability usually is the main subject in geotechnical site investigations prior to tunnelling projects. During the last few years in mechanical excavation, problems have occured also connected with the accurate prediction of excavation performance and tool wear in soft and hard rock.

(PDF) Rock Mechanical Aspects of Roadheader Excavation

Rock Mechanical Aspects of Roadheader Excavation The very low vibration emissions and precise profile of a roadheader excavation may effectively contribute especially to projects with sensible

Tunnel construction and ground reinforcement: general aspects

high energy impact hammer, mechanical excavator, etc.). The excavation can be carried out full face or parzialized excavation subdividing the face in smaller separate attacs, with or without preventive reinforcement of the ground Full face mechanised continuous excavation method using Rock TBM for the excavation of tunnels in rock.

Hard rock tunnel boring, cutting, drilling and blasting

mechanical rock properties. But rock mass conditions also highly depend on the geological history, weathering conditions, hydrothermal decomposition and the structure of discontinuities. The last important factor influencing rock excavation performance is the working process itself. Firstly, smooth

Excavation Technology for Hard Rock Problems and Prospects

Excavation Technology for Hard Rock Problems and Prospects S. T. 1A. Gillani, N. Butt1 1 Department of Geological Engineering, University of Engineering and Technology Lahore, Pakistan. Abstract Civil engineering projects have greatly benefited from the mechanical excavation of hard rock logy.

Arch. Min. Sci. 64 (2019), 4, 797812

employed as part of mechanical excavation. In this sense, prior to the excavation process, rock strength, hardness, rock matrix, faults, ground water and so on should be examined in detail to obtain maximum cutting efficiency. In classical methods, the drilling time of rock drills accounts for 1520% of the total excavation progress.

5 Ground behaviour Rock engineering

This may be the case for small values of the block volume up to stone size or minor blocks. 5.5 Effect of the excavation and installation of the rock support In many cases, the best excavation method to use is found from the layout of the opening, the ground conditions and other requirements, such as the construction time and environmental aspects.

TBMD&B2

mechanical excavation. The authors attri bute the low accident rate in the Channel Tunnel to its length. Is it the length, the rigorous coordination or the project man agement? Whatever the case, it is possible to conclude from the data that mechanical excavation can produce accident statistics equal to or better than mechanical excava tion.

Roadheader – A comprehensive review ScienceDirect

Mechanical excavators are preferred to conventional drilling and blasting as blasting poses several regulatory and operational issues. The roadheader is a machine for excavating rock in mining and civil construction projects. It is a hybrid machine, with better manoeuvrability than that

Hard rock tunnel boring, cutting, drilling and blasting

Hard rock tunnel boring, cutting, drilling and blasting: rock parameters for excavatability Thuro, K. Plinninger, R.J. ETH Swiss Federal Institute of Technology Zurich, Switzerland Dipl g. Bernd Ge Ingenieur , Munich, Germany ABSTRACT: Determining tunnel stability is a key issue during preliminary site investigation.

The Importance of Research on Alternative and Hybrid Rock

1/27/2017 · Current methods of mechanical excavation of rock are limited in regard to the material which can be extracted economically. The use of roadheaders with pick tools has the advantage of high flexibility in form of turn off radii down to 1 m but is limited by rock strength to figures below 150 MPa UCS. While mechanical rock excavation machines with disc cutters can handle rock strengths above

Controlled drill & blast excavation at AECL`s Underground

@article{osti_405276, title = {Controlled drill & blast excavation at AECL`s Underground Research Laboratory}, author = {Kuzyk, G W and Onagi, D P and Thompson, P M}, abstractNote = {A controlled drill and blast method has been developed and used to excavate the Underground Research Laboratory, a geotechnical facility constructed by Atomic Energy of Canada Limited (AECL) in crystalline rock.

Advanced Rock Tunnelling Engineering Solutions WSP WSP

A roadheader is used as a mechanized method of cutting that has more precise cutting, less vibration, and no overbreak. Recent developments allowed the excavation of rock tunnels in very hard rock. The basic cutting tool is a very large milling head mounted on

Advanced Rock Tunnelling Engineering Solutions WSP WSP

A roadheader is used as a mechanized method of cutting that has more precise cutting, less vibration, and no overbreak. Recent developments allowed the excavation of rock tunnels in very hard rock. The basic cutting tool is a very large milling head mounted on

Multifactor Analysis of Roadheader''s Body Pose Responses

Based on the Lagrange equation in system dynamics, aiming at the horizontal cutting process, the dynamical coupling model of boomtype roadheader''s body pose was established. According to input problem of solving the model, a calculation method of the cutting head load was proposed, and the relationship between the cutting head load and pressure of the driving cylinders and swing angle of

Rock Mechanical Aspects of Roadheader Excavation OnePetro

Hard rock excavation by roadheaders presents an interesting alternative to mechanical excavation methods or conventional drill and blast excavation. The very low vibration emissions and precise profile of a roadheader excavation may effectively contribute especially to

Roadheader Excavation Performance Geological And

ABSTRACT: The prediction of tunnel stability usually is the main subject in geotechnical site investigations prior to tunnelling projects. During the last few years in mechanical excavation, problems have occured also connected with the accurate prediction of excavation performance and tool wear in soft and hard rock.

The Importance of Research on Alternative and Hybrid Rock

Current methods of mechanical excavation of rock are limited in regard to the material which can be extracted economically. The use of roadheaders with pick tools has the advantage of high flexibility in form of turn off radii down to 1 m but is limited by rock strength to figures below 150 MPa UCS.

The Influence of Heading Rate on Roof Stability in Coal

Coal entry heading is one of the most hazardous activities in coal mine operations because a certain area of an unsupported roof inevitably forms and poses a significant threat to the safety of miners. In order to accelerate the coal entry heading, a simplified method including theoretical analysis and laboratory and in situ tests was developed to predict the influence of heading rate on the

Rock Mechanical Aspects of Roadheader Excavation

Rock Mechanical Aspects of Roadheader Excavation Uwe Restner Mining and Construction G.m.b.H., Hard Rock Continuous Mining, Zeltweg, Austria role for rock excavation and tool wear

roadheaders for soft rock Le Palais du Dragon

roadheaders (in fairly soft rock). For example, the Herrenknecht shaft boring roadheader can mine to a depth of 1000 m in soft, heterogeneous rock (Herrenknecht, 2016). As the depth of the shaft increases it usually progresses into competent rock, which may have medium to high compressive strength, and which may require other means to excavate it.

Theory and Technology of Rock Excavation for Civil

This book summarizes the technical advances in recent decades and the various theories on rock excavation raised by scholars from different countries, including China and Russia. It not only focuses on rock blasting but also illustrates a number of nonblasting methods, such as mechanical excavation

The Robbins Company REPORT TUNNELING COST REDUCTION STUDY

The rock is generally competent with widely spaced jointing, and slowdoWn of the operation for the installation of rock support is expected to be minimal. The tunneling system will have to be equipped with the necessary equipment for an efficient response to poor rock conditions however.

Estimation of Rock Cuttability from Shore Hardness and

10/17/2006 · Shore hardness has been used to estimate some mechanical and physical properties of rocks for many years. This study differs from previous studies in a way that it is directly oriented to rock cuttability. Two Shore hardness values (SH 1 andSH 2) and a coefficient of deformation value (K) have been measured for 30 different rock samples.

Some geological and geotechnical factors affecting the

Mechanical excavation method was chosen to minimize the ground disturbance beneath the railway, freeway and highway loed between the Nuh Cement Plant and the Dock. Based on the geological and geotechnical information of the project site, a doubleshielded roadheader cutter boom was considered to be well suited for the job.

Roadheader – A comprehensive review ScienceDirect

Mechanical excavators are preferred to conventional drilling and blasting as blasting poses several regulatory and operational issues. The roadheader is a machine for excavating rock in mining and civil construction projects. It is a hybrid machine, with better manoeuvrability than that

The Importance of Research on Alternative and Hybrid Rock

Current methods of mechanical excavation of rock are limited in regard to the material which can be extracted economically. The use of roadheaders with pick tools has the advantage of high flexibility in form of turn off radii down to 1 m but is limited by rock strength to figures below 150 MPa UCS.

Hardrock abrasivity investigation using the Rock

The term "abrasivity" describes the potential of a rock or soil to cause wear on a tool. Consequently, abrasivity is an important rock parameter to be determined and to be described in the course of any larger road, tunnel or mining project in order to allow the contractor to assess economical aspects of excavation methods.

Design development and operation of a hardrock roadheader

Saunders, T W Bromley, J C Proc 6th Australian Tunnelling Conference, Melbourne, March 1987V1, P239–246. Publ Parkville: AusIMM, 1987

Experience in Construction in Strong Rock with Roadheader

Experience in Construction in Strong Rock with Roadheader in the ArizBasauri section of Rock drillability can be considered to be highly determined by two of its mechanical aspects, it was essential to perform the works with mechanical excavation. The short length of the sections with constant section and the need to excavate the

Master in Tunnelling and TBMs Politecnico di Torino

Juha Kukkonen dedied a complete day to Rock Drilling machines and tools produced for tunnelling and mining appliions. Jumbos for D&B excavation, Bolting units and Extension Drilling equipments were treated in detail, analysing the control systems of the machine that ensure the best possible results in terms of production and final product.

Hard rock tunnel boring, cutting, drilling and blasting

Hard rock tunnel boring, cutting, drilling and blasting: rock parameters for excavatability Thuro, K. Plinninger, R.J. ETH Swiss Federal Institute of Technology Zurich, Switzerland Dipl g. Bernd Ge Ingenieur , Munich, Germany ABSTRACT: Determining tunnel stability is a key issue during preliminary site investigation.

SELECTION OF CONSTRUCTION METHODS IN ROCK TUNNELING

SELECTION OF CONSTRUCTION METHODS IN ROCK TUNNELING Dipl. Ing. Josef Daller iC consulenten ZT Vienna, Austria (drill&blast or mechanical excavation), means of rock support, face support and required auxiliary measures. Excavation sequences, enlargement of excavation profiles for allowing displacement of the 2.6 ENVIRONMENTAL ASPECTS

Drilling, Blasting and Cutting – Is it Possible to

ing or cutting rate (excavation performance) and the tool wear of a drilling rig, roadheader or TBM (wear or usage criterion). The interaction of the main factors involved is illustrated in Figure 1. These terms are used in underground as well as in surface construction. In this paper, only the aspects relating to tunnelling are discussed. 1.

Downloads Austrian Society for Geomechanics

The rock cutting process of road headers – overview of laboratory tests and numerical simulation Gerhard Pittino, Robert Galler, Markus MiklResch, Richard Tichy, Werner Ecker, Thomas Antretter, Martin Gimpel, Hubert Kargl Download presentation in PDF format Rock Mechanical Aspects of Roadheader Excavation Uwe Restner, Ralf J. Plinninger

Advanced Rock Tunnelling Engineering Solutions WSP

A roadheader is used as a mechanized method of cutting that has more precise cutting, less vibration, and no overbreak. Recent developments allowed the excavation of rock tunnels in very hard rock. The basic cutting tool is a very large milling head mounted on

A Fuzzy AHP Approach to Select the Proper Roadheader in

deals with geotechnical properties of rock formation to be excavated, machine performance, machine size and flexibility, machine price and total costs (Rostami et al, 1994). Moreover, main aspects influencing on the roadheader type selection include physical and mechanical characteristics, economic, technical and pro