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ROADHEADER IN TUNNELING

PRINCIPLES OF ROCK MASS INFLUENCE. 19 Strength . Conditions . Orientation . 0.5 m . 0.3 m. 0.3 m . Block size . PARAMETER FOR ROADHEADER CUTTABILITY HOW ROCK MASS IMPACT ROADHEADER CUTTABILITY. 22 Rock mass favorable for cutting can make an uneconomical or critical operation economical!!!

Roadheaders for mining TON Mining and Rock Technology

The powerful transversal cutter head of this roadheader is able to cut rock up to a compressive strength of up to 80 MPa (UCS). MR341 Roadheader for mining TON MR341 roadheader is a part-face cutting machine designed for roadway development in coal mining.

The performance of a roadheader in high strength rock

The performance of a roadheader in high strength rock formations in Küçüksu tunnel N. Bilgin, D. Tumac & C. Feridunoglu Istanbul Technical University, Mining Engineering Department, Istanbul, Turkey A.R. Karakas & M. Akgul STFA Co, Istanbul, Turkey ABSTRACT: The main objective of this study was to investigate the performance of a roadheader

(PDF) Rock Mechanical Aspects of Roadheader Excavation

The lifetime of the present pick tools in higher rock strength and abrasivity is the major limiting factor for roadheader use in hard rock [2] see Fig. 2. But also the geometric configuration

Roadheaders Tunneling For Most Rock Formations TON

TON MT520 roadheader, originally designed for cutting large cross sections in tunneling, is as efficient for use in production of soft industrial minerals like salt, potash and chalk. Its modular design offers more flexibility than standard roadheaders and works in most rock conditions up to 100 MPa compressive strength.

Mitsui S300M Roadheader Low Profile

Mitsui S300M Roadheader Rock Strength Cutting Rating 130 mpa . MTC Mine + Tunnel Constructions . Title: Mitsui S300M Roadheader Low Profile Author: Glenn Bartho Created Date: 8/16/2013 2:14:46 PM

ROADHEADERS PERFORMANCE OPTIMIZATION

The roadheader production rate and bit costs are controlled by several parameters including: Rock parameters, such as rock compressive and tensile strength, percent of hard and abrasive mineral content (i.e. quartz), rock fabric and matrix type and hardness, existence of oriented

Roadheader Rock Grinders, Concre

Roadheader Model Weight Class Total Power (kW) Cutter Transmission Power (kW) AQM 50: 18 tons: 78.5 163: 33/110: AQM 100L: 24 tons: 135 186: 110: AQM 100: 27 tons

Hard Rock Cutting with Roadheaders the Icutroc Approach

practical oriented back ground for setting the demands to be covered by a "hard rock"-Roadheader. The individual steps covered the development of new pick qualities, new pick Cutting porphyroide with a compressive strength ranging between 90 and 200 MPa, the pick consumption could be lowered by 75 % and the cutting rate increased by 25 to

Roadheaders Alpine Roadheading Products Bellefonte PA

Alpine Sales & Rental Corp. 801 Pleasant View BLVD, Bellefonte, PA. 16823 USA. PHONE: +1-814-355-0040 FAX: +1-814-355-0046 EMAIL: [email protected]

Roadheader Rock Grinders, Concre

Roadheader Model Weight Class Total Power (kW) Cutter Transmission Power (kW) AQM 50: 18 tons: 78.5 163: 33/110: AQM 100L: 24 tons: 135 186: 110: AQM 100: 27 tons

ROADHEADER PERFORMANCE PREDICTION Bamford

• Gehring calculates roadheader production from the laboratory test values, using a series of numerical ratings which vary to a roadheader's weight and installed power • Bilgin uses actual machine weight and cutterhead power in his equations for calculating roadheader production from the rock strength

Stability Analysis of Roadheaders

cutting power the transverse type roadheaders can cut higher strength rock than the longitudinal type roadheaders considering to stability [4-6,8]. Since the longitudinal head type roadheader can cut vertically as well, the vertical stability should also be considered in the comparison of the stability of roadheaders [3,7]. All previous studies are

A model to predict the performance of roadheaders based on

a given power of roadheader, the excavation rate in m³/cutting hour might be predicted using specific energy values given as in the following equation14–15: [1] where SEis the specific energy, σcis the rock compressive strength and Eis the rock elastic modulus. Widely accepted rock classification and assessment for the performance

Performance of roadheaders in low strength pyroclastic

Jul 01, 2019 Bilgin et al. (2005a) analyzed the performance of a shielded roadheader with 90 kW cutterhead power in a tunnel project, and reported that the roadheader with the low ICR that was obtained could be used in high strength rock formations. Roadheader performance was compared with impact hammer and drilling blasting methods for another tunnel

Hard Rock Cutting with Roadheaders the Icutroc Approach

practical oriented back ground for setting the demands to be covered by a "hard rock"-Roadheader. The individual steps covered the development of new pick qualities, new pick Cutting porphyroide with a compressive strength ranging between 90 and 200 MPa, the pick consumption could be lowered by 75 % and the cutting rate increased by 25 to

Geological limits in roadheader excavation Four case studies

now basic rock drilling processes and bit wear have been studied in drill and blast tunnelling (Thuro 1996, Thuro 1997 a, b). While performance is mainly influenced by macroscopic qualities such as rock strength, toughness (deformability), anisotropy, jointing or the weathering stage of rock

Predictive Models for Roadheaders’ Cutting Performance in

rock classification system to explain changes in roadheader’s advance rates at San Manuel Copper Mine in an inclined drift at an 11% grade (Bilgin et al., 2004). Gehring (1989) stud-ied the relationship between ICR and rock uniaxial compressive strength (UCS) for a mill-ing type roadheader

Roadheaders for Different Rock Formations

The size of a roadheader with a 300 kilowatt installed cutting power was designed for boring and cutting through medium to hard rock of 120 megapascals (MPa.) to 150 Mpa. compressive strength. The machine can excavate tunnels reaching 7.69 m. in height and 8.96 m. in width from one central position.

(PDF) Prediction of Wear of Roadheader Picks Using

The paper presents prediction of wear of roadheader picks using numerical simulations. Estimation of wear has been included into the numerical model of rock cutting based on the discrete element method. The amount of wear is calculated using the

(PDF) Evaluation of Conventional Drill and Blast and Using

At rock strength lesser than the sandstone higher advances can be achieved. Cutting CycleCutting -Loading -SupportThe cutting cycle involves cutting of the rock using the roadheader, loading of broken rock and support on the roof and sidewall. Assume a normal shift time worked is

Roadheader solutions in focus TunnelTalk

The Herrenknecht shaft boring roadheader (SBR) was developed specifically for mechanized sinking of blind shafts in soft to medium-hard rock. The SBR has been equipped with a roadheader boom and a rotating cutting drum that enables the cutting of variable shaft diameters from 8m to 12m.

A new model to predict roadheader performance using rock

Feb 08, 2013 Prediction of roadheader performance plays a significant role in the plan of tunnel construction, which is influenced by different key parameters, including rock strength, discontinuity in rock mass, type and specifications of roadheader machine, and brittleness. The main aim of this study is to build a robust empirical equation based on rock mass properties for the roadheader performance

CUTTING PERFORMANCE ASSESSMENT OF A MEDIUM

strength, Cone Indenter hardness, Shore hardness, Schmidt hammer rebound hardness and laboratory cutting specific energies are determined by laboratory tests for the rock and coal types encountered in the drivage of roadways. The relations between the instantaneous cutting rates and the above rock characteristics and the

Stability Analysis of Roadheaders

cutting power the transverse type roadheaders can cut higher strength rock than the longitudinal type roadheaders considering to stability [4-6,8]. Since the longitudinal head type roadheader can cut vertically as well, the vertical stability should also be considered in the comparison of the stability of roadheaders [3,7]. All previous studies are

BREAKTHROUGHS IN TUNNELING 2019 DRILL & BLAST

STRENGTH EVALUATED AND DEFINED BY RMCR 26 Rock Mass Cuttability Rating (RMCR) Reduction of Rock Mass Strength (UCS RM) related to Rock Strength (UCS R) for TON Roadheaders using Low Cutting Speed (~1.4 m/s) 0 50 100 150 200 250 300 0 50 100 150 200 250 300 UCS R [MPa] UCS RM [MPa] RMCR=10 RMCR=15 RMCR=20 RMCR=25 RMCR=30 RMCR=35

A model to predict the performance of roadheaders based on

a given power of roadheader, the excavation rate in m³/cutting hour might be predicted using specific energy values given as in the following equation14–15: [1] where SEis the specific energy, σcis the rock compressive strength and Eis the rock elastic modulus. Widely accepted rock classification and assessment for the performance

Predictive Models for Roadheaders’ Cutting Performance in

rock classification system to explain changes in roadheader’s advance rates at San Manuel Copper Mine in an inclined drift at an 11% grade (Bilgin et al., 2004). Gehring (1989) stud-ied the relationship between ICR and rock uniaxial compressive strength (UCS) for a mill-ing type roadheader

Geological limits in roadheader excavation Four case studies

now basic rock drilling processes and bit wear have been studied in drill and blast tunnelling (Thuro 1996, Thuro 1997 a, b). While performance is mainly influenced by macroscopic qualities such as rock strength, toughness (deformability), anisotropy, jointing or the weathering stage of rock

CUTTING PERFORMANCE ASSESSMENT OF A MEDIUM

strength, Cone Indenter hardness, Shore hardness, Schmidt hammer rebound hardness and laboratory cutting specific energies are determined by laboratory tests for the rock and coal types encountered in the drivage of roadways. The relations between the instantaneous cutting rates and the above rock characteristics and the

roadheaders for soft rock

2009-1-8• The peak stress is the strength of the rock. It may fail catastrophically if the load frame is "soft". Example below is for a "stiff" frame. • The compressive strength of rock is a function of the confining pressure. • As the confining pressure increases so does the strength. Goodman, Intro to Rock Mechanics. Get price

Roadheader Type AM 50

The ALPINE MINER AM 50 is a boom-type roadheader designed to cut medium-hard rock with an unconfined compressive strength of up to 90 MPa (800 kp/cm 2). The machine can, however, also take thin seams of harder materials in its stride should these be encountered in a working face. This means that the AM 50 can cut most rock with economic efficiency.

Study on Roadheader Cutting Load at Different Properties

Nov 04, 2013 The mechanism of cutting process of roadheader with cutting head was researched, and the influences of properties of coal and rock on cutting load were deeply analyzed. Aimed at the defects of traditional calculation method of cutting load on fully expressing the complex cutting process of cutting head, the method of finite element simulation was proposed to simulate the dynamic cutting

Some geological and geotechnical factors affecting the

showed that for a given power of roadheader, excava-tion rate in solid bank m3/cutting hour might be pre-dicted using specific energy values given as in the following equation, SE ¼ r2 c 2E; ð1Þ where SE is the specific energy, r c is the rock compres-sive strength and E is the rock elastic modulus. Widely accepted rock classification and

Geotechnical Risk Assessment and Selection of Suitable

and they are able to excavate rock formations with compressive strength of 20-140 MPa. Machines’ specifications are listed in Table 1. Figure 1 is also a useful guide to select a roadheader based on rock strength, tunnel cross section, required weight and power of the machine. Table 1: Classification of Roadheader (Ratan Raj Tatiya 2013

1669. Numerical investigation on rock fragmentation by

The roadheader, a key item of equipment for underground excavation, is widely used in rock fragmentation. The cutting head is the cutting mechanism of a roadheader, and its capacity directly rock compressive strength, tensile strength, dynamic and static modulus of elasticity, and brittle index have been published [3-6]. Tiryaki et al. [7

Suitability of Brisbane Rock Conditions to Roadheader

to predict roadheader performance, most of the relationships utilising the UCS also take into account other rock properties or machine specifications. These models are discussed briefly below. Nelson, Sinha and Handewith’s Model Nelson, Sinha and Handewith (1991), developed a plot of rock strength (UCS) versus mining rate for

STR200H STR200H Coal/Rock Seam Roadheader Roadheader

SANY STR200H STR200H Coal/Rock Seam Roadheader for Sale, High Efficiency & Low Consumption Roadheader, SANY Mining & Tunneling Price. 24h Star Service, Get an Immediate Quote.