cutting rate of roadheader

Roadheader – A comprehensive review - ScienceDirect

Jan 01, 2020  Keles (2005) determined the instantaneous cutting rate (ICR) of the boom type, medium weight milling type roadheader (MK-2B) by regression analysis to correlate ICR and rock properties and established that ICR is having highest correlation with lab cutting specific energy i.e. (R 2 = 0.8411).

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ROADHEADER IN TUNNELING

PARAMETER FOR ROADHEADER CUTTABILITY HOW TO ASSESS SPC. 16 0,001 0,010 0,100 1,000 10,000 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 ... Net Cutting Rate (NCR) and Specific Pick Consumption (SPC) ROADHEADER IN TUNNELING. S. TATION EXCAVATION, EAST SIDE ACCESS . 38 .

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New model for predicting Instantaneous Cutting Rate of ...

Feb 29, 2016  Roadheaders are mechanical excavators which have been extensively used in tunneling, mining and civil engineering works. Performance prediction of the roadheader is major factor in determining the economy of an underground excavation project. In this study, a new model for predicting the Instantaneous Cutting Rate (ICR) has been developed. The performance of EBZ260W axialtype roadheader

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Prediction of roadheaders' performance using artificial ...

Oct 01, 2015  Performance prediction is an important issue for successful roadheader application and generally deals with machine selection, production rate and bit consumption. The main aim of this research is to investigate the cutting performance (instantaneous cutting rates (ICRs)) of medium-duty roadheaders by using artificial neural network (ANN) approach.

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Cutting Performance of Jack Hammers and Roadheaders in ...

The Variation of Instantaneous Cutting Rate of Roadheader Eickhoff ET 250 with Tunnel Chainage in Taksim Platform Tunnel 1 Figure 4. The Variation of Instantaneous Cutting Rate of Jack Hammer with Tunnel Chainage in Levent Line 2 . Waiting 8% Shotcrete 31%

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ROADHEADER PERFORMANCE PREDICTION

actual cutting rates per hour or per shift will only be a small and variable fraction of any calculated instantaneous cutting rates. Laboratory cuttability tests are a useful short-cut, in using a small-scale simulation of the action of a real cutting tool as mounted on a roadheader.

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CUTTING PERFORMANCE ASSESSMENT OF A MEDIUM

In this thesis, in-situ instantaneous cutting rates of boom type, medium-weight milling type roadheaders (Mk-2B) at Çayırhan Coal Mine are determined by ... Keywords: medium-weight roadheader, performance prediction, cutting specific energy, instantaneous cutting rate v. ÖZ

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Rock Mechanical Aspects of Roadheader Excavation

Empirical data on the effect of RMCR on effective net cutting rate Experience has shown, that cutting speed has a signifi-cant influence on the activa-tability of pre-existing discontinuities. For application in jointed rock mass, the use of low cutting speeds (≈ 1.4 m/s)

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CUTTING PERFORMANCE ASSESSMENT OF A MEDIUM

In this thesis, in-situ instantaneous cutting rates of boom type, medium-weight milling type roadheaders (Mk-2B) at Çayırhan Coal Mine are determined by ... Keywords: medium-weight roadheader, performance prediction, cutting specific energy, instantaneous cutting rate v. ÖZ

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Cutting Performance of Jack Hammers and Roadheaders in ...

The Variation of Instantaneous Cutting Rate of Roadheader Eickhoff ET 250 with Tunnel Chainage in Taksim Platform Tunnel 1 Figure 4. The Variation of Instantaneous Cutting Rate of Jack Hammer with Tunnel Chainage in Levent Line 2 . Waiting 8% Shotcrete 31%

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ROADHEADER PERFORMANCE PREDICTION

actual cutting rates per hour or per shift will only be a small and variable fraction of any calculated instantaneous cutting rates. Laboratory cuttability tests are a useful short-cut, in using a small-scale simulation of the action of a real cutting tool as mounted on a roadheader.

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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

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Performance prediction of roadheaders using ensemble ...

A critical issue in successful roadheader application is the ability to evaluate and predict the machine performance named instantaneous (net) cutting rate. Although there are several prediction methods in the literature, for the prediction of roadheader performance, only a few of them have been developed via artificial neural network techniques.

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Research Article Study on Roadheader Cutting Load at ...

uence on cutting head instantaneous cutting rate and the cutting specic energy consumption. Bilgin et al. [ ] studied some geological and geotechnical factors a ecting the performance of a roadheader in an inclined tunnel. However, the domestic researchers have

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Rock Mechanical Aspects of Roadheader Excavation

Empirical data on the effect of RMCR on effective net cutting rate Experience has shown, that cutting speed has a signifi-cant influence on the activa-tability of pre-existing discontinuities. For application in jointed rock mass, the use of low cutting speeds (≈ 1.4 m/s)

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Study on Roadheader Cutting Load at Different Properties ...

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 process.

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Hard Rock Cutting with Roadheaders the Icutroc Approach

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 75 %. Since that time, Roadheaders of the ICUTROC-generation have excavated motorway tunnels in Italy and

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Sonnenburg Tunnel: Roadheader Drive under tricky ...

Cutting rate diagram for the roadheader with the characteristic values for the various types of rock applied in the ­feasibility study [2] (Foto: Plinninger) Roadheader excavation in quartz phyllite. The cutting lines of each bit are clearly discernible at the face on account of the low segmentation of the rock

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(PDF) Evaluation of Conventional Drill and Blast and Using ...

Cutting capacity provides for how effective the Roadheader is. The higher the cutting rate the lower the excavation costs. d. Stability statesStability is achieved with the use of horizontal and vertical hydraulic cylinders and is affected by the width of the tunnel excavated and if the roadheader works under wet and soft ground. e. Maximum ...

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Geotechnical Risk Assessment and Selection of Suitable ...

Then by using an instantaneous cutting rate model, the cutter head power of the roadheader was determined. According to the model, a lightweight roadheader with a cutter head power of about 80-110 KW and 40 t weight are suitable. Finally, four types of manufactured roadheader with similar specifications were selected. INTRODUCTION

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New model for predicting Instantaneous Cutting Rate of ...

The instantaneous cutting rates of a selected roadheader were calculated using specific energy (SE) values and compared to the previous models. The amount of cutter consumption was also calculated ...

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Roadheader solutions in focus - TunnelTalk

Currently the DHMS roadheader family consists of three weight classes ranging from 61 tonne to 130 tonne, and cutting boom power that ranges from 200 kW to 400 kW. The new, DHMS compact design roadheaders of the lower and middle weight class have been adapted specially to the challenges posed in coal mines and as applied to civil projects.

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Cutting Performance of Jack Hammers and Roadheaders in ...

The Variation of Instantaneous Cutting Rate of Roadheader Eickhoff ET 250 with Tunnel Chainage in Taksim Platform Tunnel 1 Figure 4. The Variation of Instantaneous Cutting Rate of Jack Hammer with Tunnel Chainage in Levent Line 2 . Waiting 8% Shotcrete 31%

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Rock Mechanical Aspects of Roadheader Excavation

Empirical data on the effect of RMCR on effective net cutting rate Experience has shown, that cutting speed has a signifi-cant influence on the activa-tability of pre-existing discontinuities. For application in jointed rock mass, the use of low cutting speeds (≈ 1.4 m/s)

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Research Article Study on Roadheader Cutting Load at ...

uence on cutting head instantaneous cutting rate and the cutting specic energy consumption. Bilgin et al. [ ] studied some geological and geotechnical factors a ecting the performance of a roadheader in an inclined tunnel. However, the domestic researchers have

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Study on Roadheader Cutting Load at Different Properties ...

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 process.

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Roadheader Excavation Performance - Geological And ...

Excavation performance is a' term used in underground construction to describe the influence of a number of parameters on the cutting rate and the tool wear of a roadheader. The interaction of the main factors is illustrated in Figure 1. (Figure in full paper)

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Hard Rock Cutting with Roadheaders the Icutroc Approach

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 75 %. Since that time, Roadheaders of the ICUTROC-generation have excavated motorway tunnels in Italy and

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A State Monitoring Method of Roadheader Cutting Arm

mining engineering, and roadheader has become the core equipment of comprehensive mechanized coal mining in the major coal mines. Because of the high ambient temperature and greater humidity in the coal mine, the failure rate of roadheader is higher, and it also increased the difficulty of roadheader

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Geotechnical Risk Assessment and Selection of Suitable ...

Then by using an instantaneous cutting rate model, the cutter head power of the roadheader was determined. According to the model, a lightweight roadheader with a cutter head power of about 80-110 KW and 40 t weight are suitable. Finally, four types of manufactured roadheader with similar specifications were selected. INTRODUCTION

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Sonnenburg Tunnel: Roadheader Drive under tricky ...

Cutting rate diagram for the roadheader with the characteristic values for the various types of rock applied in the ­feasibility study [2] (Foto: Plinninger) Roadheader excavation in quartz phyllite. The cutting lines of each bit are clearly discernible at the face on account of the low segmentation of the rock

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Roadheader solutions in focus - TunnelTalk

Currently the DHMS roadheader family consists of three weight classes ranging from 61 tonne to 130 tonne, and cutting boom power that ranges from 200 kW to 400 kW. The new, DHMS compact design roadheaders of the lower and middle weight class have been adapted specially to the challenges posed in coal mines and as applied to civil projects.

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(PDF) Prediction of Wear of Roadheader Picks Using ...

As it can be seen in Fig. 10c the mean cutting force from the numerical analysis agrees quite well with the average experimental force (about 7,000 kN). Simulation of rock cutting with wear evaluationSimulation of rock cutting with one pick of a roadheader has been analysed using a model shown in Figure 11a.

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Performance Analysis of a Hybrid Power Cutting System for ...

ResearchArticle Performance Analysis of a Hybrid Power Cutting System for Roadheader YangYang,GuoweiLi,andAihuiYuan StateKeyLaboratoryofMechanicalTransmission ...

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BREAKTHROUGHS IN TUNNELING 2019 DRILL BLAST

cutting rate. The effective netcutting timeis definedby the timethe cutter headis in contactwiththerock and actuallycutting.Thus, supplementary actions of the cutter headlikeprofiling andloading or any idling time during cutting operation does not contribute to the effectivenet cutting time.

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Comparative studies on the performance of a roadheader ...

The results of this study show that machine utilization time is 28.2%for roadheader and 14.2% for impact hammers. Average net cutting rates (NCR) are 32.26 m3/h for roadheader (218.3 m3/day), net breaking rate (NBR) 13.1 m3/h (45 m3/day) for impact hammers and production rate with drill and blast method (DB) is found to be 187 m3/day.

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