hard rock roadheader process

hard rock roadheader process

(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

Read More
Roadheader – A comprehensive review - ScienceDirect

2020-1-1 · Kotwica et al. (2010) developed a cutter head trajectory for hard rock mining that underwent a field test on the KR150 roadheader and is an adaptable modernisation of the cutter head. Kotwica (2011) evaluated the problem encountered with the tangential rotary pick of the boom and presented a solution to counter the rapid wearing of the picks ...

Read More
Predictive models for roadheaders' cutting performance in ...

The study can provide essential and valuable references to the new design of high performance electric control box isolator for high-power Hard Rock

Read More
Numerical simulation of rock fragmentation process by ...

2013-12-31 · A numerical model of rock fragmentation caused by a roadheader pick was established based on the particle flow code in two dimensions to study

Read More
Roadheader solutions in focus - tunneltalk

2017-5-1 · 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

Read More
Application of SPH in Numerical Simulation of Roadheader ...

The yaw rock-breaking processes of roadheader single pick at different positions have been simulated by using LS-DYNA, and the dynamic process that pick-shaped cutters cut hard-rock has been analyzed with the technique of SPH(Smooth Particle Hydrodynamics). It has been found that separating rock into smooth particle hydrodynamics(SPH) units can effectively simulate

Read More
Stability Analysis of Roadheaders - Avestia

2021-5-19 · One of the new technology to improving the efficiency of cutting ability of roadheader is mini-disc cutters. Disc cutters are becoming a standard cutting tool in hard rock formation. However standard disc cutters were too big for mounting on cutting head that is less than 2 meters diameter and their thrust levels are much higher than roadheaders

Read More
Prediction of roadheaders' performance using artificial ...

2015-10-1 · The evolution of rock (or coal) breakage process. Fig. 4, Fig. 5 show the picture of roadheader employed and a view of rock formations in the tunnel, respectively. ... Performance prediction: a key issue in mechanical hard rock mining.

Read More
Investigating the simulated control of the rotational ...

2015-12-5 · The main responsibilities carried out by roadheaders are cutting rock heading faces of drilled headings or tunnels. This process, especially when drilling headings in hard rock, has been characterized to date by high energy consumption. It is a highly complex process due to its physical nature, as well as, a variety of other factors which it is impacted by. This article

Read More
A Roadheader-Assisted Coal Cutter Based on Tensile

This paper proposes a new roadheader-assisted coal cutter (RACC) based on the tensile failure mechanism of coal. An innovative mining method, called the cutting inside and spalling outside mining (CISOM) method, is developed based on this new RACC. The mechanical model is established, and the working mechanism of the new CISOM method is illustrated using a

Read More
Numerical Studies of the Dynamics of the Roadheader ...

2021-11-4 · The process of cutting rocks with a boom-type roadheader results in extreme dynamic loads and vibrations. Mining, especially in the case of hard rocks, is associated with large energy consumption, which, when combined with low process efficiency, can lead to low drilling performance. These phenomena are undesirable because excessive dynamic load leads to

Read More
Application of SPH in Numerical Simulation of Roadheader ...

The yaw rock-breaking processes of roadheader single pick at different positions have been simulated by using LS-DYNA, and the dynamic process that pick-shaped cutters cut hard-rock has been analyzed with the technique of SPH(Smooth Particle Hydrodynamics). It has been found that separating rock into smooth particle hydrodynamics(SPH) units can effectively simulate

Read More
(PDF) PRODUCTION ESTIMATING TECHNIQUES FOR

Academia.edu is a platform for academics to share research papers.

Read More
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

Read More
Stability Analysis of Roadheaders - Avestia

2021-5-19 · One of the new technology to improving the efficiency of cutting ability of roadheader is mini-disc cutters. Disc cutters are becoming a standard cutting tool in hard rock formation. However standard disc cutters were too big for mounting on cutting head that is less than 2 meters diameter and their thrust levels are much higher than roadheaders

Read More
Analysis of Roadheader for Breaking Rock Containing

This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process.

Read More
The Importance of Research on Alternative and Hybrid

2017-8-26 · process [1]) there is a trend to search for continuous rock extraction methods like mechanical cutting. ... is the major limiting factor for roadheader use in hard rock [2]–seeFig.2. But also the geometric configuration and the machine weight are of important influence [3] as shown in Fig. 3. ...

Read More
A Roadheader-Assisted Coal Cutter Based on Tensile

This paper proposes a new roadheader-assisted coal cutter (RACC) based on the tensile failure mechanism of coal. An innovative mining method, called the cutting inside and spalling outside mining (CISOM) method, is developed based on this new RACC. The mechanical model is established, and the working mechanism of the new CISOM method is illustrated using a

Read More
深部硬岩截割特性与机械化破岩试验研究

2021-9-15 · roadheader, which is based on the multi-pick rotating cutting, has the highest mining efficiency and stability, and the continuous mining process has the average work efficiency of 107.7 t/h. Key words: high geostress; rock cuttability; excavation damage zone

Read More
陆新晓-应急管理与安全工程学院 - cumtb.edu.cn

2019-5-5 · (2)Lu Xinxiao, Wang Deming, Xu Chaohang, et al. Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling [J]. Tunnelling and Underground Space Technology, 2015, 49: 1-8.

Read More
Numerical Studies of the Dynamics of the Roadheader ...

2021-11-4 · The process of cutting rocks with a boom-type roadheader results in extreme dynamic loads and vibrations. Mining, especially in the case of hard rocks, is associated with large energy consumption, which, when combined with low process efficiency, can lead to low drilling performance. These phenomena are undesirable because excessive dynamic load leads to

Read More
Application of SPH in Numerical Simulation of Roadheader ...

The yaw rock-breaking processes of roadheader single pick at different positions have been simulated by using LS-DYNA, and the dynamic process that pick-shaped cutters cut hard-rock has been analyzed with the technique of SPH(Smooth Particle Hydrodynamics). It has been found that separating rock into smooth particle hydrodynamics(SPH) units can effectively simulate

Read More
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

Read More
1090. Numerical simulation of rock fragmentation

2020-6-2 · roadheader pick in the rock fragmentation process and compared the simulation results with experimental results [7]. Yu et al. used the explicit dynamic program LS-DYNA to simulate the rock fragmentation process with a rotary roadheader pick and pointed out that shear failure plays a dominant role in the rock failure [8].

Read More
Stability Analysis of Roadheaders - Avestia

2021-5-19 · One of the new technology to improving the efficiency of cutting ability of roadheader is mini-disc cutters. Disc cutters are becoming a standard cutting tool in hard rock formation. However standard disc cutters were too big for mounting on cutting head that is less than 2 meters diameter and their thrust levels are much higher than roadheaders

Read More
Analysis of Roadheader for Breaking Rock Containing

This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process.

Read More
The Importance of Research on Alternative and Hybrid

2017-8-26 · process [1]) there is a trend to search for continuous rock extraction methods like mechanical cutting. ... is the major limiting factor for roadheader use in hard rock [2]–seeFig.2. But also the geometric configuration and the machine weight are of important influence [3] as shown in Fig. 3. ...

Read More
Suitability of Brisbane Rock Conditions to Roadheader ...

2020-1-12 · Suitability of Brisbane Rock Conditions to Roadheader Excavation by Jody Herley Roadheader excavation has typically been limited in its ability to cut hard rock. Despite this, a number of tunnelling projects being implemented in South-East Queensland are utilising roadheaders to excavate sections of the tunnel which pass through the

Read More
陆新晓-应急管理与安全工程学院 - cumtb.edu.cn

2019-5-5 · (2)Lu Xinxiao, Wang Deming, Xu Chaohang, et al. Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling [J]. Tunnelling and Underground Space Technology, 2015, 49: 1-8.

Read More
中国科学与技术进展_百度百科

中国科学与技术进展内容简介. 编辑. 语音. This monograph(the Proceedings of the China Association for Science and Technology,V01.6)collects 24 selected Paners presented at the 11th Annual Conference of China Association forScience and Technology,Chongqing,September 7-10,2009,and 57 selected papers published

Read More