excavation of high stressed hard rock with roadheader

  • Rock Tunnelling 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

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  • Geotechnical Risk Assessment and Selection of Suitable

    the 1960s, use of roadheader for mechanized tunneling began and by the end the 1970s, it gained considerable acceptance worldwide. In the past decade, the development of roadheader in tunneling has reached a cutting level not only in soft rock but also in medium to hard rock.

    Get price
  • (PDF) Roadheader appliions in mining and tunneling

    Roadheaders offer a unique capability and flexibility for the excavation of soft to medium strength rock formations, therefore, are widely used in underground mining and tunneling operations. A critical issue in successful roadheader appliion is

    Get price
  • Rock Tunneling WSP

    The Chinatown station of San Francisco''s Central Subway is being constructed in poor rock conditions using the NATM method. Roadheaders. A roadheader is used as a mechanized method of cutting that has more precise cutting, less vibration and no overbreak. Recent developments have allowed the excavation of rock tunnels in very hard rock.

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  • The performance of a roadheader in high strength rock

    Detailed statistical analysis showed that net advance rate of the roadheader is directly influenced by rock compressive strength, rock mass quality designation and water income. In the second stage of the research study, a big rock block taken from the tunnel face was subjected to full

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  • (PDF) Roadheader appliions in mining and tunneling

    Roadheaders offer a unique capability and flexibility for the excavation of soft to medium strength rock formations, therefore, are widely used in underground mining and tunneling operations. A critical issue in successful roadheader appliion is

    Get price
  • Roadheader solutions in focus TunnelTalk.com

    The Herrenknecht shaft boring roadheader (SBR) was developed specifically for mechanized sinking of blind shafts in soft to mediumhard 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.

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  • RoadHeaders Hardrock Heavy Duty Miners —

    MH620 hardrock miner is an electrically powered and crawlermounted roadheader that is engineered to excavate roadways and galleries. This heavyduty machine has a powerful transverse cutter head mounted on an extremely robust telescopic boom. It is designed to excavate rock with high compressive strengths.

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  • Hard rock tunnel boring, cutting, drilling and blasting

    Thuro, K., Plinninger, R.J., Hard rock tunnel boring, cutting, drilling and blasting: rock parameters for excavatability 1228 ISRM 2003 – TECHNOLOGY ROADMAP FOR ROCK MECHANICS In the first interaction, the excavation performance is influenced by the machine parameters of the chosen tunnelling rig: the installed power, the type of drilling rig or

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  • MH620 Electrically Powered HardRock Miner

    MH620 hardrock miner is an electrically powered and crawlermounted roadheader that is engineered to excavate roadways and galleries. This heavyduty machine has a powerful transverse cutter head mounted on an extremely robust telescopic boom. It is designed to excavate rock with high compressive strengths.

    Get price
  • Geological limits in roadheader excavation Four case studies

    prior to tunnelling projects. During the last few years in mechanical excavation, problems have occured also connected with the accurate prediction of excavation rates in soft and hard rock. Every now and again problems have been encountered leading to high

    Get price
  • (PDF) Roadheader appliions in mining and tunneling

    Roadheaders offer a unique capability and flexibility for the excavation of soft to medium strength rock formations, therefore, are widely used in underground mining and tunneling operations. A critical issue in successful roadheader appliion is

    Get price
  • TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND

    TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND FUTURE CHALLENGES ZHAO Jian (hard rock) tunnels. Seikan tunnel (197288), 54 km long with undersea length of 23 km. Gjovik cavern (19911993), largest rock cavern of 61 used for rock excavation. 7 Rock Excavation: DrillandBlast

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  • Excavation of HighStressed Hard Rock with Roadheader

    Drill and blast method becomes unfavorable for deep mining of hard rock. Mechanical excavation with roadheader EBZ160TY was trialed at work face with hard rock and high ground stress.

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  • Shaft Boring Roadheader (SBR) – Herrenknecht AG

    The Shaft Boring Roadheader (SBR) was developed for the mechanized sinking of blind shafts in soft to mediumhard rock. Unlike the Shaft Boring Machine (SBM) with a hard rock cutting wheel installed, the SBR has been equipped with a roadheader boom and a rotating cutting drum.

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  • Shaft Boring Roadheader (SBR) – Herrenknecht AG

    The Shaft Boring Roadheader (SBR) was developed for the mechanized sinking of blind shafts in soft to mediumhard rock. Unlike the Shaft Boring Machine (SBM) with a hard rock cutting wheel installed, the SBR has been equipped with a roadheader boom and a rotating cutting drum.

    Get price
  • Papers by Keyword: High Stress scientific.net

    High stress was found to play positive role in improving its working ability. Under the gentle disturbance of roadheader excavation, the high ground stress brings the surrounding rock mass to deform into yield and lets the stress/strain energy transform into fracture energy of rock fragmentation.

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  • Making hardrock history Mining Corp.

    Making hardrock history The newest concept in mining? Think again. Hardrock cutting has a long and winding past, stress, enabling the excavation of hard rock using a small, compact machine. instance puts high requirements on the design of the face

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  • Hard rock tunnel boring, cutting, drilling and blasting

    Thuro, K., Plinninger, R.J., Hard rock tunnel boring, cutting, drilling and blasting: rock parameters for excavatability 1228 ISRM 2003 – TECHNOLOGY ROADMAP FOR ROCK MECHANICS In the first interaction, the excavation performance is influenced by the machine parameters of the chosen tunnelling rig: the installed power, the type of drilling rig or

    Get price
  • Roadheader excavation performance

    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. Every now and again problems have been encountered leading to high

    Get price
  • Experimental investigation of hard rock fragmentation

    For deep hard rock, high stress and excavationinduced stress redistribution are the unignorable conditions that influence the rock cuttability. Therefore, a variety of rock fragmentation tests were performed to understand the hard rock cuttablities under the different confining stress conditions.

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  • Rock Mechanical Aspects of Roadheader Excavation

    Rock Mechanical Aspects of Roadheader Excavation Minimizing Risks in RH Appliion • In order to minimize operational ri sks for r oadheader appliion, it is mandatory to perform high quality site investigation which takes into account not only the stability of the rock mass but also puts a focus on the specific rock excavatability.

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  • Stability analysis of roadheaders with minidisc

    Stability analysis of roadheaders with minidisc. Author links open overlay panel O. Acaroglu C. Erdogan. Show more. Due to disc cutters being the standard tool for hard rock excavation, this study shows that stability analysis of roadheaders should be considered for evaluating roadheader and cutting head efficiency. The stability

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  • Comparative studies on the performance of a roadheader

    Mechanical excavation with roadheader EBZ160TY was trialed at work face with hard rock and high ground stress. Work procedure and performance of the roadheader were recorded and analyzed.

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  • Suitability of Brisbane Rock Conditions to Roadheader

    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 SouthEast Queensland are utilising roadheaders to excavate sections of the tunnel which pass through the

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  • high quality hard rock tunneling roadheader

    rock bits carbide tooth KAMY China KAMY Company has Excavation of HighStressed Hard Rock with Roadheader Grasping strong production capability, advanced research strength and excellent service, KAMY

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  • The Importance of Research on Alternative and Hybrid Rock

    Jan 27, 2017 · The Importance of Research on Alternative and Hybrid Rock Extraction Methods. Authors Fast excavation of hard rock (UCS range from 150 to 300 MPa) Flexible excavation. Low energy consumption. The roadheader concept gives this system a high flexibility. But the appliion of a single oscillating cutting disc raises questions regarding

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  • AQM 150 Roadheader Antraquip Corporation Roadheaders

    The Antraquip AQM150 roadheader is a heavy weight class roadheader designed for tunneling and soft to medium hard rock Mining appliions. Features and Values. Capable of cutting very hard rock economically Integrated high pressure pick flushing system – increased safety and pick life

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  • Excavation of HighStressed Hard Rock with Roadheader

    About Us. Shanghai Kamy Mechanical and Electrical Co.,Ltd. is a professional engaged in coal mining, tunneling, transport equipment research and development, manufacturing and sales of largescale equipment manufacturing enterprises, the main German import cutter, bitsoft grams tooth, betek cutting teeth, imports of shearer, imports of pick, rotary drill bits, boring machine and a series of

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  • Roadheader excavation performance

    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. Every now and again problems have been encountered leading to high

    Get price
  • Roadheaders in Tunneling Tunnel Business Magazine

    The selection of the right rock cutting and excavation method is the starting point for every project and determines the project''s success or failure. Over the last decade, major changes have occurred not only in the development of the TBMs, but also with the technology of rock cutting via roadheaders and rock cutting attachments.

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  • MINGUIDE

    Description. The starting point for the development of the MX650 Rapid Mine Development System was a request by mining companies about ten years ago simply saying: "Just give me a roadheader which can do hard rock cutting."

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  • Ug mechanical excavation SlideShare

    May 06, 2011 · Ug mechanical excavation coal Mechanical dredges for placers and soilClassifiion of Underground mechanical excavator by rock type Hard rock Soft rock 1.Roadheader 1.Roadheader 2.TBM 2.Continuous Miner 3.Mobile Miner 3.Shearer 4.Raise BorerComparison of mechanical excavation with drill and blast systems Advantages Disadvantages

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  • Geotechnical Risk Assessment and Selection of Suitable

    the 1960s, use of roadheader for mechanized tunneling began and by the end the 1970s, it gained considerable acceptance worldwide. In the past decade, the development of roadheader in tunneling has reached a cutting level not only in soft rock but also in medium to hard rock.

    Get price
  • TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND

    TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND FUTURE CHALLENGES ZHAO Jian (hard rock) tunnels. Seikan tunnel (197288), 54 km long with undersea length of 23 km. Gjovik cavern (19911993), largest rock cavern of 61 used for rock excavation. 7 Rock Excavation: DrillandBlast

    Get price
  • Publiions and Seminar Notes Earth Mechanics Institute

    7) L. Ozdemir, B. Nilsen, "Recommended Laboratory Rock Testing For TBM Projects " FIELD CUTTERLOAD / THRUST MEASUREMENTS FOR HARD ROCK TBMS. 1) Wang F., Ozdemir L., and Fishman C., "Tunnel Boring Machine Instrumentation ", Rapid Excavation and Tunneling Conference (RETC) Proceedings, 1979. ROADHEADER

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  • Geological limits in roadheader excavation Four case studies

    prior to tunnelling projects. During the last few years in mechanical excavation, problems have occured also connected with the accurate prediction of excavation rates in soft and hard rock. Every now and again problems have been encountered leading to high

    Get price
  • Development of a Prototype Hard Rock Excavating Machine.

    Incorporating a synergy of lowvelocity, high energy impact and kerf cutting, this machine offers a competitive alternative to drilling and blasting in hard rock. It is a boom mining machine that incorporates the features of a lightweight roadheader, and it can mine nearly any shape opening in hard rock.

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  • Road Headers Products MITSUI MIIKE MACHINERY CO., LTD.

    The MRHS100 road header is suitable for diverse geological conditions ranging from soft rock to mediumhard rock and enables lowvibration tunneling. Equipped with a 100kW 2speed motor, the MRHS100 has power to excavation of mediumhard rock. The telescopic mechanism enables flexible excavation from a fixed position.

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