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abutment stress width in underground mining

Jan 01 2019 · When the pillar width is 10 m the peak value of stress inside the coal pillar and stress concentration coefficient reaches the maximum when the pillar width is less than 10 m the peak value of stress decreases sharply...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!

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  • Abutment pressure distribution for longwall face mining

    Jan 01 2019 · When the pillar width is 10 m the peak value of stress inside the coal pillar and stress concentration coefficient reaches the maximum when the pillar width is less than 10 m the peak value of stress decreases sharply

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  • Abutment Stress Width In Underground Mining

    an underground mining method used in large steeply dipping orebodies where the wall rock is of an incompetent nature the primary secondary and tertiary stopes are designed with an overall stress management philosophy consisting of stress shadowing and orebody abutment retreat orebody width and orebody grade in cases where very high

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  • CDC Mining Ground Stress in Mining Part 1

    Support Can loads entry closures and Can closures generally were not consistent enough to yield a reasonable degree of success in detecting first arrival of mininginduced abutment stress Ground condition surveys were least sensitive to abutment stress but are the least costly option

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  • abutment stress width in underground mining

    also the width of abutment area as shown in figure 4 where n is the stress concentration factor and p a is the peak value of abutment pressure n the width b of abutment area can be determined by following equation where p a ′ represents the side abutment pressure n and p u represents the ultimate bearing capacity of floor rock mass n

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  • New Abutment Angle Concept for Underground Coal

    New Abutment Angle Concept for Underground Coal Mining Ihsan Berk Tulu West Virginia University Follow this and additional works at httpsetd Recommended Citation Tulu Ihsan Berk New Abutment Angle Concept for Underground Coal Mining 2012 Graduate Theses Dissertations and Problem Reports 3578

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  • “Advance and Relieve” Mining A Method to Mitigate the

    the rear horizontal stress abutment figure 16 This abutment did not advance with the mining but remained stationary In E15 the damage consisted of cutters that developed in the RI entry from the cave outby for a distance of approximately 60 m This stress damage was parallel to the length of the cave Stress damage also occurred in the

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  • Pillar design QueensMineDesignWiki

    The edge of the shaft pillar will be highly stressed as it is an abutment to mining but the interior is mostly at a uniformly lower stress level The following graph is based on the previous one in which the constant interior stress magnitude region is used as a design constraint

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  • PDF Underground mining Methods ResearchGate

    Longwall mining machines are typically 150250 meters in width and 15 to 3 meter s high Longwall miners extr act panels rectangular blocks of coal as wide as the f ace the

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  • Future mining – underground

    Future mining underground encompasses everything from haulage to mine planning to networks and is an area where all the 80 to 240 m in width and 8001000 m in strike length The two orebodies are separated consequence of increasing mining depth stress abutment and

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  • CDC Mining Ground Stress in Mining Part 1

    Support Can loads entry closures and Can closures generally were not consistent enough to yield a reasonable degree of success in detecting first arrival of mininginduced abutment stress Ground condition surveys were least sensitive to abutment stress but are the least costly option

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  • Mininginduced stress distribution of the working face in

    During mining of working face 4851 under the cumulated influence of advancing abutment pressure stress concentration becomes even more significant and the range of high stress concentration area is 30 m from the excavated side along the dip and 60–90 m from the advancing working face along strike as shown in figure 13 Thus some area of the following working faces Y4852 and Y484 near the

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  • A new theoretical method for calculating front abutment

    Nov 19 2019 · The results show that the influence range of the abutment stress remains unchanged after KS1 breaks eg from 0 to 180 m and its peak position shifts forward from 8 to 19 m while the influence range 0‐180 m and its peak position 6‐8 m in front of coal wall remain unchanged after KS2 breaks the abutment stress decreases and the maximum decrease is 39 MPa in the range of 0‐22 m ahead

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  • Mining induced strata movement and roof behavior in

    Sep 18 2015 · The peak abutment stress in key layer over the coal face is 20–25 times the in situ stress and the peak abutment stress in key layer behind the minedout area is 15–18 times the in situ stress After coal mining the peak abutment stress in front of coal face is generally higher than the stable peak abutment stress around the minedout area

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  • Pillar design QueensMineDesignWiki

    The edge of the shaft pillar will be highly stressed as it is an abutment to mining but the interior is mostly at a uniformly lower stress level The following graph is based on the previous one in which the constant interior stress magnitude region is used as a design constraint

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  • Overburden moment and abutment pressure in longwall mining

    Mar 16 2016 · The width of the side abutment pressure zone can be approximated by Ws 93 √h Where h is seam depth Convergence is generally less than 5075 mm before the face moves in

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  • DESIGN OF RIB PILLARS IN LONGWALL MINING BASED

    The maximum concentration of stress on the abutment zone is given by the following equation kg Where Pek abutment pressure MPa Uniaxial compressive strength in situ MPa Cover load MPa When the abutment stress exceeds an excavation breaks and the strata abutment pressure is transferred inbye on the solid pillar thus forming a yield zone surrounding the excavation

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  • Effect of delayed backfill on open stope mining methods

    Open stoping is comprised of large rectangular voids separated by intervening pillars so as to minimize the size of the exposed surface and thereby reducing the potential for wall slough and in turn external dilution These pillars provide support to the exposed wall however they result in ore loss and increased costs such as having to establish slots for blasting Longhole mining methods

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  • Future mining – underground

    Future mining underground encompasses everything from haulage to mine planning to networks and is an area where all the 80 to 240 m in width and 8001000 m in strike length The two orebodies are separated consequence of increasing mining depth stress abutment and

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  • Evaluation of Ground Control Requirements for D Orebody

    Evaluation of Ground Control Requirements for D Orebody LoadHaulDump Block Molycorp click to view entire paper in PDF format41st US Symposium on Rock Mechanics Golden Colorado USA July 1721 2006 Authors B Yu L J Gilbride and J F T Agapito AAIMolycorp Inc’s Questa Mine plans to switch from gravity draw in Block 1 to a loadhauldump LHD draw system in the East and

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  • Glossary of Mining Terms Mineral

    Abutment In coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch of strata spanning the roadway and 2 the weight of the rocks over a longwall face is transferred to the front abutment that is the solid coal ahead of the face and the back abutment that is the settled packs behind the face

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  • The Research on Abutment Stress Distribution and Fracture

    The abutment stress results from the load coming from overlying strata above the influence range of abutment stress and the load which coming from overlying strata above the stress shell passed by the shell Through the mechanical calculationthis paper analyzed abutment stress distribution and fracture characteristics of coal seam resulted from the load of overlying strata passed by stress

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  • NUMERICAL INSIGHTS INTO STRESS REDISTRIBUTION

    When the protected seam is mined 20 m the abutment stress at the coal face is approximately 052 MPa while it increases to a peak value of 169 MPa approximately 5 m ahead of the coal face Then the abutment stress falls to 02 MPa approximately 25 m in front of the coal face

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  • StressStrata Control underground COAL

    The chocks are not resisting the whole vertical stress field most of which is redistributed to the solid coal ahead of the face the front abutment load and to recompacted material in the goaf behind the face the rear abutment load Provided the chock load capacity is sufficient to control the movement of this dead load so that the

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