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MGB series Hopper Discharge Feeder

Vibrating feeder is also called vibrating feeder. In the production process,...

MZA/K Series Circular Vibrating Screen

MZA / K series vibrating screen is a new round vibrating screen product base...

MF Series Fixed Shaft Circular Vibrating Screen

MF Series vibrating screen is a new round vibrating screen product based on ...

MC Series Single-Cylinder Hydraulic Cone Crusher

MC series single cylinder hydraulic cone crusher is developed from European ...

MJ Series Jaw Crusher

MJ series jaw crusher is mainly used as coarse crusher. It is made of advanc...

ML Series Vertical Shaft Impact Crusher

Ml series impact sand making machine is a brand new structure of ML impact s...

MS Series Triaxial Horizontal Screen

MS series three-axis elliptical vibrating screen is an international level v...

MGD Series Vibrating Feeder

Vibrating feeder is also called vibrating feeder. In the production process,...

Custom mining stress shape

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    Jul 01, 2015· 2.3. Shape of underground excavations. The stability of underground excavations is affected by its shape, size of opening, in situ stress, and soil conditions , .Even though the shape of the opening mainly depends on the purpose for which it is to be used, the safe design and construction of an underground opening requires the knowledge of the stress distribution and the displacements which

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    strength and stress. The factor of safety (FOS) relates the average pillar strength (S) to the average pillar stress (σ p), as follows: FOS = σ . S (1) When designing a system of pillars, the FOS must be selected with care, because it must compensate for the variability and uncertainty related to pillar strength and stress and mining

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    shape typically indicate excessive levels of horizontal stress. Horizontal stress also causes roof falls of lesser magnitude. Mapping falls in relation to the direction of mining provides some of the information necessary to determine if a series of fails were induced by horizontal stress, Figure 4 demonstrates how a progression of roof

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  • Development of a time-dependent energy model to calculate

    Jun 01, 2015· Note: σ h is the total induced stress; L is the half width of the panel; x is the distance from the center of the panel; σ v is the original in situ stress, and σ v = γH, where H is the depth of cover, γ is the unit weight of overburden; k is the coefficient of stress concentration due to longwall mining; h s is the extracted coal seam thickness; L w is the panel width; E g is the elastic