Mechanical and Coal Burst Breeding Mechanism of Coal ...

2019-11-11  A true triaxial loading and unloading experiment entailing “ y -direction stress loading, z -direction stress unloading, and x -direction displacement fixing” of coal samples was conducted. Through analysis of the stress characteristics, fracture characteristics, and energy evolution in coal samples, the mechanical and coal burst breeding mechanisms of coal samples under true triaxial ...

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Directivity effect of unloading bedding coal induced ...

2017-9-1  In the present coal mining process, in order to reduce and control the threat of coal seam gas, gas drainage is a commonly used method to prevent gas disaster accidents , . Pressure relief through the method of gas drainage is an important technology used for Chinese coalbed methane management.

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Mechanical Behavior Evolution and Damage Characterization ...

2020-10-5  The loading/unloading response ratio (LURR) was used to evaluate the damage of coal under cyclic loading. It is found that LURR is an effective parameter to evaluate the damage of coaly rock under cyclic loading and is also useful in distinguishing different deformation mechanism at different loading

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Fatigue damage evolution of coal under cyclic loading ...

2018-9-22  The experimental study of fatigue damage to coal under cyclic loading is important for guiding the design of pillars in underground coal mines where the pillars may be affected by repeated mining activity. In this paper, the strength, deformation, energy dissipation, and fatigue of samples of coal from a mine in China are studied using cyclic loading with a servo-controlled rock mechanical ...

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Prediction of ash content of unloaded coal based on a ...

2013-9-1  Assuming that there is a bunker, Table 1 shows the dimension of the bunker and parameters of the unloading coal. There are four batches of coal in the bunker, and the ash content of each batch coal is 8%, 9%, 10% and 11% respectively. Fig. 4 shows the unloading coal process at different time.

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Effect of loading rate on mechanical behavior of coal ...

2021-3-17  In the underground tunnels, caverns or bord-and-pillar goaf, the initial damage usually occurs in the surrounding rock or in coal when mining starts. Under the frequent influence of mining stress, mechanical properties of the surrounding coal rock with initial damage, especially the long-term creep performance, are related to the safety and stability of underground engineering. However, under ...

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Damage and Permeability Development in Coal During Unloading

2013-2-2  The CT values and CT scan images obtained from the X-ray CT scan experiments are used to analyze the damage development, and the results of the permeability tests are used to analyze the permeability variation during unloading. Because the reconstituted coal specimens with minimal discreteness are subjected to the same stress path and the same ...

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Energy Evolution of Coal at Different Depths Under ...

2019-5-25  To explore the differences in deformation failure and energy evolution and simulate the real excavation conditions of coal masses at different depths during the coal-mining process, an unloading failure experiment was conducted. The experiment included coal samples at different depths from the no. 15 coal seam of the Ji group in the Pingmei coal-mining area. The sample depths were 300, 600 ...

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RELIABLE AND PRODUCTIVE BULK UNLOADING

2018-9-3  ore and coal. It has a lifting capacity of 32 tons, an unloading capacity of 1500 tph, and an outreach of 40 m. It is equipped with a dust suppression system. The AGD is used with a scissors-type of grab in manual, semi-automatic and automatic modes. The Port of Koper likes the simplicity and reliability of the AGD technology, and now operates ...

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Unloading of Coal from Mineral Wagons in non LNER Areas ...

2016-11-11  Likewise Blaydon. There were some LMS facilities in South London which used bottom-door discharge, I believe. South of Yorkshire, even on the LNER, bottom-discharge unloading facilities were not common; there were some in the Mile End/ Bow area on the GE, which continued to be used for sand after coal traffic ceased.

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Surrounding rock effect on coal burst under unloading ...

2021-8-12  In the coal burst induced by excavation, the burst body is not a closed system because the surrounding rock (the roof and the floor) can work on it. In order to investigate the surrounding rock effect on coal burst caused by unloading, the discretized virtual internal bond is employed to comprehensively simulate the burst process of the rock-coal-rock (RCR) body. The simulation results suggest ...

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Directivity effect of unloading bedding coal induced ...

2017-9-1  In the present coal mining process, in order to reduce and control the threat of coal seam gas, gas drainage is a commonly used method to prevent gas disaster accidents , . Pressure relief through the method of gas drainage is an important technology used for Chinese coalbed methane management.

Get Price

Best Grab Ship Unloader for Sale Ship Coal Unloading ...

2021-3-19  Our grab type ship unloader is your best choice of unloading operation of bulk material ship in bulk cargo dock. Material can be mineral or coal, it is adaptable to the ship with bulk material capacity from 3,000 t to 250,000 t, production capacity from 500 t/h to 3,000 t/h. Our grab ship unloader is characterized as advanced technology ...

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Energy Evolution of Coal at Different Depths Under ...

2019-5-25  To explore the differences in deformation failure and energy evolution and simulate the real excavation conditions of coal masses at different depths during the coal-mining process, an unloading failure experiment was conducted. The experiment included coal samples at different depths from the no. 15 coal seam of the Ji group in the Pingmei coal-mining area. The sample depths were 300, 600 ...

Get Price

This Is How They Unload Coal Trains - Jalopnik

2018-12-27  Unloading of coal at a power plant is much more streamlined with a rotary dumper, also known as a wagon tippler, than with other types of dumpers. The railcar is held in place inside the dumper ...

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A new criterion of coal burst proneness based on the ...

2021-7-1  The pre-peak unloading curve in Fig. 5b is a presumed curve that is difficult to obtain in an actual test because it is difficult to predict the specific peak strength of a coal specimen and unload the stress precisely at the peak strength. Therefore, it is impossible to determine the peak EED through integration, which was used for the other ...

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Notes on the Use of Alternating Current in Unloading Coal

The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data.

Get Price

RELIABLE AND PRODUCTIVE BULK UNLOADING

2018-9-3  ore and coal. It has a lifting capacity of 32 tons, an unloading capacity of 1500 tph, and an outreach of 40 m. It is equipped with a dust suppression system. The AGD is used with a scissors-type of grab in manual, semi-automatic and automatic modes. The Port of Koper likes the simplicity and reliability of the AGD technology, and now operates ...

Get Price

Unloading of Coal from Mineral Wagons in non LNER

2016-11-11  Likewise Blaydon. There were some LMS facilities in South London which used bottom-door discharge, I believe. South of Yorkshire, even on the LNER, bottom-discharge unloading facilities were not common; there were some in the Mile End/ Bow area on the GE, which continued to be used for sand after coal traffic ceased.

Get Price

Old Coal Truck High Resolution Stock Photography and ...

An old engraving of a how a mine safety cage in the 1800s worked. It is from a Victorian mechanical engineering book of the 1880s. The mine safety cage was developed by Pierre-Joseph Fontaine (1810-1877) in 1849. This cage contains tubs of the mined coal being lifted up the shaft to the surface.

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Mechanical behavior and permeability evolution of gas ...

2015-12-1  The coal seam K 2 b is a gas infiltrated layer, with a gas content of 10.14 m 3 /t. The temperature in the coal seam K 2 b is in the range of 28.5 °C to 29.3 °C. The retreat LW mining method with full seam extraction was used, and a “U”-type ventilation

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Directivity effect of unloading bedding coal induced ...

2017-9-1  In the present coal mining process, in order to reduce and control the threat of coal seam gas, gas drainage is a commonly used method to prevent gas disaster accidents , . Pressure relief through the method of gas drainage is an important technology used for Chinese coalbed methane management.

Get Price

Best Grab Ship Unloader for Sale Ship Coal Unloading ...

2021-3-19  Our grab type ship unloader is your best choice of unloading operation of bulk material ship in bulk cargo dock. Material can be mineral or coal, it is adaptable to the ship with bulk material capacity from 3,000 t to 250,000 t, production capacity from 500 t/h to 3,000 t/h. Our grab ship unloader is characterized as advanced technology ...

Get Price

This Is How They Unload Coal Trains - Jalopnik

2018-12-27  Unloading of coal at a power plant is much more streamlined with a rotary dumper, also known as a wagon tippler, than with other types of dumpers. The railcar is held in place inside the dumper ...

Get Price

RELIABLE AND PRODUCTIVE BULK UNLOADING

2018-9-3  ore and coal. It has a lifting capacity of 32 tons, an unloading capacity of 1500 tph, and an outreach of 40 m. It is equipped with a dust suppression system. The AGD is used with a scissors-type of grab in manual, semi-automatic and automatic modes. The Port of Koper likes the simplicity and reliability of the AGD technology, and now operates ...

Get Price

A new criterion of coal burst proneness based on the ...

2021-7-1  The pre-peak unloading curve in Fig. 5b is a presumed curve that is difficult to obtain in an actual test because it is difficult to predict the specific peak strength of a coal specimen and unload the stress precisely at the peak strength. Therefore, it is impossible to determine the peak EED through integration, which was used for the other ...

Get Price

Notes on the Use of Alternating Current in Unloading Coal

The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data.

Get Price

Prediction of ash content of unloaded coal based on a ...

2013-9-1  Assuming that there is a bunker, Table 1 shows the dimension of the bunker and parameters of the unloading coal. There are four batches of coal in the bunker, and the ash content of each batch coal is 8%, 9%, 10% and 11% respectively. Fig. 4 shows the unloading coal process at different time.

Get Price

Unloading of Coal from Mineral Wagons in non LNER Areas ...

2016-11-11  Likewise Blaydon. There were some LMS facilities in South London which used bottom-door discharge, I believe. South of Yorkshire, even on the LNER, bottom-discharge unloading facilities were not common; there were some in the Mile End/ Bow area on the GE, which continued to be used for sand after coal traffic ceased.

Get Price

Old Coal Truck High Resolution Stock Photography and ...

An old engraving of a how a mine safety cage in the 1800s worked. It is from a Victorian mechanical engineering book of the 1880s. The mine safety cage was developed by Pierre-Joseph Fontaine (1810-1877) in 1849. This cage contains tubs of the mined coal being lifted up the shaft to the surface.

Get Price