Gas comprehensive way technology for fully mechanized top high gassy coal caving mining face
The paper introduces the background, the technical difficult, the general design and the operation of technical transformation in Xiagou coal mine with longwall top-coal caving mining.
The following research results are obtained: the top coal caving technique and increasing the resistance of the support can reduce the pressure on the coal wall.
The stability of the base structure for the fracture rock-mass of great stress area in Jinchuan lean ore area mining by natural caving process is analyzed by the three-dimensional elastic-plasticity finite element numerical analogy.
Sub-level caving is an efficient and safe mining method.
Contemporary illustrations show cathedral spires collapsing, vaults caving in, high scaffolding keeling over in a chaos of planks and poles.
Finally, the distribution law of stress filed and the causes of goaf caving zone were analyzed according to the primary stress nephogram.
There's something called a trench box - a metal case that holds back the sides of the walls - to be used to stop them caving in when you dig deeper than 5ft.
This paper analyze the problems of expanding mining caving lightly set-up room with traditional shield support, it took the influence to join caving lightly workface.
The caving reasons of the rib area in front of supports is analyzed, at the fully mechanized caving coal face, in the hard roof, soft coal, soft bottom and large inclination thick coal bed.
It adopt dry filling method in the orebody above -350m level and adopt the method of sublevel caving in the orebody under the level. Exploitation engineering already reach -385m level.
Sublevel caving without sill pillar is used in Xishimen Iron Mine.
Aimed at the fault situation of No. 28041 blasting caving face, three kinds of crossing the fault projects are established. Their advantage and shortage are expounded.
This paper discusses some geomechanics problems in block caving.
As the older Uchiha was more prone to caving in to his little brother's requests when he was actually acting his young age, Itachi had consented to let Sasuke ride on his back.
We also introduced statistical way to analyze the strata in the initial roof caving and carried out reasonable classification.
The West Shimen iron mine is produced by sublevel caving mining without pillars.
On the basis of analyzing mechanical situation of floor strata of roadway driving along goaf in fully mechanized sub level caving face, a mechanical model was established.
top slicing combined with ore caving
Based on the successful application of gob-side entry retaining at longwall top coal caving face, a new way for realizing intensive and high efficiency is put forward in thick seams.
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