Post on 30-Jul-2015
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Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Dr. Rustam Khojayev
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Karagandy Coal-mining Field Map
the Mine n.a. Lenin
the “Kazakhstanskaya” Mine
Kazakhstan on the Globe
Source: GeoMark, Wikipedia Presenter – Dr. Rustam Khojayev
Rectangular cross-section mine working
The rock is considered a continuum
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Presenter – Dr. Rustam Khojayev
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Presenter – Dr. Rustam Khojayev
Strata stress distribution layout
The aerated layer depth
Young's modulus between the gas fissures E0 = 3,5×10
3 MPa
Poisson’s ratio
λmax =1,56λmin = 0,69
ν0 = 0,26
The main factors of the horizontal stress
The mining depth
Volume weight of the overlying strata
Allowable shear stress of the coal
H0 =180 m
H = 500 m
γ = 2,5×104 N m3
τ[ ] = ±1,54 MPa
East
Norh
Normal stresses acting perpendicular to the 0XY plane
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Presenter – Dr. Rustam Khojayev
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
Shear stresses acting perpendicular to the 0XY plane
Presenter – Dr. Rustam Khojayev
0
Longitudinal shearing stress, MPa
Strata stress distribution on the 0XY plane
n =2 1+ν( )π c2
1−τ z(xy)"# $%( )
2
τ z(xy)( )2
&
'(
)(
*
+(
,(
Research of the physical and mechanical properties and the conditions of the outburst-prone rock
1, 2, 3, 4 Fracture zones
28,2
4,6
2,4
1,5
Number of cracks per unit volume
∼ 2,8⋅1013
∼ 1,7⋅1010
∼ 0,9⋅109
0
τ z(xy) n
Number of cracks of the c length per unit volume:
1
2
3
4Presenter – Dr. Rustam Khojayev
Point