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