7
As shown in Figure 8, Figure (a) (b) (c) is the real model
when the support is raised, and the twin models of figure
(d) (e) (f) can move synchronously with the real support.
PHYSICAL SIMILARITY SIMULATI
EXPERIMENT
Project Overview
A working face of a mine is located in the No. 5 coal seam
of the second mining area. The surface of the working face
is high and gully, with a narrow distribution in the east and
west, and low in the west. The design strike length of the
working face is 2098 m and the dip length is 105 m. The
coal seam inclination of the working face is 36°–46°, with
an average of 44°. The occurrence of coal and rock is stable.
The coal and rock characteristics of the working face are
shown in Table 3.
The working face adopts comprehensive mechanized
large mining height mining technology, mining height of
3.5–4.2 m. The process flow of downward cutting coal
→ upward clearing floating coal → moving frame → push-
ing conveyor is adopted. According to the technical condi-
tions of mine production, 60 ZZ7000/22/45 two-column
hydraulic support and 3 ZZG2000/22/45 transition sup-
ports were selected for the working face.
Experimental Method
Some scholars classify the dynamic load on the large-angle
bracket as compressive dynamic load and inter-frame (side
push) dynamic load. The dynamic load can be divided into
positive pressure impact and push back impact according
to the dynamic load position. This type of dynamic load
has great harm, especially in the environment of stope with
Figure 8. 1:1 mapping of solid model hydraulic support
Table 3. Physical and mechanical characteristics of coal and rock at working face
Name
Name of Coal
and Rock Thickness, m
Compressive
strength,
MPa Peculiarity
Basic roof Medium
sandstone
16.59 100.2 Mainly quartz, strong resistance to weathering, layer
development
Direct roof Pebbly coarse
sandstone
2.32 79.9-100.2 Grayish white, argillaceous cement, weathering fragile
Coal seam 5# Coal 3.58-9.77 3-5 Contains 3-5 layers of dirt, coal dirt interlayer 1.4-2.5 m
Direct bottom Carbonaceous
mudstone
17.06 9.14-12.76 Grayish white, mineral cement
Basic bottom gritstone 9.0 78 Joint development, weathering brittle
As shown in Figure 8, Figure (a) (b) (c) is the real model
when the support is raised, and the twin models of figure
(d) (e) (f) can move synchronously with the real support.
PHYSICAL SIMILARITY SIMULATI
EXPERIMENT
Project Overview
A working face of a mine is located in the No. 5 coal seam
of the second mining area. The surface of the working face
is high and gully, with a narrow distribution in the east and
west, and low in the west. The design strike length of the
working face is 2098 m and the dip length is 105 m. The
coal seam inclination of the working face is 36°–46°, with
an average of 44°. The occurrence of coal and rock is stable.
The coal and rock characteristics of the working face are
shown in Table 3.
The working face adopts comprehensive mechanized
large mining height mining technology, mining height of
3.5–4.2 m. The process flow of downward cutting coal
→ upward clearing floating coal → moving frame → push-
ing conveyor is adopted. According to the technical condi-
tions of mine production, 60 ZZ7000/22/45 two-column
hydraulic support and 3 ZZG2000/22/45 transition sup-
ports were selected for the working face.
Experimental Method
Some scholars classify the dynamic load on the large-angle
bracket as compressive dynamic load and inter-frame (side
push) dynamic load. The dynamic load can be divided into
positive pressure impact and push back impact according
to the dynamic load position. This type of dynamic load
has great harm, especially in the environment of stope with
Figure 8. 1:1 mapping of solid model hydraulic support
Table 3. Physical and mechanical characteristics of coal and rock at working face
Name
Name of Coal
and Rock Thickness, m
Compressive
strength,
MPa Peculiarity
Basic roof Medium
sandstone
16.59 100.2 Mainly quartz, strong resistance to weathering, layer
development
Direct roof Pebbly coarse
sandstone
2.32 79.9-100.2 Grayish white, argillaceous cement, weathering fragile
Coal seam 5# Coal 3.58-9.77 3-5 Contains 3-5 layers of dirt, coal dirt interlayer 1.4-2.5 m
Direct bottom Carbonaceous
mudstone
17.06 9.14-12.76 Grayish white, mineral cement
Basic bottom gritstone 9.0 78 Joint development, weathering brittle