8
large inclination Angle and large mining height, it will
cause the phenomenon of support crushing and sometimes
even affect the stability of return air roadway. The dynamic
load between frames is caused by the tipping or sliding of
the upper bracket under the impact along the tilt, causing
the dynamic load between the frames on the lower bracket.
The dynamic and static loads as shown in equa-
tion (6) are applied to 35°, 45°, 55° and 65° inclination
angles respectively on a large scale experimental bench.
The dynamic load can be divided into three types: positive
pressure impact, backward thrust impact and lateral thrust
impact. The static load P0 is 40 kN, and the load increase
amplitude Pr is 0 kN Under dynamic load, positive pres-
sure impact P0 takes 40 kN and Pr takes 8 kN Lateral
thrust impact P0 is 5 kN, Pr is 0.8 kN Push-back impact
P0 takes 3 kN and Pr takes 0.48 kN.
sin^60.0 P th P P e th
r 0 =+-30.0t ^(6)
The twin system can be used to monitor the position
status and load information of the hydraulic support (refer-
ring to the value of the oil pressure sensor in the pumping
station) in real time in the large screen of the multidimen-
sional experimental platform for the dynamic behavior of
layered coal and rock mining, as shown in Figure 9 (a). In
addition, the Android client of the twin system has been
developed, as shown in Figure 9 (b), to facilitate researchers
to view the internal information of the experimental plat-
form in real time around the experimental platform. At the
same time, the system also uses high-definition surveillance
cameras to monitor internal information when the experi-
menters cannot enter directly, as shown in Figure 9 (c).
As shown in Figure 10, a bridge crane is used to send
the hydraulic support into the model preset device, and then
a special material with compressive strength of 18 MPa is
laid around the hydraulic support as the surrounding rock,
and finally the hydraulic support and surrounding rock are
sent into the experimental platform with the preset device.
Inside the test stand, as shown in Figure 11, the sensor array
is covered above the support, the false roof and coal wall are
arranged, and the hydraulic support is raised to make the
test stand fully contact with the system composed of “sup-
port and surrounding rock”, as shown in the figure, and
then the loading experiment is carried out.
Experimental Analysis
The Angle of the large scale test bench was adjusted to 35°
to 65°, and static loads were applied to the roof and hydrau-
lic support, as shown in Figures 12–15(a) the solid model
under different inclination angles, and (b) the twin model
under different inclination angles.
At 35° inclination Angle, when no load is applied to the
hydraulic support, the average load of the sensor on the top
Figure 9. Experimental data monitoring
Figure 10. Experimental materials
Figure 11. Inside the experimental bench
large inclination Angle and large mining height, it will
cause the phenomenon of support crushing and sometimes
even affect the stability of return air roadway. The dynamic
load between frames is caused by the tipping or sliding of
the upper bracket under the impact along the tilt, causing
the dynamic load between the frames on the lower bracket.
The dynamic and static loads as shown in equa-
tion (6) are applied to 35°, 45°, 55° and 65° inclination
angles respectively on a large scale experimental bench.
The dynamic load can be divided into three types: positive
pressure impact, backward thrust impact and lateral thrust
impact. The static load P0 is 40 kN, and the load increase
amplitude Pr is 0 kN Under dynamic load, positive pres-
sure impact P0 takes 40 kN and Pr takes 8 kN Lateral
thrust impact P0 is 5 kN, Pr is 0.8 kN Push-back impact
P0 takes 3 kN and Pr takes 0.48 kN.
sin^60.0 P th P P e th
r 0 =+-30.0t ^(6)
The twin system can be used to monitor the position
status and load information of the hydraulic support (refer-
ring to the value of the oil pressure sensor in the pumping
station) in real time in the large screen of the multidimen-
sional experimental platform for the dynamic behavior of
layered coal and rock mining, as shown in Figure 9 (a). In
addition, the Android client of the twin system has been
developed, as shown in Figure 9 (b), to facilitate researchers
to view the internal information of the experimental plat-
form in real time around the experimental platform. At the
same time, the system also uses high-definition surveillance
cameras to monitor internal information when the experi-
menters cannot enter directly, as shown in Figure 9 (c).
As shown in Figure 10, a bridge crane is used to send
the hydraulic support into the model preset device, and then
a special material with compressive strength of 18 MPa is
laid around the hydraulic support as the surrounding rock,
and finally the hydraulic support and surrounding rock are
sent into the experimental platform with the preset device.
Inside the test stand, as shown in Figure 11, the sensor array
is covered above the support, the false roof and coal wall are
arranged, and the hydraulic support is raised to make the
test stand fully contact with the system composed of “sup-
port and surrounding rock”, as shown in the figure, and
then the loading experiment is carried out.
Experimental Analysis
The Angle of the large scale test bench was adjusted to 35°
to 65°, and static loads were applied to the roof and hydrau-
lic support, as shown in Figures 12–15(a) the solid model
under different inclination angles, and (b) the twin model
under different inclination angles.
At 35° inclination Angle, when no load is applied to the
hydraulic support, the average load of the sensor on the top
Figure 9. Experimental data monitoring
Figure 10. Experimental materials
Figure 11. Inside the experimental bench