A combined shielding structure for protection against ground pressure disasters in mining surrounding rocks
A combined shielding and surrounding rock technology, applied in mining equipment, earthwork drilling, underground chambers, etc., can solve the problem of shielding elastic energy shock stress waves without a clear protection method, so as to avoid the roadway from being damaged by impact and prolong the suction. The effect of saving time and protecting roadway safety
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Embodiment 1
[0040] Required equipment: pressure sensor (to measure the peak pressure of different positions of the shielding structure when the impact stress wave acts), support body (to support the fixed test sample), impact stress wave blocking device (to block the direct impact stress of the explosion when detecting the reflected stress wave impact of waves), explosives with specified performance (select spherical TNT), explosive suspension brackets and other related equipment. In addition, the ground of the test site needs to be hardened or paved with steel plates.
[0041] Local stress wave shock test: The test sample is a reflective inner porous material plate with a thickness of 10cm, the length and width are 100cm, 500gB explosives, the test distance is 1 meter, and a barrier baffle is set 2cm in front of the porous material plate. A small circular hole with a radius of 5 cm is left in the center of the porous material plate, and the blocking baffle and the backing plate are fixed ...
Embodiment 2
[0044] Reflective inner layer reflective test: the test sample is a reflective inner layer porous material plate with a thickness of 10cm, 500gB explosive, and the test distance is 1 meter. The porous material plate is attached to the support fixed by the support body. On the front of the porous material plate, the porous material Between the back of the board and the backing board, No. 1, No. 2 and No. 3 pressure sensors are respectively installed at a distance of 0.5 meters from the reflecting surface blocked by the blocking device. The test results show that the peak pressure of No. 1 position is 0.52MPa, and No. 2 is 0.26MPa. No. 3 is 0.34MPa.
[0045] Tests have shown that the reflective inner layer material has stress wave reflection properties.
Embodiment 3
[0047] Commercially available foamed aluminum material and porous material plate comparative test: the commercially available foamed aluminum material of the same size and thickness and the porous material plate of the present invention, the test conditions are the same as in Example 2, the porous material plate, and the result is that the pressure peak value at No. 1 position is 0.51MPa, No. 2 is 0.21MPa, No. 3 is 0.32MPa; foamed aluminum material plate, the result is that the peak pressure of No. 1 position is 0.50MPa, No. 2 is 0.33MPa, and No. 3 is 0.03MPa;
[0048] The comparison test shows that the reflection performance of the reflective inner layer material to the stress wave is obviously better than that of the commercially available materials.
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