Generator for dynamic loading of a mine lining

Details Generator for dynamic loading of a mine lining Generator for dynamic loading of a mine lining

1986-01-07

1988-01-12

Taylor, Dennis L.

Hydraulic and earth engineering

Miscellaneous

405291, 405294, E21D 1100

Patent

active

047187930

ABSTRACT:
A generator for dynamic loading of a mine lining simulates an unstable ground structure, such as a "bump" of the formation roof by an explosion of an explosive. The generator /3/ comprises a cylinder /6/ with a piston /7/, the said piston functioning as a percussion member. The bottom of the cylinder /6/ is provided with symmetrical chambers /10/ to place an explosive. The explosive is batched to each of chambers /10/ through holes /8, 9/ made in the flank of the cylinder /6/. Holes /8, 9/ are bored at an angle enabling gravitational filling of the chamber /10/ with an explosive already after initial spragging of the lining section /1/ under test between the floor /2/ and the generator /3/ abutting the roof /5/ of the test-stand. The cylinder /6/ is closed with a limiter /12/ of the stroke of the piston. Between the piston /7/ and the limiter /12/ of its stroke there is a shock-absorbing washer /13/. In the limiter /12/ there are additional holes for release of powder gases.

REFERENCES:
patent: 3375668 (1968-04-01), Allen
patent: 3732725 (1973-05-01), Allen, Jr. et al.
patent: 3820703 (1974-06-01), Rangger
patent: 3887237 (1975-06-01), Bailey et al.
patent: 4025029 (1977-05-01), Kotas et al.
patent: 4131299 (1978-12-01), Ono et al.
patent: 4433945 (1984-02-01), Irresberger
patent: 4498391 (1985-02-01), Gergo et al.

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