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A plug device for absorbing the energy of an explosion generated during a blasting operation in a bore located in a rock formation including a cup-shaped member having an annular sidewall and a closure wall, the cup-shaped member being constructed of a yieldable material that allows the cup-shaped m

A plug device for absorbing the energy of an explosion generated during a blasting operation in a bore located in a rock formation including a cup-shaped member having an annular sidewall and a closure wall, the cup-shaped member being constructed of a yieldable material that allows the cup-shaped member to form a sealed engagement with the bore thereby forming a barrier to the explosive force, the cup-shaped member includes a corrugated construction on the annular sidewall.

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[ What is claimed:] [1.] Plug means to absorb some of the energy of an explosion generated during a blasting operation where an explosive is positioned in a bore drilled into a rock formation, said plug means comprising a cup-shaped member formed of a relatively yieldable plastic material including

[ What is claimed:] [1.] Plug means to absorb some of the energy of an explosion generated during a blasting operation where an explosive is positioned in a bore drilled into a rock formation, said plug means comprising a cup-shaped member formed of a relatively yieldable plastic material including an annular sidewall closed at one end by a closure wall, whereby said sidewall has at least one annular outwardly extending rib portion and at least one inwardly extending annular groove, the diameter of said cup shaped member substantially conforming to the diameter of the bore drilled into the rock formation with said cup shaped member having an unstressed diameter larger than the bore, said cup shaped member being movable into the bore such that said annular sidewall including said rib yieldably engages the wall of the bore to form a substantially sealed connection between the bore and said cup-shaped member, said cup shaped member acting as a barrier against the forces of an explosion coming through the bore.