Method for attenuating seismic shock from detonating explosive i

Details Method for attenuating seismic shock from detonating explosive i Method for attenuating seismic shock from detonating explosive i

1978-04-03

1980-03-11

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102 23, 181296, E21C 4110

Patent

active

041925530

ABSTRACT:
In situ oil shale retorts are formed in formation containing oil shale by excavating at least one void in each retort site. Explosive is placed in a remaining portion of unfragmented formation within each retort site adjacent such a void, and such explosive is detonated in a single round for explosively expanding formation within the retort site toward such a void for forming a fragmented permeable mass of formation particles containing oil shale in each retort. This produces a large explosion which generates seismic shock waves traveling outwardly from the blast site through the underground formation. Sensitive equipment which could be damaged by seismic shock traveling to it straight through unfragmented formation is shielded from such an explosion by placing such equipment in the shadow of a fragmented mass in an in situ retort formed prior to the explosion. The fragmented mass attenuates the velocity and magnitude of seismic shock waves traveling toward such sensitive equipment prior to the shock wave reaching the vicinity of such equipment.

REFERENCES:
patent: 2704515 (1955-03-01), Barlow
patent: 2846205 (1958-08-01), Bucky
patent: 3165916 (1965-01-01), Loving et al.
patent: 3397756 (1968-08-01), Andrews et al.
patent: 3917346 (1975-11-01), Janssen

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