| 摘要 |
An underground cavity formed deep in the earth by detonation of a nuclear device is extended vertically by drilling a borehole from the earth's surface to a depth D which is above the expected top of the cavity chimney by a distance equal to or greater than d, where d is the thickness of a slab of rock of the diameter of the chimney that will be self-supporting. A horizontal propped fracture is created at depth D, and liquid explosive is placed in the fracture and detonated. The shock force of the explosion causes the slab of thickness d to be rubbleized and driven down into the chimney. This process can be repeated for successive slabs of thickness d. Alternatively, vertical boreholes can be drilled outside of an adjacent the wall of the cavity, vertical fractures created with their planes parallel to the wall of the borehole, the fractures loaded with liquid explosive and detonated, causing a slab of the wall to be driven into the chimney and rubbleized.
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