Undercut excavation with protection against seismic events or ex

Details Undercut excavation with protection against seismic events or ex Undercut excavation with protection against seismic events or ex

1998-04-09

1999-08-31

Taylor, Dennis L.

Hydraulic and earth engineering

Foundation

Columnar structure

521699, 405229, E02D 530

Patent

active

059444533

ABSTRACT:
An undercut excavation method is provided, which is particularly suitable as an undercut-and-fill mining method, wherein concrete posts are inserted into holes drilled in the ground and are used to support a concrete floor poured on their top ends, which serves as a roof for the lower excavation level. The bottom ends of these posts rest on resilient elements to provide protection against seismic events or excessive ground movements. Excavation beneath such roof is thereby safely carried out in areas prone to seismic events such as rock bursts or earth quakes or to excessive ground movements. The concrete posts may be attached to the resilient elements at their bottom ends, thereby producing yielding posts suitable for such excavation. For still greater safety, a double post system may be used, which involves placing a second post beside the first after excavation on a given level and tying them all together with the concrete used to make the floor/roof for the next lower level of excavation. In mining this is called double-post mining or DPM.

REFERENCES:
patent: 1746566 (1930-02-01), Tufts
patent: 2194279 (1940-03-01), Goldsborough
patent: 4045968 (1977-09-01), Gerwick
patent: 4073148 (1978-02-01), Zaretti
patent: 4266379 (1981-05-01), Aguilar
patent: 4574540 (1986-03-01), Shiau
patent: 4887398 (1989-12-01), Lenten
patent: 4990026 (1991-02-01), Ofenstein
patent: 5522676 (1996-06-01), Gryba

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