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US 4,726,712 AGranted
Method of pipeline filling the interstices of controlled caving areas
AssigneeBergwerksverband GmbH
InventorsFriedrich Sill, Ulrich Kramer, Hans Maurer
Life of this patent
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Abstract
In conjunction with the face mining of bituminous coal, previously excavated or some portions of the tunnel are collapsed in a manner to form a mass of debris into which a mixture of electrostatic filter ash and water is injected to stabilize the structure.
Claims10
A method of stabilizing a subterranean structure which contains a mine tunnel, comprising the steps of:
- recovering electrostatic filter ash;
- controllably collapsing a rock structure in a region of said tunnel to form a mass of debris containing interstitial hollow spaces;
- forming a thixotropic slurry of said electrostatic filter ash and water;
- injecting said slurry hydrostatically into said interstitial hollow spaces to at least partially fill said spaces within said mass of debris at boundary zones thereof, said slurry being constituted of 50 to 70% by volume fine-grained solids consisting predominantly of said electrostatic filter ash and of water;
- and
- absorbing water from said slurry into said debris to cause, said solids to form a packing supporting adjoining rock structures against collapse.
3 more elements
Dependencies are inferred from the claim text.