Recent Developments in Grouting for Deep Mines

by Alfred C. Ackenheil, (M.ASCE), Pres.; A. C. Ackenheil and Assoc., Inc., Consulting Engrs., Pittsburgh, PA,
Murray T. Dougherty, (A.M.ASCE), Assoc.; A. C. Ackenheil and Assoc., Inc., Consulting Engrs., Pittsburgh, PA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 1, Pg. 251-261

Document Type: Journal Paper


Grout-impregnated columns can be used as a means of providing support for structures built over deep mined areas. The columns can be used to maximum advantage in areas of a mine which contain large open voids. The fly ash-cement grout mixes can be designed to approximately equal the strength of the remaining in-place coal pillars. The gravel used in the construction of the columns as well as the fly ash-cement grout used to impregnate the gravel column are injected through a 6-in. air-rotary hole which also serves as the access hole for the bore-hole camera. The horizontal bore-hole camera is a significant development in the tools used in the exploration of a deep mined area. This camera has overcome the major disadvantage of core borings in that areas up to 30 ft diameter can be explored with a bore-hole camera survey, conditions permitting. The vertical camera is also a useful tool in mine exploration and grouting because of the detailed information it can provide on the rock strata above the roof of the mine.

Subject Headings: Cameras | Columns | Boring | Grouting | Fly ash | Gravels | Support structures | Voids

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