HIGH STRENGHT AERATED CEMENT BULKHEADS

9th International Symposium on Mining with Backfill
R M SMART, DANIEL JACOBUS RAS,
Abstract ABSTRACT


HIGH STRENGHT AERATED CEMENT BULKHEADS


A sub-level open stoping method is being used to mine the massive deposits at TARGET Gold Mine which uses backfill. This requires the construction of bulkheads to contain the freshly placed backfill capable of resisting the hydraulic pressure imposed by filling. The bulkheads are required to contain an 8 meter load of backfill slurry within 48 hours and withstand the force exerted by a 35 meter load of consolidated fill, the maximum height of the planned stope, at a maximum estimated fill density of 1.9.

The Target drives are approximately 20m² (5m wide x 4m high), and can be at various horizons around the stope.

In addition the following requirements apply to the bulkheads:

a) Rapidity and ease of construction using a minimum of materials hence cost-effectiveness.

b) Each bulkhead can be constructed from one side only; the stope side of the bulkheads is inaccessible.

c) The bulkhead must be able to withstand seismic events and blasting concussion.

A variety of methods of construction were evaluated, it was decided to construct the bulkheads using the low density, fast-setting foamed cement-based product,
TEKSEAL HS manufactured by MINOVA RSA. The cement foam is contained between steel and mesh walls of low cost and ease of construction, a method specifically designed for the TARGET bulkheads.

The paper will describe the design, trialling and construction of the bulkheads, and the results obtained to date.




Keywords: Bulkhead, AERATED CEMENT, Backfill
Full Access to Technical Paper
PDF version for $20.00
Other papers from 9th International Symposium on Mining with Backfill