SYMPOSIA PAPER Published: 01 January 1990
STP25305S

Improvement of Mine Spoils in Southern Illinois

Source

Field tests were conducted to evaluate the feasibility of preloading and dynamic consolidation to improve the compressibility characteristics of a mine waste spoil approximately 30 m deep. The mine spoils consisted of coarse granular materials ranging in size from sand to boulders for the lower 11 m and a heterogeneous mixture of materials ranging from clays to boulder size rock fragments for the upper 19 m.

A test fill approximately 7.6 m high was constructed in 10 days, and settlements were measured at various depths over a period of 200 days. Settlements as large as 45 cm were measured and most of the settlement occurred as soon as the test fill was completed.

Dynamic consolidation was performed in two test areas using different pounding grid configurations. The test areas were approximately 0.2 and 0.4 hectares, respectively. Dynamic consolidation was performed with a 16 ton pounder falling approximately 20 m. Geophysical tests as well as pressure meter tests indicate significant improvement of the spoils over depths of 9 m to 12 m.

Author Information

Koutsoftas, DC
Kiefer, ML
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Details
Developed by Committee: D18
Pages: 153–167
DOI: 10.1520/STP25305S
ISBN-EB: 978-0-8031-5130-7
ISBN-13: 978-0-8031-1285-8