Design approach for grouted driven piles in calcareous soil
Conference
·
OSTI ID:136633
- Univ. of Western Australia, Nedlands (Australia)
Piles driven into sediments of high calcareous content generally have very low shaft capacity, due to the crushing and rearrangement of the soil grains adjacent to the pile shaft. However, the fictional capacity may be fully recovered by injecting grout into that zone. Such `grouted driven piles` are significantly cheaper to install than conventional drilled and grouted piles, and avoid the potential problems of hole stability in the latter type of pile. The paper describes a systematic program of laboratory tests undertaken to explore the grouting operation and subsequent shaft friction in reconstituted calcareous soil cemented to different strengths. Grouting at this reduced scale is considerably more challenging than at field scale, and yet it has been shown that consistent results, with high shaft friction, can be obtained in all soil types. Design rules are presented in terms of expected grout coverage and relationships between shaft friction, cone resistance of the soil and grouting pressure.
- OSTI ID:
- 136633
- Report Number(s):
- CONF-950501--
- Country of Publication:
- United States
- Language:
- English
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