Certain details of micropile design remain unresolved between various practitioners and such disagreements have limited the acceptability of micropiles in certain quarters. Detailed micropile design is an extremely lengthy and often complex subject, especially when micropile groups are concerned or seismic issues must be addressed. The paper provides a simplified step-by-step design approach discussing initial evaluation of feasibility, review of data, loading combinations and general considerations. Thereafter the final design steps are discussed. These include geotechnical strength limit states, other structural considerations, service limit states, corrosion protection, and some seismic considerations.
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