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STUDY ON CALCULATION METHODS OF NEGATIVE SKIN FRICTION OF PILE IN COLLAPISBLE LOESS AREA

QI Jing-jing

Abstract

The negative skin friction resistance caused by collapsible deformation after water soaking into collapsible loess will reduce the vertical bearing capacity of piles.The principle and variation rule of the negative skin friction of piles in collapsible loess were analyzed.With the analysis of on-the-spot survey curves and the prior research results,a new negative friction distribution curve,which is applicable to collapsible loess,was brought out.Based on the effective stress method,a calculation method of negative skin friction resistance in collapsible loess area was also put forward.

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Key concepts: Loess, Geotechnical engineering, Pile, Parasitic drag, Bearing capacity, Deformation (meteorology), Bearing (navigation), Geology