黄土地基中人工挖孔扩底灌注桩负摩阻力试验研究

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Abstract Field tests were conducted to investigate the behavior of negative skin friction，positive skin friction，pile end reaction and neutral plane depth for man-made cast-in-situ belled piles in loess under pre-immersing and loading condition. The test results were also compared with the regulations of the technical code for building pile foundation of China. The results show that：(1) With the pre-immersing，negative skin friction，positive skin friction and pile end reaction are induced and increase with further immersing and the neutral plane gradually descend. The neutral plane depth ratio reaches 0.54–0.61 at the end of pre-immersing process，which is far smaller than that introduced in the technical code for building pile foundation of China. (2) When vertical load is applied on the pile head，negative skin friction decrease accompanied by the increasing of positive skin friction and pile end reaction as well as the ascending of the neutral plane. The neutral plane depth ratio reaches about 0.15–0.61 when P = 11 000 kN，which is also far smaller than that introduced in the technical code for building pile foundation of China. (3) The measured negative skin friction and its distribution dramatically differ from the ones calculated according to the technical code for building pile foundation of China. (4) The negative skin friction and the neutral plane depth are in a dynamic process with the immersing and the loading as well as the pile shaft diameter.

Key words： pile foundations loess soil man-made cast-in-situ belled pile experimental study negative skin friction neutral plane

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	CAO Weiping1
	ZHAO Min2

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CAO Weiping1,ZHAO Min2. EXPERIMENTAL STUDY OF NEGATIVE SKIN FRICTION FOR MAN-MADE CAST-IN-SITU BELLED PILES IN LOESS SOIL FOUNDATION[J]. , 2012, 31(S1): 3167-3173.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/3167

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