广东地区大直径超长钻孔灌注桩荷载传递特性试验研究

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Abstract Based on the large tonnage static load tests of 2 large-diameter and super-long bored piles in Guangdong soft soil area，bearing characteristics and transport mechanism of load are studied in this paper，and the measured results obtained from the tests provide precious data for theoretical research of large-diameter and super-long bored piles in Guangdong area. The results show that load-movement curves of the piles vary gradually. The test piles show the characteristics of friction piles because sharing ratios of pile tip bearing capacity are fewer than 15%. With the increase of pile top load，the increasing rate of relative displacement of piles and soil at certain pile body first increase and then decrease. The ultimate pile-soil relative displacements for completely mobilizing the shaft resistance are found to be about 17mm and 6mm separately in muddy silt clay and silt，22 to 27mm in sand，18mm to 23 in upside silty clay layers of pile. Shaft resistance of upside soil of pile is softened inordinately. The shaft resistance in downside silty clay layers of pile is about more than 87% of ultimate shaft resistance while pile-soil relative displacement is 40mm and increasing rate of the shaft resistance is gently as the relative displacement continues. With the increasing of pile-soil relative displacement，the shaft resistances of weathering sandstone is developing and not fully play finally. Pile side resistance increase as hardening type along with the increasing of pile tip settlement.

Key words： large-diameter and super-long piles slowly ultimate bearing capacity shaft resistance softening pile-soil relative displacement

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http://www.rockmech.org/EN/Y2015/V34/I04/839

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