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| EXPERIMENTAL RESEARCH ON BEARING CHARACTERISTIC OF LARGE-DIAMETER AND SUPER-LONG BORED PILE IN
GUANGDONG AREA |
| ZHAO Chunfeng1，2，LI Jun1，2，QIU Zhixiong3，ZHAO Cheng1，2，ZOU Yuwan2，4 |
| (1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. Guangdong Chaohui Expressway Co.，Ltd，Guangzhou，Guangdong 510100，China；4. China Nuclear Power Design Co.，Ltd(Shen Zhen)，Shenzhen 518000，Guangdong) |
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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.
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2015, Vol. 34 
