穿越巨厚卵石层超长嵌岩桩施工技术与成桩质量分析

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Abstract An engineering project of the super-long rock-socketed bored piles crossing a huge thick gravel layer with about 40 m depth was conducted at a 350 m high-rise building in Wenzhou area. The selection of drilling machine，the drilling method in different soil layers，the construction technology in crossing a huge thick gravel layer，the preparation of mud and the bore hole cleaning technology were presented to discuss details of the construction technology of the over 100-meter super-long bored piles. Moreover，the pile diameter and the ultrasound test were used to analyze the quality of drilled hole and pile shaft，respectively. In addition，a large tonnage static load test was conducted to capture the bearing capacity and the settlement of test pile. Some key findings indicate that the varying drilling processes，the high quality mud and the variable drilling methods can be adopted in different soil layers during the construction of the super-long bored piles. During a super-long pile construction in a gravel layer，the mud leakage and the borehole collapse can be solved by adjusting the property of mud，whereas the bits with variable diameter and the pump suction reverse circulation drilling can be adopted to improve the drilling efficiency. The static load test shows that the percentage of the super-long pile settlement at the pile head caused by the pile compression is over 90% within the working load. It can also be concluded that the thickness of the sediments at the pile end has an influence on the settlement of the super-long pile.

Key words： pile foundations super-long rock-socketed pile huge-thick gravel layer construction technology settlement pile compression

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	Articles by authors
	ZHANG Zhongmiao1
	2
	ZHANG Qianqing1
	2
	LUO Jiacheng3
	LIN Xin4

Cite this article:

ZHANG Zhongmiao1,2,ZHANG Qianqing1, et al. CONSTRUCTION TECHNOLOGY AND PILE QUALITY ANALYSIS OF SUPER-LONG ROCK-SOCKETED PILE CROSSING A HUGE-THICK GRAVEL LAYER[J]. , 2010, 29(S2): 4016-4026.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4016

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