Preliminary exploration of tests on effect of micro-immersion on negative skin friction of pile foundation

doi:10.11779/CJGE2018S1001

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	Preliminary exploration of tests on effect of micro-immersion on negative skin friction of pile foundation
	Zhu, Yan-Peng 1,2,3; Yang, Kui-Bin 1,2,3; Wang, Hai-Ming 1,2,3; Yang, Xiao-Hui 1,2,3
刊名	Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
	2018-05-01
卷号	40 页码:1-7
关键词	Bearing capacity Friction Geotechnical engineering Pile foundations Sediments Skin friction Soils Bearing capacity of pile foundations Collapsible loess Distribution characteristics Foundation construction Geological conditions Micro-immersion Negative skin friction Ultimate bearing capacity
ISSN号	10004548
DOI	10.11779/CJGE2018S1001
英文摘要	In order to solve the problem of negative skin friction of pile foundation in collapsible loess areas, a new idea is proposed to improve the bearing capacity of pile foundation by immersion of the soil around the pile to eliminate part of the loess collapsibility in the process of pile foundation construction. Taking it as a starting point, the concept of micro-immersion is introduced, and the field tests are designed. A preliminary exploration is made on the distribution characteristics and development laws of negative skin friction of pile side under different geological conditions and the degree of micro-immersion. The results show that the high technology of pressure circulation grouting forming pile can achieve micro-immersion of soil around the pile to make it pre-collapse at first, and it can enhance the moisture content of soil significantly within the scope of certain depth below leakage layer and form strong immersion sections, and then it may lead to re-collapsibility and cause negative friction. The discontinuous distribution of the leakage slurry layer in the soil layer results in discontinuous collapsibility of the soil around the pile after the pile is loaded, and the negative skin friction of the pile side shows a staggered distribution along its length. With the gradual increase of the degree of micro-immersion, the positive friction resistance of the pile side is gradually weakened, and the ultimate bearing capacity of the single pile decreases gradually. At the same time, the negative skin friction of the pile side increases gradually, but the increase is small and the value is small. Finally, the shortcomings of this experiment are pointed out and the future research is prospected. © 2018, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
语种	中文
出版者	Chinese Society of Civil Engineering
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114816]
专题	土木工程学院
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou; 730050, China; 3.Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhu, Yan-Peng,Yang, Kui-Bin,Wang, Hai-Ming,et al. Preliminary exploration of tests on effect of micro-immersion on negative skin friction of pile foundation[J]. Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering,2018,40:1-7.
APA	Zhu, Yan-Peng,Yang, Kui-Bin,Wang, Hai-Ming,&Yang, Xiao-Hui.(2018).Preliminary exploration of tests on effect of micro-immersion on negative skin friction of pile foundation.Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering,40,1-7.
MLA	Zhu, Yan-Peng,et al."Preliminary exploration of tests on effect of micro-immersion on negative skin friction of pile foundation".Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering 40(2018):1-7.