Study of relationship between maximum collapsing depth and neutral point position of pile foundation in collapsible loess ground

doi:10.16285/j.rsm.2015.S2.039

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Study of relationship between maximum collapsing depth and neutral point position of pile foundation in collapsible loess ground
	Huang, Xue-Feng 1,2; Yang, Xiao-Hui 1; Yin, He 2; Liu, Zi-Long 1; Zhou, Jun-Peng 2
刊名	Yantu Lixue/Rock and Soil Mechanics
	2015-08-10
卷号	36 页码:296-302
关键词	Friction Pile foundations Sediments Skin friction Structural design Collapsible loess Immersion tests Maximum collapsing depth Negative skin friction Neutral points
ISSN号	10007598
DOI	10.16285/j.rsm.2015.S2.039
英文摘要	The maximum collapsing depth of collapsible loess ground is closely related to the neutral point position of pile foundation. In order to solve the problem of improper pile foundation design, the accurate determination of the collapsing depth is of key importance. Based on a systematic analysis of experimental results obtained from Ningxia, Guyuan series of pile foundation and Heping town in Lanzhou ground treatment test and other area immersion test, the relationship between the maximum collapsing depth and neutral point position of pile foundation is revealed. The research results can be divided into the following four points. 1) Because of the limited vertical penetration depth of the homogeneous loess in the field immersion test (generally 20-25 m), the maximum collapsing depth is limited as well. The collapse coefficient in indoor test cannot be directly adopted to evaluate the collapsing depth. 2) The recommended values of the collapse coefficient δs or dead weight collapse coefficient δzs varying with the region and the collapsing depth are given. Meanwhile, the depth modification coefficient and earth immersion probability coefficient are suggested to be introduced into calculating collapsing depth and their reference values ς are provided as well; the difference between the indoor and outdoor can thus be effectively decreased. 3) The maximum collapsing depth calculated in indoor test is some kind of over conservative, the adverse effects of negative skin friction are overly exaggerated in most actual projects, rendering the smaller design load-carrying capacity. 4) When the depth of the neutral point of the pile foundation is less than 20-25 m and maximum collapsing depth is smaller than 20 m, the neutral point should be determined by the evaluation depth. The estimation method of negative skin friction is provided and It could be more appropriate if the negative skin friction of foundation pile is set as 20-35 kPa. ©, 2015, Academia Sinica. All right reserved.
WOS研究方向	Engineering
语种	中文
出版者	Academia Sinica
WOS记录号	WOS:000409732800039
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113103]
专题	土木工程学院
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China 2.Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing; 400041, China;
推荐引用方式 GB/T 7714	Huang, Xue-Feng,Yang, Xiao-Hui,Yin, He,et al. Study of relationship between maximum collapsing depth and neutral point position of pile foundation in collapsible loess ground[J]. Yantu Lixue/Rock and Soil Mechanics,2015,36:296-302.
APA	Huang, Xue-Feng,Yang, Xiao-Hui,Yin, He,Liu, Zi-Long,&Zhou, Jun-Peng.(2015).Study of relationship between maximum collapsing depth and neutral point position of pile foundation in collapsible loess ground.Yantu Lixue/Rock and Soil Mechanics,36,296-302.
MLA	Huang, Xue-Feng,et al."Study of relationship between maximum collapsing depth and neutral point position of pile foundation in collapsible loess ground".Yantu Lixue/Rock and Soil Mechanics 36(2015):296-302.