Time Dependence of Neutral Plane Position in a PHC-Supported Soft Subgrade

doi:10.1061/(ASCE)GT.1943-5606.0002748

	Time Dependence of Neutral Plane Position in a PHC-Supported Soft Subgrade
	Zhang, Xianwei 5; Liu, Xinyu 4,5; Chang, Zhixiong 3; Liu, Zhihai 3; Yu, Dunmeng 2; Li, Yue 1
刊名	JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
	2022-02-01
卷号	148 期号:2 页码:13
关键词	Neutral plane (NP) Negative skin friction (NSF) Soft soil Settlement Layered settlement Empirical model
ISSN号	1090-0241
DOI	10.1061/(ASCE)GT.1943-5606.0002748
英文摘要	This case study focuses on an International Circuit project in China where unmanned automobiles are to be tested in the future. The subgrade undergoes extensive settlement because of the widely distributed lacustrine deposits with high void ratio and compressibility. Prestressed high-strength concrete (PHC) pile-supported earth platforms are used for ground improvement in this area, but their effectiveness has not yet been confirmed. Associated with this adoption, the negative skin friction (NSF) of the piles and the related neutral plane (NP) position is of importance. Although NSF has been examined in detail, the NP position has not, especially with regard to its time dependence. This paper reports the settlement of the pile-supported soft soil subgrade as obtained from long-term observations of full-scale tests. The NP position is determined according to the layered settlement of the soil and the pile settlement, both of which are obtained from long-term field observations. The results reveal that the NP position has a clear time dependence that develops in stages. The NP is initially elevated with time, and then it gradually approaches a constant value. The existing models fail to predict this time dependence of the NP position in the studied sites. A exponential model is used, the fitting parameters of which have practical implications. The adopted model works well with the studied sites, especially in terms of reflecting the time dependence of the NP position and distinguishing the different stages of its development. This paper enhances the understanding of the NP and provides a reference data set for related engineering practices.
资助项目	National Natural Science Foundation of China[41972285] ; National Natural Science Foundation of China[41672293] ; National Natural Science Foundation of China[41972293] ; National Natural Science Foundation of China[52178372] ; Youth Innovation Promotion Association CAS[2018363] ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection[SKLGP2020K024] ; Science Fund for Distinguished Young Scholars of Hubei Province[2020CFA103]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ASCE-AMER SOC CIVIL ENGINEERS
WOS记录号	WOS:000730390500015
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30982]
专题	中科院武汉岩土力学所
通讯作者	Liu, Xinyu
作者单位	1.Wuhan Tengyi Engn Inspect Co Ltd, 216 Jianshe Ave, Wuhan 430000, Hubei, Peoples R China 2.Wuhan Municipal Engn Design & Res Inst Co Ltd, 40 Changqing Rd, Wuhan 430000, Hubei, Peoples R China 3.Wuhan Smart Ecol Construct Investment Co Ltd, 188 Dongfeng Ave, Wuhan 430000, Hubei, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xianwei,Liu, Xinyu,Chang, Zhixiong,et al. Time Dependence of Neutral Plane Position in a PHC-Supported Soft Subgrade[J]. JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING,2022,148(2):13.
APA	Zhang, Xianwei,Liu, Xinyu,Chang, Zhixiong,Liu, Zhihai,Yu, Dunmeng,&Li, Yue.(2022).Time Dependence of Neutral Plane Position in a PHC-Supported Soft Subgrade.JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING,148(2),13.
MLA	Zhang, Xianwei,et al."Time Dependence of Neutral Plane Position in a PHC-Supported Soft Subgrade".JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING 148.2(2022):13.