输电线路掏挖基础承载特性离心机试验研究

doi:10.13722/j.cnki.jrme.2020.0270

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Abstract The excavated foundations have been widely used in transmission line construction. The bearing capacity characteristics of excavated foundations in stiff clay under different loading conditions are investigated in this study by a series of centrifugal model tests. The results show that the failure mode of foundation soil under solo uplift loading is affected by the embedment ratio of foundations and the critical embedment ratio is between 2 and 3. For high outcropping foundations，the horizontal bearing capacity will reduce significantly with increasing the dimensionless outcropping height. The ultimate uplift capacity of no outcropping foundations with an embedment ratio of 2 will increase to some extent when the horizontal load is applied first. The greater the horizontal load，the stronger the uplift capacity. Under the same horizontal load at the foundation top and the same moment at the ground point before pullout，the ultimate uplift resistance of outcrop foundations with an embedment ratio of 2 has a difference no more than 10% with that of no outcrop foundations，which indicates that the moment of outcrop foundations at the ground point has no obvious influence on the uplift resistance under combined uplift and horizontal loading. The research work can provide a reference for the design of excavated foundations of transmission lines in various loading cases.

Key words： foundation engineering excavated foundation stiff cohesive soil centrifuge model test combined loading bearing capacity

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	Articles by authors
	HAO Dongxue1
	LIU Zhujiang2
	CHEN Rong1
	XUE Yan2
	ZHAO Wei3

Cite this article:

HAO Dongxue1,LIU Zhujiang2,CHEN Rong1, et al. Centrifuge model test study on bearing capacity of excavated foundations of transmission lines#br#[J]. , 2020, 39(9): 1921-1929.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0270 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I9/1921

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