Numerical and test study on vertical vibration characteristics of pile group in slope soil topography

• Published in: Earthquake Engineering and Engineering Vibration Vol. 20; no. 2; pp. 377 - 390
• Main Authors: Liming, Qu, Xuanming, Ding, Changjie, Zheng, Chongrong, Wu, Guangwei, Cao
• Format: Journal Article
• Language: English
• Published: Harbin Institute of Engineering Mechanics, China Earthquake Administration 01.04.2021; Springer Nature B.V; College of Civil Engineering, Chongqing University, Chongqing 400045, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China; MOE Key Laboratory of High-Speed Railway Engineering, College of Civil Engineering, Southwest Jiaotong University,Chengdu 610031, China%School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China
• Subjects: Algorithms; Bedrock; Civil Engineering; Control; Displacement; Dynamical Systems; Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Mathematical models; Model testing; Numerical analysis; Pile caps; Pile groups; Piles; Subsoils; Technical Papers; Thickness; Topographic effects; Topography; Vibration; Vibration analysis; Vibration response; model test; pile group; topography effects; numerical method; vibration response
• ISSN: 1671-3664; 1993-503X
• DOI: 10.1007/s11803-021-2026-7

Topography effects on the vertical vibration responses of pile group are revealed though numerical analysis and model tests. First, a series of model tests with different topography of ground and bedrock are conducted. The results indicate that displacement amplitude of the pile head in sloping ground topography is larger than in horizontal ground. Differential displacement at various positions of the pile cap is observed in non-horizontal topography. Afterwards, a numerical algorithm is employed to further explore the essential response characteristics in group piles of different topography configurations, which has been verified by the test results. The lengths of the exposed and frictional segment, together with the thickness of the subsoil layer, are the dominant factors which cause non-axisymmetric vibration at the pile cap.