scholarly journals EARTHQUAKE RESPONSE OF PILE FOUNDATION IN HONLINEAR LIQUEFIABLE SOIL DEPOSIT

1995 ◽  
Vol 60 (471) ◽  
pp. 41-50 ◽  
Author(s):  
Yuji Miyamoto ◽  
Yuji Sako ◽  
Eiji Kitamura ◽  
Kenji Miura
Keyword(s):  
Pile Foundation ◽  
Earthquake Response ◽  
Liquefiable Soil

Study on Lateral Dynamic Response of Pile Foundation in Liquefiable Soil by Using FBG Method

2012 ◽  
Vol 238 ◽  
pp. 337-340 ◽  
Author(s):  
Yu Run Li ◽  
Yan Liang ◽  
Xing Wei ◽  
Yun Long Wang ◽  
Zhen Zhong Cao
Keyword(s):  
Dynamic Response ◽  
Data Acquisition ◽  
Pile Foundation ◽  
Maximum Stress ◽  
Shaking Table Test ◽  
Data Acquisition System ◽  
Seismic Damage ◽  
Shaking Table ◽  
Calculation Methods ◽  
Liquefiable Soil

The study on lateral dynamic response of pile foundation in liquefiable soil is a significant part about seismic damage. In this paper, a new data acquisition system of FBG and calculation methods is used in the small shaking table test. The results show that FBG method used in this test is proved to be efficient and acceptable in both time characteristics and precision characteristics, it may be widely applied in the future doubtlessly. What’s more, the characteristics of p-y curves in different peak accelerations are discussed. And varying of maximum stress and displacement by corresponding acceleration is discussed. A contrast about p-y curve between dry sand and saturate sand is related, which provides a new direction in research about p-y curve.

Study of Ground Lateral Flow on Piles Foundation due to Soil Liquefaction

2011 ◽  
Vol 415-417 ◽  
pp. 1478-1481
Author(s):  
Wei Wei Yu ◽  
Xuan Guo
Keyword(s):  
Case Studies ◽  
Pile Foundation ◽  
Soil Liquefaction ◽  
Lateral Flow ◽  
Distributed Load ◽  
Liquefiable Soil ◽  
Calculated Stress ◽  
Stress And Deformation ◽  
Good Agreement

The case studies on the damaged pile foundation caused by lateral flow due to soil liquefaction during the big earthquake were discussed. The distributed load method was utilized to calculate the stress and displacement. The effect of the lateral flow to pile foundation in liquefiable soil also is simulated. Through compared the analysis result to the site dig-investigate report, the mechanism of the damaged pile modes were conjectured very well. the calculated stress and deformation of piles indicated good agreement with the actually observed one. The practicability and availability of the distributed load method was substantiated.

scholarly journals Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248502
Author(s):  
Huang Zhan-fang ◽  
Xiao-hong Bai ◽  
Chao Yin ◽  
Yong-qiang Liu
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Water Pressure ◽  
Seismic Loading ◽  
Shaking Table ◽  
Pile Spacing ◽  
Liquefiable Soil ◽  
Composite Pile ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Composite pile foundation has been widely used in ground engineering. This composite pile foundation system has complex pile-soil interactions under seismic loading. The calculation of vertical bearing capacity of composite pile foundation is still an unsolved problem if the soil around piles is partially or completely liquefied under seismic loading. We have completed indoor shaking table model tests to measure the vertical bearing capacity in a liquefiable soil foundation under seismic loading. This paper will use a numerical approach to analyze the change of this vertical bearing capacity under seismic loading. Firstly, the Goodman contact element is improved to include the Rayleigh damping. Such an improvement can well describe the reflection and absorption of seismic waves at the interface of soil and piles. Secondly, the Biot’s dynamic consolidation theory incorporated an elastoplastic model is applied to simulate the soil deformation and the generation and accumulation of pore water pressure under seismic loading. Thirdly, after verification with our indoor shaking table test data, this approach is used to investigate the effects of pile spacing on liquefaction resistance of the composite pile foundation in liquefiable soil. The time histories of pore water pressure ratio (PPR′) are calculated for the liquefiable soil and the vertical bearing capacity in partially liquefied soil is calculated and compared with our indoor shaking table test data at the 3D, 3.5D, 4D, 5D and 6D cases (D is the pile diameter). It is found that the pile spacing has some influence on the extent of soil liquefaction between piles. The vertical bearing capacity varies with liquefaction extent of inter-pile soil. The optimization of pile spacing varies with liquefaction extent. These results may provide some reference for the design of composite pile foundation under seismic loading.

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