Three Dimensional Simulation of Pile-soil Interaction Mechanism of Anti-slide Piles under Seismic Loads
FENG Yong;XIE Fei-ya;LI Xu-guang;School of Civil Engineering and Architecture,Henan University of Technology;
Earthquakes are an important factor in inducing slope failure and the anti-slide pile is an important slope-control engineering measure.Therefore,the study of the mechanism of the antislide pile during earthquake activity has important engineering significance for slope protection.Previously,the action mechanism of the anti-slide pile has been mainly studied under static loads and there is a lack of research regarding the pile's response to earthquake activity.Many factors must be simplified when using the two-dimensional analysis method,which affects the accuracy of the results.Taking aproject in Meizhou city,Guangdong province as an example,we used ABAQUS software to establish a three-dimensional model and then analyzed the mechanism of the pile-soil effect under earthquake activity.The results show the following:(1)Under earth-quake activity,the horizontal displacement of the upper part of the slope is relatively large,with a maximum value of 87.05 mm.(2)Under earthquake load,the stress on the anti-slide pile is far greater than that prior to the earthquake:the maximum value under static loads is 147.24 kPa,and the maximum value of the pile body during an earthquake can reach 326.36 kPa.(3)The strain on the anti-slide pile during an earthquake is much larger than that under static loads:The maximum strain under static loads is 4.63×10~(-5) and the maximum strain of the pile during an earthquake is 34.10×10~(-5).Therefore,in practical projects,the strength and stiffness of the pile should be taken into account to determine the need for reinforcement of anti-slide piles subjected to earthquake activity.These research conclusions have direct significance on the prevention and control practices adopted in slope engineering projects.