Seismic stability of reinforced soil walls under bearing capacity failure by pseudo-dynamic method
来源期刊：中南大学学报(英文版)2013年第9期
论文作者：RUAN Xiao-bo(阮晓波) SUN Shu-lin(孙树林)
文章页码：2593 - 2598
Key words：reinforced soil walls; seismic stability against bearing capacity; seismic active force; pseudo-dynamic method
Abstract: In order to evaluate the seismic stability of reinforced soil walls against bearing capacity failure, the seismic safety factor of reinforced soil walls was determined by using pseudo-dynamic method, and calculated by considering different parameters, such as horizontal and vertical seismic acceleration coefficients, ratio of reinforcement length to wall height, back fill friction angle, foundation soil friction angle, soil-reinforcement interface friction angle and surcharge. The parametric study shows that the seismic safety factor increases by 24-fold when the foundation soil friction angle varies from 25° to 45°, and increases by 2-fold when the soil-reinforcement interface friction angle varies from 0 to 30°. That is to say, the bigger values the foundation soil and/or soil-reinforcement interface friction angles have, the safer the reinforced soil walls become in the seismic design. The results were also compared with those obtained from pseudo-static method. It is found that there is a higher value of the safety factor by the present work.
RUAN Xiao-bo(阮晓波)1, SUN Shu-lin(孙树林)2
(1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
2. College of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China;)
Abstract:In order to evaluate the seismic stability of reinforced soil walls against bearing capacity failure, the seismic safety factor of reinforced soil walls was determined by using pseudo-dynamic method, and calculated by considering different parameters, such as horizontal and vertical seismic acceleration coefficients, ratio of reinforcement length to wall height, back fill friction angle, foundation soil friction angle, soil-reinforcement interface friction angle and surcharge. The parametric study shows that the seismic safety factor increases by 24-fold when the foundation soil friction angle varies from 25° to 45°, and increases by 2-fold when the soil-reinforcement interface friction angle varies from 0 to 30°. That is to say, the bigger values the foundation soil and/or soil-reinforcement interface friction angles have, the safer the reinforced soil walls become in the seismic design. The results were also compared with those obtained from pseudo-static method. It is found that there is a higher value of the safety factor by the present work.
Key words:reinforced soil walls; seismic stability against bearing capacity; seismic active force; pseudo-dynamic method
