基于FLAC^(3D)的桩板结构在堆积体边坡中的地震响应评价

Seismic Response Evaluation of Pile-Slab Structure in Deposit Slope Based on FLAC^(3D)

针对桩板结构的稳定性问题,采用FLAC^(3D)仿真计算软件,研究不同参数下桩板墙在堆积体边坡中的地震响应,并对桩板结构的抗震效果进行评价。研究结果表明:结构动力特性对抗震效果影响显著,在坡体自振频率附近地震波对坡体会产生更大伤害;在地震基本烈度VII、VIII度区,桩板墙可有效起到抗震作用,但在地震基本烈度IX度区,桩身位移超过桩身10%,不能满足抗滑需要;桩间距的不同,直接影响桩身土压力的分布,在一定范围内,桩背土压力会随着桩间距的减小而减小;滑体的参数(c、φ)对抗滑桩桩背土压力影响小于桩身位移;工程中,应综合考虑多种因素对桩板结构进行设计,避免造成资源浪费。

Focusing on the stability of the pile-slab structure,FLAC^(3D) simulation calculation software was used to study the seismic response of pile-slab wall in the deposit slope under different parameters by numerical analysis method,and the seismic effect of pile-slab structure was evaluated.The results show that the dynamic characteristics of the structure have a significant effect on the seismic effect,and the seismic wave near the natural frequency of the slope has a greater damage to the slope;in the seismic intensity areas of VII and VIII,the sheet pile wall can effectively play an anti-seismic role,but in the seismic intensity area of IX,the displacement of the pile exceeds 10%of the pile length,which cannot meet the needs of anti-sliding;the difference of pile spacing directly affects the distribution of soil pressure on pile and in a certain range,the soil pressure on pile back will decrease with the decrease of pile spacing;influence of parameters of sliding body on back earth pressure of anti-slide pile is less than pile displacement;various factors should be considered in the design of pile-slab structure to avoid waste of resources.