基于土体连续性作用下挡土墙动力响应的显式闭合形式解

挡土墙-土动力相互作用是影响挡土墙地震响应的关键因素.基于连续介质模型分析挡土墙-土动力相互作用是当前主要的研究手段.但当前的连续介质模型无法获得挡土墙-土动力相互作用中各物理量的精确表达式,这对揭示挡土墙地震响应机理产生了阻碍.通过引入最小二乘响应面法改进了一种连续介质模型,并与现有方法进行对比,对地震作用下挡土墙动...

Explicit closed form solution to dynamic response of retaining wall under continuous action of soil

The dynamic interaction between retaining wall and soil is the key factor affecting the seismic response of retaining wall.To analyze retaining wall-soil dynamic interaction based on the continuum medium model is the main study method at present.However,the current continuum medium model can’t obtain the accurate expression of each physical quantity in retaining wall-soil dynamic interaction to hinder the disclosure of seismic response mechanism of retaining wall.Here,a continuous medium model was improved by introducing the least square response surface method,and compared with the existing methods,the dynamic response of retaining wall under earthquake was studied with the improved model.The retaining wall soil-dynamic interaction was divided into flexural stiffness of retaining wall,soil continuous action,soil spring action,soil body inertial force action and retaining wall inertial force action.The study results showed that the proposed model can provide simple and accurate calculation for dynamic response of retaining wall;parametric analysis reveals translation factor and rotation factor are very sensitive to frequency of incident wave,and are also largely affected by relative flexibility coefficient of retaining wall,while internal force of retaining wall is very sensitive to relative flexibility coefficient,rotation degree coefficient and incident wave frequency,and constraint conditions also more largely affect dynamic response of retaining wall.