基于地震动土压力非线性分布的集中参数法研究

为简化结构与土体之间接触面的相互作用,提出采用集中参数法进行分析,即在满足Mononobe-Okabe理论基本假设的前提下,给出了在有土体表面均布荷载作用下地震加速度沿挡土墙高度均匀与线性分布的地震动土压力非线性分布,类比水体附加质量原理,推导了基于给出的地震作用下非线性动土压力分布的附加质量计算公式,给出了土体附加刚度在集中参数中的模拟,并进行了算例验证。结果表明,采用集中参数法模拟在地震作用下土体对挡土结构的作用简便、有效、实用。

Concentrated Parameter Model Based on Nonlinear Distribution of Seismic Earth Pressure

In order to simplify the contact surface interaction between structure and soil mass, concentrated parameter method is proposed. If the conditions of Mononobe-Okabe theory are met, the nonlinear distribution of seismic earth pressure under action of uniform load on soil surface are given in case of uniform and linear distribution of seismic acceleration along the height of retaining wall. Referring to the theory of water additional mass, it deduces the formula of soil additional mass based on the given linear distribution of seismic earth pressure. The soil additional stiffness is simulated with concentrated parameters. An example is used to verify the formula and concentrated parameter model. The results show that the proposed method is simple and effective for simulating the effect of soil mass on retaining structures under the action of seismic load; and it can be widely used in engineering.