地震中整体面板式土工格栅加筋土挡墙动土压力研究

土工格栅加筋挡土墙是一种柔性挡土结构,目前尚未建立较严密的设计方法,作用在土工格栅加筋墙壁上的地震动土压力研究是抗震设计的重要内容之一。应用基于拉格朗日法的完全非线性动有限差分法研究整体面板式土工格栅加筋土挡壁在地震作用下各设计参数对挡壁动土压力的影响。采用弹塑性模型模拟填土,采用耦合弹性参数描述格栅与土接触界面特性,参数包括加筋间距、长度、刚度、地震强度和填土性质等,分析墙壁的动土压力沿墙身的分布特征,得出了影响地震动土压力的显著参数,证明了土工格栅加筋墙体的优异吸震能力,研究结果为整体面板式土工格栅加筋土挡墙抗震设计中的动土压力研究提供参考。

Study on Seismic Earth Pressure Acting on Geo-grid Reinforced Soil Retaining Wall with Integral Panel

Geo-grid reinforced retaining wall is a flexible retaining structure, and there is no strict design method for the type of reinforcement structure, and the seismic active earth pressure acting on the reinforced wall is an important research aspect for seismic design theory. A non-linear finite difference method, which is based on Lagrange method, was applied to calculate the seismic active earth pressure acting on the reinforced panel under different design parameters. The elastic-plastic model is applied to simulate the soil, and the coupled elastic parameters are applied to simulate the interaction between backfill soil and geo-grid. The design parameters include reinforcement spacing, reinforcement length, stiffness of geo-grid, seismic intensity and stiffness of backfill soil and foundation. The distribution form and value of seismic active earth pressure along the reinforced retaining wall height are studied. Some parameters sensitive to seismic active earth pressure acting on the panel of the reinforced soil retaining wall are achieved, and high absorption ability is certified under earthquake, which will provide some reference to the study of seismic earth pressure in seismic design of geo-grid reinforced soil retaining wall with integral panel.