横向地震作用下土工合成材料加筋土挡墙筋材拉力分析  

Reinforcement loads of geosynthetic-reinforced soil retaining walls under horizontal earthquake loading

作　　者：刘华北[1] LIU Hua-bei(Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《岩土工程学报》2022年第2期288-294,I0003,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51778259)。

摘　　要：土工合成材料加筋土挡墙具备优良的抗震性能,但是,国内外现行的加筋土挡墙筋材动拉力计算方法存在地震动参数选用不尽合理的问题,一方面可能带来结构安全隐患,另一方面也造成了工程界的疑虑。基于此,在前期工作的基础上应用非线性动力有限元法分析了高加筋土挡墙在不同地震激励作用下的地震响应,重点讨论了强震作用下筋材拉力的影响因素。分析结果表明,加筋土挡墙的地震响应同时决定于地震动频谱特性、强度、以及加筋土挡墙对地震动的放大效应,这种综合效应是地震波的传播特点与填土的弹塑性性质共同决定的。加筋土挡墙主动区质心处的根方加速度ars可用于计算加筋土挡墙主动区的地震惯性力,用于估计加筋土筋材地震拉力。The geosynthetic reinforced soil(GRS) retaining walls generally exhibit good seismic performance.However,the existing design specifications generally make use of seismic loading parameters that are not totally rational when it comes to the estimation of seismic reinforcement loads.The inaccurate estimation of the seismic reinforcement loads may then result in an unsafe structure and lead to hesitations in the applications of this type of earth structures.In this study,based on the previous research results by the author,a validated finite element approach is employed to analyze the seismic responses of a tall GRS retaining wall under different earthquake loadings.The important influencing factors on the seismic reinforcement loads are pinpointed,which include the frequency characteristics of the earthquake excitation,its intensity and the amplification of seismic motion in the retaining wall.The combined effects are basically determined together by the characteristics of seismic wave propagation and the elasto-plastic properties of backfill soils.The root-square acceleration ars at the gravity center of the active soil mass in the retaining wall is a proper seismic loading parameter and can be used to estimate the seismic reinforcement loads.

关 键 词：土工合成材料 加筋土挡墙 横向地震作用 筋材拉力 根方加速度 

分 类 号：TU435[建筑科学—岩土工程]