加筋土挡墙屈服加速度与永久位移特性的拟动力法研究  

Computation of Sliding Displacements of Reinforced Soil Wall by Pseudo-dynamic Method

作　　者：袁卓亚[1] 王卫山 上官甦 宋彬 王娟[5] 何思明[5,6] 

机构地区：[1]中国交通建设股份有限公司西北分公司,陕西西安710065 [2]西安公路研究院,陕西西安710065 [3]中国公路工程咨询集团有限公司,北京100097 [4]陕西交通建设集团公司,陕西西安710065 [5]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [6]青藏高原卓越中心,北京100101

出　　处：《灾害学》2017年第2期18-25,共8页Journal of Catastrophology

基　　金：NSFC-ICIMOD国际合作基金(41661144041);交通运输部科技项目(2014364J03090)

摘　　要：加筋土挡墙具有良好的抗震性能,广泛应用于地震带边坡加固防护工程,但是其强震荷载下的力学行为仍未有全面认识。而传统的拟静力法和安全系数控制设计方法不能考虑地震加速度时程特征,与地震作用的真实情况不符。该文在极限分析上限定理的基础之上,结合Newmark理论,采用拟动力法,考虑地震加速度的时程变化特征,推导计算加筋土挡墙屈服加速度与永久位移的计算公式,研究地震作用下加筋土挡墙的动力响应。最后通过算例对该方法进行了验算,计算分析地震作用下加筋土挡墙的屈服加速度与永久位移,研究水平地震加速度和竖向地震加速度对加筋土挡墙稳定性的影响。并与传统的拟静力方法结果进行对比,研究结果显示:拟静力法设计的加筋土挡墙可能偏于保守,可能造成不必要的浪费,经济上不合理。Reinforced soil wall has super aseismic performance, which is widely used in slope reinforcement engineer of the seismic zones, but the mechanical behavior under the earthquake loads haven＇ t a fully understand- ing. The traditional pseudo static method and factor of safety control design method can＇ t consider the time history character of seismic acceleration, and it is inconsistent to the real seismic action. In this study, based on the kine- matic theorem of limit analysis the seismic, combined with the Newmark theory, using the pseudo-dynamic method to consider the time history character of seismic acceleration, the expressions of the yield acceleration and the per- manent displacement of reinforced soil wall is derived. We then analyze the dynamic response of the reinforced soil wall. At last, a case is used to illustrate the method. The critical seismic yield acceleration coefficient and the seis- mic permanent displacement of reinforced soil wall under seismic loading are calculated. Meanwhile, the effect of the horizontal seismic acceleration and vertical acceleration effect on the stability of the slope with reinforced soil wall is analyzed. The comparison is made with the pseudo-static method. The results has shown that the pseudo- static method may give a conservative design for reinforced soil wall, it may cause unnecessary waste and not eco- nomically.

关 键 词：地震 加筋土挡墙 拟动力法 屈服加速度 永久位移 

分 类 号：TU43[建筑科学—岩土工程] X43[建筑科学—土工工程]