考虑墙趾阻力的加筋土挡墙的数值分析与筋材拉力计算方法  

Numerical Analysis and Calculation Method for Reinforcement Loads in Reinforced Soil Retaining Walls Considering Toe Resistance

作　　者：张琬 陈建峰[2] 孙蕊 薛一峰[3] 葛佳西 赵玮[3] ZHANG Wan;CHEN Jianfeng;SUN Rui;XUE Yifeng;GE Jiaxi;ZHAO Wei(School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,Shaanxi,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,Hydropower Engineering Branch,Xi'an 710001,Shaanxi,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]同济大学土木工程学院,上海200092 [3]陕西省水利电力勘测设计研究院水电工程分院,陕西西安710001

出　　处：《力学季刊》2023年第4期956-966,共11页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(42007264,41772289);陕西省自然科学基础研究计划(2023-JC-QN-0630)。

摘　　要：现行加筋土挡墙设计规范由于忽略了墙趾阻力对挡墙内部稳定性的贡献,计算的筋材拉力值远大于实测值,在设计上过于保守.本文对55座假定的模块式加筋土挡墙开展数值模拟,研究工作应力条件下筋材最大拉力随墙趾阻力的变化规律及其影响因素,在此基础上,采用响应面模型提出考虑墙趾阻力的筋材拉力计算方法,并用现场挡墙实测数据对该方法进行验证.结果表明,随着墙趾阻力增大,挡墙下部1/3高度范围内的筋材最大拉力值减小;墙趾阻力对筋材拉力的影响随着挡墙高度和填土内摩擦角的增加而减弱,随墙面仰角的增加而增强,受筋材刚度和间距影响不大;本文提出的方法可以合理预测加筋土挡墙在工作应力状态下的筋材拉力,并能反映出墙趾阻力使挡墙底部筋材拉力减小的现象.Current design method of reinforced soil retaining walls seriously overestimates the reinforcement loads compared to the measured values,due to the ignorance of the contribution of toe resistance to the internal stability of wall.Numerical simulations were conducted on 55 hypothetical reinforced segmental walls to study the variation of the maximum reinforcement loads with the toe resistance under the working stress condition and its influencing factors.Furthermore,a calculation method for the reinforcement loads considering toe resistance was proposed using the response surface model,and was validated using the measured data of field walls.The results show that the increase of toe resistance leads to the decrease in the maximum loads of reinforcement layers within the bottom 1/3 height of wall.The effect of toe resistance on the reinforcement loads decreases with the increase of wall height and internal friction angle of backfill,and increases with the increase of the facing batter,while is little influenced by the stiffness and spacing of the reinforcement layers.The method proposed in this paper can reasonably predict the reinforcement loads of reinforced soil walls under the working stress condition,and can reflect the trend that the toe resistance reduces the reinforcement loads in the bottom of wall.

关 键 词：加筋土挡墙 筋材拉力 墙趾阻力 响应面 数值模拟 

分 类 号：TU441[建筑科学—岩土工程]