摘要
基于极限平衡法提出土工合成材料加筋黏性土挡墙稳定性分析方法,结合筋材前后端筋土界面摩擦特性确定极限状态下挡墙筋材的内力分布和面板-筋材前端连接强度。首先,假设筋材刚度为常量,运用挡墙筋材内力分析方法简化计算加筋土挡墙墙面的侧向变形;其次,将内力分析确定的挡墙最危险滑裂面与已有研究获得的试验和数值结果进行对比,验证该方法的有效性;最后,考虑加筋设计中几个重要参数,如填土抗剪强度指标的黏聚力与内摩擦角、墙面倾角及筋材长度,运用本文提出的方法探究加筋挡墙力学性状与墙面侧向变形的影响规律。研究结果表明:采用黏性土作为加筋挡墙填土可以显著减少挡墙稳定所需的筋材拉力和墙面产生的水平位移,进而缓解墙面可能发生的鼓胀变形问题;挡墙墙面设计一定倾斜角度(约10°)就可以大幅减少挡墙稳定所需的筋材拉力,但是会显著增加挡墙下部的面板与筋材连接强度;增加筋材设计长度可以有效避免挡墙发生滑裂面部分穿过加筋区的复合破坏,并减少筋材拉力和墙面水平变形。
Based on traditional limit equilibrium method,stability analyses of geosynthetic-reinforced soil(GRS)wall in cohesive soil were conducted.The reinforcement tensile load and strength of connection to the facing were determined at limit state.Firstly,assuming the stiffness of the reinforcement is constant,the lateral deformation of GRS wall was estimated using the method of distribution of the reinforcement tensile load.Secondly,compared with the failure surfaces obtained from this study and existing research using experiment and numerical simulations,the accuracy of the presented analyses was validated.Finally,parameter analyses were carried out to investigate the influences of design parameters(i.e.,cohesion and frictional angle of backfill,wall inclination angle and reinforcement length)on the required reinforcement strength and lateral deformation of the GRS wall.The results show that using the cohesive soil as the backfill in GRS wall can obviously reduce the required tensile strength of reinforcement and the horizontal displacement of the wall facing,which could alleviate the wall bulging deformation.Small wall inclination angle(about 10°)can largely decrease the required reinforcement strength,but increase the connection strength of the panel,especially at the lower part of the wall.Increasing the reinforcement length can effectively avoid compound failure due to failure surface through reinforced area incompletely and decrease reinforcement strength and lateral deformation.
作者
张飞
温友鹏
陈延博
贾世林
ZHANG Fei;WEN Youpeng;CHEN Yanbo;JIA Shilin(Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Jiangsu Research Center for Geotechnical Engineering Technology,Hohai University,Nanjing 210024,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第12期4238-4251,共14页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51878248,52078185,41630638)。
关键词
土工合成材料
加筋土
挡墙
极限平衡
筋材内力
geosynthetics
reinforced soil
retaining wall
limit equilibrium
reinforcement load
