基于极限状态内力分析的台阶式加筋土高挡墙内部稳定性设计方法  

Design method for internal stability of multi-tiered geosynthetic-reinforced retaining walls based on limit state

作　　者：张飞[1,2] 陆晓义 贾世林 舒爽 高玉峰[1,2] ZHANG Fei;LU Xiaoyi;JIA Shilin;SHU Shuang;GAO Yufeng(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)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210024

出　　处：《岩土工程学报》2023年第12期2481-2489,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52322808,52078185)。

摘　　要：分级台阶设计常用于加筋土高挡墙中,目前相关设计方法滞后于实际工程。基于极限平衡法建立了台阶式加筋挡墙的筋材内力计算方法,用于确定极限状态下筋材内力分布,从而提出了台阶式加筋挡墙内部稳定性设计方法。从安全设计所需的筋材强度和筋材长度两个方面开展参数分析,揭示了台阶宽度、分级级数、分级挡墙高度等因素对挡墙内部稳定设计结果的影响规律。分析结果表明:稳定所需的筋材强度和长度随台阶宽度增加而减小,超过台阶临界宽度后筋材强度不变,直到各级挡墙完全独立筋材长度不变;台阶总宽度固定时,相比简单的放坡方式,台阶分级可以显著减小筋材强度和长度,宽度较大时双级挡墙筋材用量最少;上级挡墙高度稍大于总墙高一半时,双级挡墙稳定所需筋材强度和长度最小。The multi-tiered configuration is often used in the geosynthetic-reinforced soil(GRS)high retaining walls.However,the related design methods are currently lagging behind the engineering practice.The analytical approach to calculate the reinforcement loads of GRS retaining walls is established based on the limit equilibrium method,which is used to determine the load distribution of reinforcement in the limit state,and thus the design method for internal stability of multi-tiered GRS retaining walls is proposed.The parameter analysis is carried out in terms of the reinforcement strength and the reinforcement length required for safe design,and the influences of factors such as offset distance,tier number and height of each tier on the internal stability of retaining walls are revealed.The obtained results show that the required strength and length of reinforcement decrease with the increase of the offset distance,and the required reinforcement strength remains unchanged after exceeding the critical offset distance until the reinforcement length of each tier is completely independent.If the total offset distance is constant,the multi-tiered configuration will significantly reduce the reinforcement strength and length compared with the simple step-slope method.In this situation,the two-tiered configuration yields the least length of reinforcement when the offset distance is large.When the upper wall height is slightly higher than half of the total wall height,the required strength and length of the reinforcement in the two-tiered retaining wall are the smallest.

关 键 词：挡墙 加筋土 极限平衡 稳定性分析 台阶 

分 类 号：TU43[建筑科学—岩土工程]