摘要
重力式加筋土挡墙在结构上既通过加筋约束墙后填土侧向形变,又要求刚性墙面承担墙后土压力,其墙后土压力不能采用传统柔性面加筋土挡墙土压力计算方法,而目前尚缺乏对其设计原理和工作性能的充分研究,理论落后于实践。本文基于加筋土的似粘聚力理论和工作应力原理,假设筋材的抗拉强度、筋土复合体的粘聚力有相同的随位移变化关系,根据加筋土应力摩尔圆几何关系,考虑筋土复合体中筋材强度折减,推导筋土复合体粘聚力、不同埋深筋材的拉力随墙面位移变化的计算方法;根据朗肯、库伦土压力理论的适用条件,推导出适用于挡墙3种基础位移模式的似粘聚力法和工作应力原理法两种土压力计算方法,并设计计算模型进行结果对比分析,表明2种计算方法结果的区别在于似粘聚力发挥值与筋材抗拉强度发挥值引起的拉力区有不同。本文提出的2种计算方法对不同加筋强度和压力状态下的重力式加筋土挡墙土压力计算有一定的理论意义,对该结构的实际应用也有相应的指导价值。
The gravity reinforced earth retaining wall not only restricts the lateral deformation of the backfill behind the wall by reinforcement,but also requires the rigid wall to bear the earth pressure behind the wall.The earth pressure behind the wall cannot be calculated by the traditional calculation method of the earth pressure of the reinforced earth retaining wall with flexible surface.At present,China lacks research on its design principle and working performance,and the theory lags behind practice.Based on the quasi-cohesion theory and working stress principle of reinforced soil,it is assumed that the tensile strength of reinforced material and the cohesion of reinforced soil composite have the same relationship with displacement.According to the geometric relationship of stress Mohr circle of reinforced soil and considering the strength reduction of reinforced material in reinforced soil composite,the calculation method of the cohesion of reinforced soil composite and the tensile force of reinforced material with wall displacement at different depths is deduced.According to the applicable conditions of Rankine's and Coulomb's earth pressure theory,two kinds of earth pressure calculation methods are deduced,which are similar cohesion method and working stress principle method,suitable for three kinds of foundation displacement modes of retaining wall.The results of the two calculation models are compared and analyzed.The difference between the results of the two calculation methods is that the tensile zone caused by the quasi-cohesive force and the tensile strength of the reinforcement.The two calculation methods have certain theoretical significance for the earth pressure calculation of gravity reinforced earth retaining wall under different reinforcement strength and pressure state,and have corresponding guiding value for the practical application of the structure.
作者
杜浩源
宋玲
刘杰
白奇玉
DU Haoyuan;SONG Ling;LIU Jie;BAI Qiyu(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi,Xinjiang 832003,China;Xinjiang Transportation Planning,Survey and Design Institute Co.Ltd,Urumqi,Xinjiang 830000,China)
出处
《石河子大学学报（自然科学版）》
CAS
北大核心
2023年第3期291-297,共7页
Journal of Shihezi University(Natural Science)
基金
国家自然科学基金(51669031)
新疆交通设计院科研基金(KY2019092504)。
关键词
重力式加筋土挡墙
似粘聚力
工作应力原理
非极限状态
土压力
gravity reinforced earth retaining wall
quasi cohesion
working stress principle
non limit state
soil pressure
