基于准粘聚力理论的加筋土挡墙土压力分析  

Analysis of lateral soil pressures for reinforced earth retaining wall based on quasi-cohesive concept

作　　者：周亦涛[1] 薛晓辉[2] 梁小勇[3] 苗正伟[1] 崔伟敏[1] 

机构地区：[1]河北工程技术高等专科学校,河北沧州061001 [2]陕西铁路工程职业技术学院建筑工程系,陕西渭南714000 [3]河北科技大学建筑工程学院,河北石家庄500183

出　　处：《黑龙江工程学院学报》2010年第1期30-32,42,共4页Journal of Heilongjiang Institute of Technology

摘　　要：考虑拉筋存在的影响,对不同破坏形式下的加筋土强度理论进行探讨,应用准粘聚力理论,提出两种不同破坏形式的加筋土挡墙墙背土压力计算公式。研究结果表明:拉断破坏下的加筋土粘聚力具有增量;粘着破坏下的加筋土内摩擦角具有增量;所提出的加筋土挡墙墙背侧向土压力比经典土压力和变系数法都小;不管是拉断破坏,还是粘着破坏,加筋土挡墙侧向土压力都随拉筋垂直间距增加而增加;拉断破坏下,加筋土挡墙侧向土压力随拉筋抗拉强度增加而减小;与土工格栅加筋土挡墙试验数据基本一致,粘着破坏法比实测值大。Considering the effect of reinforcement, this paper discusses strength of reinforced earth for different failure modes. And then, based on the quasi cohesive concept, theoretical formulae of lateral soil pressure for reinforced earth retaining wall are obtained for two failure modes. Analytical results show： cohesive force of reinforced earth has increment for the tensile failure, angle of internal friction has increment for the adhesion failure; lateral soil pressures value using proposed formula are smaller than using classical earth pressure theories and variational coefficient method of earth pressure, and will increase with increasing of the vertical spacing of the reinforcement, for tensile failure and adhesion failure; active lateral soil pressures by the proposed formula for tensile failure will decrease with increasing of the tensile strength of the reinforcement. The calculating results by this paper＇s method basically accord with results of the site tests in geogrid reinforced earth retaining wall, and theoretical values for adhesion failure are bigger than tested values.

关 键 词：准粘聚力理论 侧向土压力 加筋土挡墙 竖向间距 拉断破坏 粘着破坏 

分 类 号：TU476.4[建筑科学—结构工程]