土木与环境工程学报（中英文）2024，Vol.46Issue(4)：29-38,10.DOI:10.11835/j.issn.2096-6717.2022.011
加筋土结构筋-土界面特性和筋材位移变化规律试验研究
Experimental study on interface properties between geogrids and sand and reinforcement displacement distribution of reinforced soil structures based on pullout tests
摘要
Abstract
Based on pullout tests,the effect of normal stress,compaction degree as well as water content of backfills on interaction mechanism of reinforcement-soil interface and reinforcement displacement were investigated and the evolving pattem of reinforcement displacement was analyzed.The results showed that geogrid displacements along the full-length obviously lagged behind the displacement at loading end,and with increase of distance away from loading end,the geogrids displacements tended to decrease nonlinearly.An increase in normal stress,compaction degree or water content caused to the decrease in geogrid displacement for the identical pullout force and the same measured points.Moreover,the farther the location of measured points is,the weaker the effect of above-mentioned factors on geogrids displacements.During the pullout tests,the main failure modes included the geogrid pulled out fully and breakup failure of geogrid,and the peak pullout forces were approximately linear with the displacement at loading end.The peak pullout forces were closely related with the normal stress,compaction degree,water content or pullout rate.To increase compaction degree or water content of backfills,which caused to enhance interface interaction of reinforcement and soil,contributed somewhat the increase of friction angle of reinforcement-soil interface made the apparent cohesion of interface to increase remarkably,and the apparent cohesion of reinforcement-soil interface reached the greater value when the water content of backfills equals to the optimum water content.The test results showed that it is necessary to strictly control the water content of the backfill soil,and allowing the reinforced structure to deform properly is conducive to playing the role of reinforcement.关键词
土工格栅/位移分布/筋土界面/拉拔试验/拉拔力Key words
geogrids/displacement distribution/reinforcement-soil interface/pullout test/pullout force分类
建筑与水利引用本文复制引用
肖成志,路遥,郑鸿,王清洲..加筋土结构筋-土界面特性和筋材位移变化规律试验研究[J].土木与环境工程学报（中英文）,2024,46(4):29-38,10.基金项目
国家自然科学基金(52078182、41877255) （52078182、41877255）
天津市自然科学基金(20JCYBJC00630) National Natural Science Foundation of China(No.52078182,41877255) （20JCYBJC00630）
Natual Science Foundation of Tianjin(No.20JCYBJC00630) （No.20JCYBJC00630）
