桩承式加筋路堤三角形布桩下的荷载传递机理
Load Transfer Mechanism of Reinforced Embankment with Triangular Array of Piles
王亚东 1陈超骏 1刘小三 1刘齐建 2邓涛 3陆宸羽 2林聪煜2
作者信息
- 1. 中电建路桥集团有限公司,北京 100160
- 2. 湖南大学土木工程学院,长沙 410082
- 3. 福州大学土木工程学院,福州 350108
- 折叠
摘要
为探究三角形布桩下桩承式加筋路堤的荷载传递效率,将桩帽形状进行合理等效,提出改进同心球拱模型.将圆形或方形桩帽等效为正六边形,相邻桩间条形区域形成二维半圆土拱,三桩间三角形区域上方形成三维半球土拱.考虑土工格栅呈抛物线形弯沉,在地基反力模型中引入固结系数,得到了土与土工格栅之间的摩擦和粘附作用张力表达式,研究了土拱和拉膜效应下桩的荷载传递效率.通过将本文方法与现有解析理论、规范方法进行对比,验证了其合理性和可行性.参数分析表明:荷载传递效率随地基反力系数的增加成指数型降低,随地基固结系数成直线缓慢增加.随着填土高度增加,土拱效应和拉膜效应先增大而后趋于稳定.
Abstract
This paper presents an improved concentric arches model using the equivalence method for pile caps.The load transfer efficiency of geosynthetic-reinforced piled embankments with a triangular arrangement of piles is inves-tigated.The pile cap with circular or square cross-sections is considered equivalent to a regular hexagon.The model is composed of three two-dimensional semicircular soil arches formed over the strip area between adjacent piles.A three-dimensional hemispherical soil arch is developed over the triangular area between three adjacent piles.Consid-ering the geogrid deflects in a parabolic shape and the consolidation coefficient of the soil reaction,the frictional and adhesive tensions between the soil and the geogrid are obtained.The load transfer efficiency of the pile is inves-tigated by considering the effects of the soil arch and the tensile membrane.Comparisons of the present solution re-sults with those from available analytical methods and standards ensure its accuracy and feasibility.Parametric stud-ies show that the load transfer efficiency decreases exponentially with an increase in the subgrade reaction coefficient and increases slightly with an increase in the consolidation coefficient of the soil.The effects of the soil arch and membrane tension increase sharply at first and then become constant as the embankment height increases.
关键词
桩承式加筋路堤/三角形布桩/同心半球土拱/土拱效应/拉膜效应Key words
load-bearing reinforced piled embankment/triangular pile arrangement/concentric spherical soil arc-hing/soil arching effect/membrane effect引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据