带齿塑料土工格栅拉拔试验研究
Study of Pullout Tests on Plastic Geogrids with Vertical Stiffener Ribs of Aluminum Angles
方薇 1周鹏 1王骄 2沈洪宇1
作者信息
- 1. 长沙理工大学交通运输工程学院,长沙 410114
- 2. 长沙理工大学交通运输工程学院,长沙 410114;长沙理工检测咨询有限公司,长沙 410076
- 折叠
摘要
为提升普通塑料土工格栅与填料之间的界面强度,在格栅横肋上部固定角铝作为齿筋,构造一种新型立体筋材——带齿塑料格栅.通过开展不同组合工况下带齿塑料格栅室内拉拔试验,探索其在砂土填料中的抗拔特性及其参数特征.研究结果表明:1)法向应力较低时,拉拔曲线出现明显峰值,在考察范围内表现为应变软化特征;2)随着法向应力的增大,带齿塑料格栅极限拉拔力明显增大.同一法向应力下,极限拉拔阻力与齿筋高度近似呈线性正相关;3)带齿塑料格栅的加筋效果系数、界面抗剪强度参数、似摩擦系数、拉拔系数均随着齿筋高度的增大而增大,表明含有齿筋的三维立体筋材可以切实有效地提高加筋土复合体的抗拔强度,对改善土体稳定性具有积极意义.
Abstract
To improve the interfacal strength between ordinary plastic geogrids and fillers,a new type of three-dimensional reinforcement materials—plastic geogrids with vertical ribs of aluminum angles was con-structed by fixing aluminum angles as vertical stiffener ribs on the top of the transverse ribs of plastic geo-grids.The pullout resistance characteristics and their parameter features of plastic geogrids with vertical stiffener ribs of aluminum angles in sandy fillers were explored by indoor pullout tests in different combined working cases.The results indicated that:1)the pullout curves had an obvious peak value in the stage of lower normal compressive stress,which were characterized by strain softening within the observed range;2)with the increase in normal compressive stress,the ultimate pullout resistance of plastic geogrids with vertical stiffener ribs of aluminum angles increased obviously.Under the same normal stress,the ultimate pullout resistance was approximately linearly and positively correlated with the height of the vertical stiffener ribs of aluminum angles.3)The reinforcement effect coefficient,interface shear strength parameter,fric-tion-like coefficient,and pullout coefficient of plastic geogrids with vertical ribs of aluminum angles in-creased with the increase in the height of the vertical stiffener ribs of aluminum angles,which indicated that three-dimensional reinforcement materials with vertical stiffener ribs of aluminum angles could effectively im-prove the pullout rasistance strength of the reinforced soil complex,and had positive significance for impro-ving the stability of soil.
关键词
道路工程/加筋土/拉拔试验/带齿塑料格栅Key words
road engineering/reinforced soil/pullout test/plastic geogrid with vertical stiffener rib of alu-minum angles引用本文复制引用
基金项目
国家自然科学基金(51408059)
国家自然科学基金(52178413)
湖南省自然科学基金(2022JJ30593)
出版年
2024
NETL
NSTL
万方数据