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

作　　者：方薇[1] 周鹏 王骄 沈洪宇 FANG Wei;ZHOU Peng;WANG Jiao;SHEN Hongyu(School of Traffic Transportation of Engineering,Changsha University of Science&Technology,Changsha 410114,China;Changsha Ligong Detection and Consulting Co.,Ltd.,Changsha 410076,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410114 [2]长沙理工检测咨询有限公司,长沙410076

出　　处：《工业建筑》2024年第5期205-211,共7页Industrial Construction

基　　金：国家自然科学基金项目(51408059,52178413);湖南省自然科学基金项目(2022JJ30593)。

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。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 constructed by fixing aluminum angles as vertical stiffener ribs on the top of the transverse ribs of plastic geogrids.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,friction-like coefficient,and pullout coefficient of plastic geogrids with vertical ribs of aluminum angles increased 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 improve the pullout rasistance strength of the reinforced soil complex,and had positive significance for improving the stability of soil.

关 键 词：道路工程 加筋土 拉拔试验 带齿塑料格栅 

分 类 号：U414[交通运输工程—道路与铁道工程]