网格状带齿加筋的拉拔特性  

Pull-out Test on Interface Characteristics of Grid Reinforcement of Denti-inclusions

作　　者：赵岗飞[1] 张孟喜[1] 蔡春[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《上海大学学报（自然科学版）》2011年第6期785-791,共7页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(40972192);上海市教委科研创新重点资助项目(11ZZ88)

摘　　要：在水平-竖向(horizontal-vertical,H-V)加筋体系基础上,提出网格状带齿加筋,并对网格状带齿有机玻璃材料进行拉拔试验研究.首先,对有机玻璃材料进行孔洞设置,并在合适的地方通过布置一定的齿筋来构成立体加筋材料;然后,对不同孔洞、不同齿筋高度的网格状带齿有机玻璃材料在多种法向应力情况下进行拉拔试验.试验结果表明,在相同法向应力作用下,网格状带齿有机玻璃材料加筋的拉拔力明显高于水平网格状有机玻璃材料.探讨了孔洞大小和齿筋高度对网格状带齿有机玻璃材料的极限拉拔阻力的重要影响.进一步研究了筋土界面的摩擦特性,建立了理论计算公式,并将试验结果与计算值进行了对比,发现二者基本吻合.A new soil reinforcement method using mesh with teeth is proposed based on horizontal-vertical （H-V） reinforcement. First, holes and vertical bars are set on the perspex material to constitute a threedimensional reinforcement material. A series of pull-out tests of perspex with holes geosynthetics are performed to investigate the interface behavior between sand and perspex with hole inclusions in terms of different forms of reinforcements. The impact of tooth height and hole size of reinforcement for ultimate pull-out resistance is discussed. Test results show that the up-limited pull-out force of perspex with teeth is significantly larger than the ordinary ones in the same normal stress. The up-limited pull-out resistance increases with the tooth height, and is significantly influenced by the hole size. Coefficient of apparent pull-out friction is evaluated. A theoretical formula is proposed to determine the pullout resistance. The theoretical values and experimental results are in good agreement.

关 键 词：水平-竖向(horizontal—vertical H.V)加筋土 网格状带齿加筋 拉拔试验 极限拉拔阻力 

分 类 号：TU441[建筑科学—岩土工程]