含根量对SANDWICH形加筋土界面剪切强度影响--以红叶石楠为例  

Effect of plant root content on interfacial shear strength of SANDWICH reinforced soil——Taking photinia fraseri as an example

作　　者：张涛[1] 梁冠军[1] 尤超 ZHANG Tao;LIANG Guanjun;YOU Chao(School of Architetural Engineering,Chuzhou Polytechnic,Chuzhou 239500,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]滁州职业技术学院建筑工程学院,安徽滁州239500 [2]同济大学土木工程学院,上海200092

出　　处：《佛山科学技术学院学报（自然科学版）》2024年第4期34-40,共7页Journal of Foshan University(Natural Science Edition)

基　　金：安徽省教育厅自然科学重点研究项目(KJ2020A0994,2022AH052650);滁州职业技术学院研究项目(YJY-2021-11)。

摘　　要：SANDWICH形加筋土是一种采用粘土夹砂层以及土工格栅而形成的混合填料形式的加筋土结构。采用一系列直接剪切试验研究含根量、竖向应力等因素对筋土界面强度的影响。试验证明,根系的加入对SANDWICH形加筋土界面最大剪应力有所提升且随着竖向应力的增大,土体抗剪强度增幅大。随着粘土中含根量的增加,筋土界面最大剪应力在不同竖向应力作用下出现先增后减的趋势。根据试验数据,利用拟合软件提出了评价筋土界面剪切强度的经验公式,得出理论上含根量的最优值为4.2%。并通过试验验证了拟合公式的有效性和正确性。The mechanical properties of soil-reinforcement interaction are important for the design and stability analysis.A series of shear tests were performed to investigate the interface behavior of soil against geogrid with the effects of root content,normal stress and other factors.The results indicate that,the maximum shear stress at the interface of sandwich reinforced increase with the addition of root and the shear strength increases more with the increase of normal stress.With the increase of root content in the soil,the maximum shear stress of interface increases at first and then decreases under different normal stress.According to test data,an empirical formula for evaluating the shear strength is proposed by the fitting software,and the optimal theoretical value of root content is 4.2%.The validity and correctness of the fitting formula are verified by experiments.

关 键 词：SANDWICH形加筋土 直剪试验 含根量 剪切强度 

分 类 号：U416[交通运输工程—道路与铁道工程]