土工格室加筋砂土大型叠环式剪切试验研究  

Study on large-scale laminated ring shear test of geocell reinforced sand

作　　者：李丹[1] 董建刚 胡波[2] 李波[2] LI Dan;DONG Jiangang;HU Bo;LI Bo(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Key Laboratory of Geomechanics and Geotechnical Engineering of MWR,Changjiang River Academy of Sciences,Wuhan 430010,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《人民长江》2023年第12期211-217,共7页Yangtze River

基　　金：安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20191031216)。

摘　　要：为了研究土工格室在不同法向应力下的筋土界面剪切特性,采用DW1280L电液伺服直剪拉拔试验系统开展了大型叠环式剪切试验,分析不同剪切条件下剪切应力、轴向位移变化、叠环水平位移大小及土工格室应力应变规律,并对加筋效果进行对比分析。研究表明:剪切过程中土体形态先剪缩后剪胀直至趋于稳定,且轴向位移与法向应力呈负相关;筋-土界面的剪切带远小于剪切影响范围,且土工格室-砂土界面加筋影响范围更广;在剪切试验中,靠近水平加载位置的土工格室承担荷载时先发挥加筋作用,随着剪切试验的进行其他位置的加筋效果逐渐发挥。研究结果可为实际工程中的土工格室应用及理论研究提供试验依据。To study the interface shear characteristics between reinforcement material and soil in geocells under different normal stresses,a large-scale laminated ring shear test was carried out by using the DW1280 L electro-hydraulic servo direct shear pull-out test system.The shear stress,axial displacement,horizontal displacement of the laminated ring and the stress-strain law of the geocell under different shear conditions were analyzed,and the reinforcement effect was compared and analyzed.The results show that during the shearing process,the soil morphology first shrank and then expanded until it tended to be stable,and the axial displacement negatively correlated with the normal stress.The shear band of the reinforcement material-soil interface was much smaller than the shear influence range,and the influence range of the geocell-sand interface was wider.During the shear test,the reinforcement effect of the geocell near the horizontal loading position worked first,and the reinforcement effect of other positions gradually worked.The research results can provide an experimental basis for the application and theoretical research of geocells in practical engineering.

关 键 词：土工格室 抗剪强度指标 剪胀性 加筋影响范围 叠环式剪切试验 

分 类 号：TU472[建筑科学—结构工程]