土工织物加筋黏性土坡坡顶加载的离心模型试验研究  

Centrifuge modeling of geotextile-reinforced cohesive soil slopes under surface loading

作　　者：胡耘[1] 张嘎[1] 刘文星[1] 李焯芬[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《岩土力学》2011年第5期1327-1332,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50979045);973基础研究课题(No.2007CB714108)

摘　　要：土工织物加筋技术在工程中得到了广泛的应用,取得了良好的加固效果。但对于土工织物加筋机制尚缺乏明确和统一地认识,加筋理论研究落后于工程实践。为此,进行了坡顶加载条件下土工织物加固黏性土坡和素土边坡的离心模型试验,记录和再现了素土边坡和加筋土坡在坡顶加载条件下的变形破坏过程。主要基于变形分析探讨了黏性土坡在土工织物简单加固条件下的加固效果和加筋机制。结果表明,土工织物加筋可以有效地提高黏性土坡的极限承载力,加筋带的存在改变了土体的位移场,扩大了坡顶加载的影响区域,加筋后滑裂面明显后移。加筋带对土体的局部作用和作用范围,随着土体变形的增大而增大和扩展。Although geotextile reinforcement has been widely used in geotechnical engineering,the reinforcement mechanism is still unclear.Centrifuge model tests are conducted on the geotextile-reinforced and unreinforced cohesive soil slopes under surface loading respectively.The displacement histories of the slopes are measured using an image-analysis system.The reinforcement effect is studied;and the reinforcement mechanism is investigated.The results show that the ultimate bearing capacity of slope could be significant increased by geotextile-reinforcement.Under the action of reinforcement,the deformation field is changed;the influence zone of surface loading is extended;and the slide surface is backwards moved.The local effect and its effective zone increase and extend with the increasing of the deformation of slope.

关 键 词：土工织物 加固 边坡 坡顶加载 离心模型试验 

分 类 号：TU457[建筑科学—岩土工程]