【作者】 姚爱军； 杨晓； 李浩波； 雷刚； 张海明；

【Author】 Yao Aijun;Yang Xiao;Li Haobo;Lei Gang;Zhang Haiming;The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology;

【机构】 北京工业大学城市与重大工程安全减灾共建重点实验室；

【摘要】 土工布作为一种实用建筑材料已经广泛应用于公路路堤、地基处理和挡土墙等各类工程中,而土工布与填土间的界面作用特性直接影响加筋土结构的安全与稳定。通过大型直剪试验对北京地区粉土-土工布界面摩擦特性进行了分析,分别考虑了不同法向应力、含水率和剪切速率对其界面摩阻力的影响,并得出其界面粘聚力和界面内摩擦角随含水率和剪切速率的变化规律。试验结果表明:随着含水量的增加,粉土-土工布界面峰值强度逐渐降低;粘聚力呈现先增加后减小;内摩擦角逐渐剑桥减小;剪切速率在一定范围内对土工布筋土界面作用的影响不大,不同剪切速率相同法向应力作用下的峰值强度相差不大;剪切速率对界面强度参数的影响较小。更多还原

【Abstract】 The interface interaction of geotechnical fabric,a new type material wildly used in highway embankment、foundation treatment、retaining wall and other kind of projects,and back fills had direct effects to the stability and safety of reinforced soil structure.Analysis of interface friction of silt—Beijing area—and geotechnical fabric by large direct shear test,considering the effects of different normal stress、 moisture content and shear rate,showed the variation of interface cohesion and internal friction angle as the moisture content and shear rate changed.It showed that the peak strength of interface of silt- geotechnical fabric gradually decreased as the moisture content increased in the same load.The interface cohesion firstly increased and then decreased,but the internal friction angle put the other way round.There existed low effects of silt-geotechnical fabric strength by the changing of shear rate.更多还原