土工格栅与粗粒土界面作用特性的直剪试验研究  

Direct Shear Test Research on Acting Characteristics of Geogrid and Coarse Grained Soil Interface

作　　者：严秋荣[1] 邓昌中[2] 邓卫东[1] 

机构地区：[1]重庆交通科研设计院,重庆400067 [2]四川成南高速公路有限责任公司,成都610052

出　　处：《公路交通技术》2008年第4期1-4,共4页Technology of Highway and Transport

基　　金：交通部西部交通建设科技项目(200431882206)

摘　　要：山区高速公路建设中,常采用单向、双向拉伸土工格栅作为筋材进行路基加筋,路基填料多为移挖作填的粗粒土。以此为背景,采用大型直剪试验方法,就影响筋土界面特性的几个主要因素(压实度、含水量、土工格栅孔径、粗粒土粒径)进行试验研究。通过研究得到:界面摩擦角随着填土压实度增加而增加,随着填土含水量的增加降低幅度逐渐增大;界面摩擦角与土工格栅孔径有一定的匹配关系,存在一个最佳孔径;界面摩擦系数比呈现出随填料中粗颗粒P5含量增加而增大的趋势。In construction of expressways in mountainous areas, the subgTade is usually reinforced by means of uni- directionally and bidirectionally stretched geogrid as reinforcing materials, and the subgrade fillings mostly adopt trans- excavated coarse grained soil. As per this background, a large - scale direct shear test method is applied for test research on characteristics of reinforcement and soil interface against a few major factors such as compaction densities, water contents, geogrid apertures, grain size of coarse grained soil. As a result of the research, the interface friction angles increase with the increase of compaction densities of backfilling soil and its decreasing amplitudes gradually enlarge with the increase of water contents in backfilling soil. The interface friction angles have a certain matching relation with the apertures of geogrids and there is an optimal aperture. The interface friction coefficient ratio presents a tendency of increase with the increase of coarse grain P5 content in fillings.

关 键 词：土工格栅 直剪试验 筋土界面 

分 类 号：U416.21[交通运输工程—道路与铁道工程]