土工格栅与粗粒土界面作用特性的直剪试验研究

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。

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

In construction of expressways in mountainous areas,the subgrade 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 ...