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含水率对土工格栅加筋膨胀土结构的运行具有直接影响,而国内外对其作用机制少有研究。为此,采用填土尺寸为600mm×600mm×600mm的大型叠环式剪切仪进行一系列拉拔试验,研究了含水率对土工格栅与膨胀土界面拉拔性状的影响。试验结果表明,含水率对拉拔力与土工格栅位移特征、界面应力变形特征、界面强度参数等具有显著影响。含水率较高,土工格栅发生刚体平动的时间较早,刚体平动时的单宽拉拔力更接近峰值,界面更偏于理想刚塑性特征;含水率较低,界面似黏聚力较大;而含水率对界面似摩擦角的影响不显著。
Moisture content of geogrid reinforced expansive soil structure has a direct impact on the operation, and its mechanism of action at home and abroad few studies. For this reason, a series of drawing tests were carried out by using a large overlap ring shearer whose size was 600 mm × 600 mm × 600 mm. The influence of water content on the interface pull-out behavior between geogrid and expansive soil was studied. The test results show that the moisture content has a significant effect on the pullout force and geogrid displacement characteristics, interface stress and deformation characteristics, interface strength parameters. Moisture content is higher, geogrid rigid body translation occurs earlier, the rigid body translational single-wide pulling force closer to the peak, the interface is more partial to the ideal rigid plastic characteristics; lower water content, the interface cohesion Larger; however, the influence of moisture content on interface-like friction angle is not significant.