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对土工格栅与压实膨胀土的界面特性进行拉拔试验,筋材为高密度聚乙烯(HDPE)单向土工格栅,填土为南水北调中线工程新乡段的膨胀性泥灰岩风化土。结果表明:上覆荷载较大时,土工格栅的变形较明显,格栅刚体平动时的拉拔力更接近峰值,界面摩阻力的分布非均匀,且其均匀程度随拉拔力变化。较小上覆荷载下,峰值拉拔力时土工格栅刚体平动占筋土相对位移的比例较大,界面摩阻力分布较均匀。当界面摩阻力非均匀分布,可导致上覆荷载较大而其界面平均摩阻力反而较小。筋土相对位移1cm―2cm范围内,界面一般可达峰值强度,界面强度曲线可表达为线性函数。
The interface characteristics of geogrid and compacted expansive soil were tested by pullout test. The reinforcement material was HDPE unidirectional geogrid, and the filling was the expansive marl weathered soil in Xinxiang section of the mid-south water transfer project. The results show that the deformation of the geogrid is more obvious when the overburden load is larger, the pulling force of the rigid body is closer to the peak value, and the distribution of the friction force is not uniform, and the uniformity of the geogrid varies with the pulling force. Under the small overburden load, the ratio of the relative displacements of the geogrid rigid body translation geogrid to the peak displacements is larger and the interface frictional resistance distribution is more uniform. When the frictional resistance of the interface is unevenly distributed, the overburden may be larger and the average frictional resistance of the interface may be smaller. In the range of 1cm-2cm, the interface can reach the peak strength, and the interface strength curve can be expressed as a linear function.