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在传统双向土工格栅的节点上设置一定厚度的加强节点,以形成具有立体加筋效果的带加强节点土工格栅。通过室内拉拔试验,研究了带加强节点土工格栅筋-土界面作用特性,探讨了横肋间距和加强节点厚度对极限拉拔阻力的影响。结果表明,拉拔曲线在法向应力较小时出现峰值,法向应力较大时表现出应变硬化的特征。带加强节点土工格栅的极限拉拔阻力较传统土工格栅都有一定程度的提高,且随着横肋间距的增大而减小,随着加强节点厚度的增加而线性增大。基于试验结果分析极限拉拔阻力的组成发现,随着横肋间距的增大,极限拉拔阻力的主导作用力由横肋极限端承阻力转变为筋-土界面间的极限摩阻力。
In the traditional bi-directional geogrid set a certain thickness of the nodes to strengthen the node to form a three-dimensional reinforced with a reinforced geogrid node. Through the indoor pullout test, the interaction characteristics of the geogrid-soil interface with the strengthened node are studied, and the influence of the inter-rib spacing and the strength of the strengthened node on the ultimate pullout resistance is discussed. The results show that the pull-out curve shows a peak value when the normal stress is small, and shows a strain-hardening characteristic when the normal stress is large. Compared with the traditional geogrid, the ultimate drawing resistance of the geogrid with reinforcing node increases to a certain extent, and decreases with the increase of the distance between the transverse ribs, and increases linearly with the increase of the thickness of the node. Based on the test results, the composition of the ultimate pullout resistance was analyzed. It was found that with the increase of the transverse rib spacing, the dominant force of the ultimate pullout resistance was changed from the ultimate end resistance of the transverse rib to the ultimate frictional resistance between the tendon and soil interface.