| 摘要: |
| 通过室内格栅横、纵肋独立拉拔试验,针对不同的法向荷载和拉拔速度，分别对土工格栅横肋与纵肋的加筋机理进行了研究.结果表明：格栅纵肋所产生的摩擦阻力在拉拔初期迅速增大，并且随着有效应力的增大呈线性增长趋势，拉拔速率对其影响并不大；格栅横肋所产生的被动阻力增长相对较缓，在达到最大值之前需要一定的筋土相对位移,并且随着有效应力和拉拔速率的增大，被动阻力变化明显，其破坏模式逐渐由冲剪破坏转为常规剪切破坏. |
| 关键词: 土工格栅 拉拔试验 加筋机理 拉拔力 |
| DOI：10.3969/j.issn.1007 9629.2013.03.031 |
| 分类号: |
| 基金项目: |
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| Reinforcement Mechanism of Transverse and Longitudinal Geogrid Ribs |
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CHEN Rong1, HAO Dong xue1, LUAN Mao tian2, ZHAO Wei2
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1.School of Civil and Architecture Engineering, Northeast Dianli University, Jilin 132012, China;2.School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116085, China
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| Abstract: |
| A series of experiments to investigate the reinforced mechanism of transverse and longitudinal ribs were conducted with newly developed individual rib pullout devices under various normal load and pullout velocity. By analyzing experimental data, some conclusions are made that the frictional resistance of longitudinal ribs rapidly increases in early time of the pullout test, which is enhanced with the increase of effective stress but not with pullout velocity. However, passive resistance generated by transverse ribs increases more slowly than frictional resistance, and certain displacement is necessary to reach its maximum. With the increase of effective stress and pullout velocity, the failure mechanism of passive resistance is changed from the punching failure mechanism to general shear failure mechanism. |
| Key words: geogrids pullout test reinforced mechanism pullout force |
