低超载下条带式带齿加筋界面特性

在提出立体加筋的基础上,对条带式带齿加筋砂土进行了低超载下大量的拉拔试验来研究筋土的界面特性,分析了带齿筋的条带式加筋对拉拔性能的影响,探讨了不同上层覆压下筋条的拉拔力与水平位移的关系以及似摩擦系数f*的变化规律。在试验成果分析的基础上,分析了条带式带齿加筋与砂土的相互作用机理,建立了条带式带齿加筋砂土的拉拔力模型。并将试验结果与理论值比较,二者基本吻合。

Behavior of interface between denti-strip geosynthetic reinforcements and soil under low surcharge

In conventional reinforced soil,the reinforcements are often horizontally laid in the soil.A new concept of soil reinforced with denti-strip geosynthetics was proposed.In the proposed denti-strip reinforced soil,besides the conventional horizontal reinforcements,some vertical reinforcing elements were also placed upon the horizontal ones.A series of pullout tests under low surcharge of denti-strip geosynthetics(e.g.,plexiglass,) were performed to investigate the interface behavior between sand and denti-strip inclusions in terms of different forms of reinforcements.Comparison was made between surcharge-displacement relationship and pullout resistances of the soil reinforced with horizontal inclusions and with denti-strip.The influences of the height,horizontal space of vertical reinforcing elements on the interface behavior between sand and denti-strip inclusions were discussed.From the test results,the coefficient of apparent pullout friction was evaluated.The interaction mechanism between sand and denti-strip was analyzed,and a new theoretical model was proposed to determine the pullout resistance.The comparison between theoretical values and experimental results was in good agreement.