一种土工合成材料加筋土界面拉拔行为分析∗

为研究试验过程中不同位置的筋土界面拉拔行为,以补充试验测量的不足,提出了一个能够预测筋材任意位置拉力和位移的界面拉拔公式,并给出了其具体的应用和分析步骤。首先预测给定筋材长度的最大峰值拉力,然后在最大峰值拉力范围内预测给定峰值拉力的筋材有效长度,其次确定界面摩擦系数大小,最后预测沿筋材任意位置的位移变化关系。同时,对界面拉拔公式进行了参数影响分析,并将界面拉拔公式预测结果与试验结果进行对比。研究结果表明:界面摩擦系数可以间接验证界面拉拔公式的准确性,对拉拔试验结果提供一致性解释。界面拉拔公式的预测结果与拉拔试验结果吻合良好,表明了分析模型的合理性。研究成果对分析和完善筋土界面特性具有重要意义。

An Interface Pull-out Behavior Analysis of Geosynthetics Reinforced Soil

To study the pull-out behavior of the reinforcement-soil interface at different locations in the test process and to compensate for the shortcoming of test measurements,an interface pull-out formula is proposed to predict the tension and displacement at any position of the reinforcement.The detailed application and analysis steps of the interface pull-out formula were given.First,the maximum peak tension of the reinforcement with a given length is predicted,and then the effective length of the reinforcement with a given peak tensile force is predicted within the maximum peak tensile force range.After that,the interface friction coefficient is determined,and finally the displacement at any position of the reinforcement is predicted.Meanwhile,a parametric study on the interface pull-out formula is conducted,and the predicted results of interface pull-out formula are compared with experimental results.The results show that the interface friction coefficient can indirectly verify the accuracy of the interface pull-out formula and provide a consistent explanation for the test results.The predicted results of the interface pull-out formula are in good agreement with test results,which indicates the rationality of the analytical model.The research results are of great significance to the analysis of the interface characteristics between a reinforcement and soil.