| 加肋土工膜与砂土拉拔试验及界面细观分析 |
| |
| 引用本文： | 高俊丽,徐宏飞,曹威,袁川.加肋土工膜与砂土拉拔试验及界面细观分析[J].岩土力学,2019,40(12):4668-4674. |
| |
| 作者姓名： | 高俊丽 徐宏飞 曹威 袁川 |
| |
| 作者单位： | 上海大学 土木工程系，上海 200444 |
| |
| 基金项目： | 国家自然科学基金（No.51208293） |
| |
| 摘 要： | 为了进一步研究加肋土工膜拉拔试验作用机制，通过室内拉拔试验和粒子图像测速(PIV)分析，研究不同工况下（加肋高度和温度）加肋土工膜与砂土界面的力学性质以及衬垫系统内部颗粒的位移场和速度场分布。拉拔试验结果表明，不同的加肋高度和温度对界面的稳定性有着深刻的影响，极限拉拔阻力随着加肋高度的增加和温度的降低而增大。通过细观分析得出加肋土工膜和砂土界面附近砂土会形成间接影响区。影响区内部的砂土位移和速度比周围砂土颗粒位移和速度大，这是因为肋块在拉拔过程中挤压其左侧的颗粒或带动其整体移动。并且肋块之间的影响区会相互影响扩散，因此对砂土颗粒形成加固作用。试验结果和PIV分析表明，温度和加肋高度对间接影响区有着显著的影响，从而对加肋土工膜与砂土界面的整体稳定性产生影响。
|
| 关 键 词： | 加肋土工膜 室内拉拔试验 粒子图像测速(PIV) 位移 速度 |
| 收稿时间： | 2018-10-22 |
Drawing test and mesoscopic analysis of ribbed geomembrane/sandy soil interface |
| |
| GAO Jun-li,XU Hong-fei,CAO Wei,YUAN Chuan.Drawing test and mesoscopic analysis of ribbed geomembrane/sandy soil interface[J].Rock and Soil Mechanics,2019,40(12):4668-4674. |
| |
| Authors: | GAO Jun-li XU Hong-fei CAO Wei YUAN Chuan |
| |
| Institution: | Department of Civil Engineering, Shanghai University, Shanghai 200444, China |
| |
| Abstract: | In order to further study the drawing test mechanism of the ribbed geomembrane, the mesoscopic properties of interface between ribbed geomembrane and sandy soil under different working conditions (ribbed height and temperature), the displacement and velocity field distribution of particles within the liner system were studied using laboratory drawing test and particle image velocimetry(PIV) analysis. The results show that different ribbed heights and temperatures have significant influence on the stability of the interface, and the ultimate drawing resistance increases with the increase of ribbed height and the decrease of temperature. The mesoscopic analysis shows the sandy soil near the interface of ribbed geomembrane and sandy soil can form indirect impact area. The sandy soil displacement and velocity within the indirect impact area are larger than that of surrounding sand particle, this can be explained by that the rib squeezes the left side of the rib or moves it as a whole during the drawing process. Moreover, the indirect impact area between the ribs interacts with each other, and thus causes strengthen effect on sand particles. Experimental results and PIV analysis indicate that temperature and ribbed height have significant effects on the indirect influence zone, so that the two factors have significant influence on the interface stability of ribbed geomembrane and sandy soil. |
| |
| Keywords: | ribbed geomembrane drawing model test partical image velocimetry(PIV) displacement velocity |
|
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
