筋土界面参数的拉拔试验过程划分研究

Experimental research on pull-out tests process-separation for reinforcement/soil interface parameters selection

用正交设计表L9(34)安排了测试膨胀土、砂土与土工格栅界面参数的54次拉拔试验,提出了当量拉拔位移的概念。将筋土界面的拉拔试验过程划分成可获取不同位移状态下筋土界面参数的两大部分和三个阶段,据此,可合理获取适用于极限平衡和工作应力状态下的筋土界面参数。

Fifty four pull-out tests between geogrid and expansive soil, sand designed by orthogonal table L9(34) were performed, the variable rules of friction parameter between reinforcements and soils (FPBRS) defined by different criterion have been given, as well as the affecting degree of factors influencing on FPBRS. And in accordance with concept of equivalent pull-out displacement presented and the performance of FPBRS, the whole process of pull-out tests were divided into two parts and three stages, with which the FPBRS could be reasonably gained in various displacements states, thus it's possible to gain the FPBRS both in limit state and working stress conditions.