可回收式锚杆拉拔试验的数值模拟与影响因素分析  

Numerical simulation of removable anchor pullout test and influence factors

作　　者：庞有师[1,2,3] 刘汉龙[1,2] 陈育民[1,2] 

机构地区：[1]河海大学土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]解放军理工大学工程兵工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2009年第2期170-174,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：江苏省"333高层次人才工程"资助项目(B08003)

摘　　要：为了分析影响可回收式锚杆抗拔力的因素,在对可回收式锚杆现场拉拔试验研究的基础上,建立可回收式锚杆三维有限元模型。通过数值模拟分析,探讨可回收式锚杆的受力机理和破坏形式,得到可回收式锚杆的锚固体与周围土体之间的界面剪应力分布和传递规律。分析表明,可回收式锚杆的破坏主要是由于锚固体与周围土体之间的界面剪应力大于界面粘结力而引起的,而且界面剪应力分布不仅与外荷载、锚固长度和锚固体半径有关,锚固体也存在着临界长度和临界半径。In order to analyze the factors which influence the withdrawal resistance of removable anchor, a three-dimension finite element model was established based on the pullout test of removable anchor. Through calculating with various parameters of the model, the load-bearing mechanism and destruction forms of the anchorage were discussed, and the distribution of interfacial shear stress between the bonding segment and soil was obtained. The results indicate that the reason of the anchor＇ s destruction is that the interfacial shear stress is greater than the interfacial adhesion. Furthermore, the interfacial shear stress is related to loads, anchorage length and radius, and the bonding segment has critical length and critical radius.

关 键 词：可回收式锚杆 界面剪应力 锚固段 临界长度 数值模拟 

分 类 号：TD353.6[矿业工程—矿井建设]