基于CZM模型的锚杆拉拔脱粘特性研究

Research on Drawing and Debonding Characteristics of Anchor Based on CZM Model

锚杆是岩土工程中重要的支护构件,本文基于CZM(Cohesive Zone Model)模型分析全长粘结式锚杆的脱粘破坏特性。结果表明:对于岩石里固化后的水泥灌浆锚杆脱粘破坏主要经过3个阶段:弹性阶段、塑性破坏阶段、完全破坏阶段。锚固长度在一定范围内变化时,增加锚固长度,并不能增大破坏时的位移。

Anchor is an important supporting component in geotechnical engineering.The debonding failure performance of full-length adhesive anchor was analyzed based on coherent zone model(CZM).The results show that the debonding failure of cement-grouting anchor after solidification in rock mainly includes three stages:elastic stage,plastic stage and complete failure stage.When the anchor is not damaged and the anchorage length is within a certain range,the displacement of failure cannot be increased with the increasing the anchorage length.