预应力锚索锚固段的剪滞-脱黏模型  

SHEAR LAG-DEBONDING MODEL FOR ANCHORAGE SECTION OF PRESTRESSED ANCHOR CABLE

作　　者：尤春安[1,2] 战玉宝[3] 刘秋媛[1] 孙琳琳[1] 王开彬[1,4] 

机构地区：[1]山东科技大学土木建筑学院,山东青岛266510 [2]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266510 [3]山东科技大学资源与土木工程系,山东泰安271019 [4]山东省工程咨询院,山东济南250013

出　　处：《岩石力学与工程学报》2013年第4期800-806,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51274137)

摘　　要：基于预应力锚索锚固体从岩土体中拔出计算模式,通过锚固体与灌浆材料的界面界面层变形–破坏过程分析,将锚固段分为弹性区、塑性滑移区和脱黏区,建立锚固体–岩土体界面力学模型,采用与Coulomb条件关连的流动法则,导出界面应力分布的理论解;同时,构造具有剪胀和滑移特性的新型有限元界面单元,采用数值模拟的方法与界面应力分布的理论解进行相互验证,为锚固体受力的计算、分析与锚固体的设计提供理论依据。分析表明,锚固体的弹性区和脱黏区的受力较小,主要受力部分是塑性滑移区。因此,锚固体荷载的主要工况是塑性滑移状态,在研究或进行锚固体设计时应该主要基于这种变形状态。提高滑移区脱黏前的最大剪应力和增大滑移区的范围是提高锚固体的锚固力的实质。Based on the calculating pattern of pulling prestressed anchorage body out from the base,the anchorage section can be divided into elastic region,plastic slide region and debonding region after analyzing the deformation and the damage process of the interface layer between anchorage body and grouting material,and the interfacial layer model for anchorage body and rock and soil mass is established.The theoretical solution of interfacial stress distribution was deduced by adopting the flow rule which associates with Coulomb condition.At the same time,a kind of new interface element model with properties of dilatancy and slippage is constructed;and interfacial stress distribution is calculated by two ways of numerical simulation and theoretical solution to verify the correctness of each other,so as to provide a new theoretical basis to calculate,analyze and design anchorage bodies.The results indicate that the main mechanical region is plastic slide region.So the plastic slippage state is the main state which the anchorage body usually in,so our researching and designing should be based on this state.In order to improve the anchoring force,we should improve maximum shear stress and extend the range of slip regime before the slip regime entering the debonding state.

关 键 词：岩土工程 锚固段 锚固力 界面层 塑性滑移 剪滞–脱黏模型 

分 类 号：TU473[建筑科学—结构工程]