岩体离层作用下全长黏结型锚杆受力分析  

Mechanical Analysis of Fully Grouted Bolt Considering Bed Separation of Rock Mass

作　　者：丁潇[1] 王睿[1] 屈永龙 张轩 DING Xiao;WANG Rui;QU Yonglong;ZHANG Xuan(School of Civil and Architecture Engineering,Xi’an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021

出　　处：《西安工业大学学报》2023年第4期341-346,共6页Journal of Xi’an Technological University

基　　金：国家自然科学基金青年基金项目(11802218);陕西省自然科学基础研究计划项目(2022JQ 443);陕西省教育厅服务地方专项计划项目(22JC040);陕西省教育厅科研计划项目资助(22JK0416)。

摘　　要：针对巷道锚固范围内出现离层,引发锚杆脱粘失效的问题,基于围岩变形中全长黏结型锚杆的荷载传递机理,分析离层作用对锚杆的影响,建立含有离层的系统锚杆受力分析模型,研究岩体离层下锚杆受力特性及失效机制。研究结果表明:离层会对锚杆产生附加应力,系统锚杆在离层作用下锚固界面剪应力及杆体轴力迅速增大,且界面容易发生脱粘滑移;在离层位置处,界面剪应力发生跳跃,轴力最大值从中性点位置转为离层处;离层位置对锚杆的受力特性有一定影响,离层发生在中性点附近时,产生的不利影响最大。研究结果为易发生离层的巷道锚固支护设计提供理论参考。For the rock disbonding failure caused by bed separation in the anchorage layer of roadway,the mechanics models of systematic bolt with bed separation were established based on the load transfer mechanism of the fully grouted bolt.The stress characteristics and failure mechanism of rock bolt under bed separation were studied.The results show that bed separation will produce additional stress on rock bolt and that under the influence of bed separation,the axial force and shear stress of anchoring interface increase rapidly,which makes debonding and slipping of anchoring interface more likely to occur.Shear stress has a jump at the location of bed separation,and the maximum axial force is transferred from the neutral point to the location of bed separation.The location of the separation layer has some effect on the stress characteristics of the bolt,and has the greatest adverse effect when the bed separation occurs near the neutral point.This result will provide theoretical reference for the design of anchorage support of roadway where layer separation is likely to occur.

关 键 词：岩体离层 全长黏结型锚杆 中性点 剪切滑移 应力分布 

分 类 号：TD353[矿业工程—矿井建设]