拉拔荷载下黄土隧道锚杆受力特性模型试验研究  

Study on Model Tests of Mechanical Behavior of Loess Tunnel Bolt under Pull-out Load

作　　者：郜中阳 GAO Zhong-yang(Shanxi Transportation Research Institute Group Co.,Ltd.,Taiyuan,Shanxi 030006,China)

机构地区：[1]山西交通科学研究院集团有限公司黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006

出　　处：《山西交通科技》2022年第4期96-98,108,共4页Shanxi Science & Technology of Transportation

摘　　要：自制室内模型试验箱,利用微型锚杆拉拔仪研究了拉拔荷载作用下不同锚固体长度下黄土锚杆与土体界面剪应力分布规律,试验结果表明拉拔荷载作用下黄土围岩锚固体最大剪切应力出现在距锚头25倍锚固体直径区段内,锚固体长径比为110以上时,锚固体中后部剪应力才能得到发挥。此结论与基于Mindlin问题的位移解得出的拉拔荷载作用下黄土系统锚杆所受剪应力和轴力的理论解做了比较分析。基于室内模型试验提出的相关结论对黄土隧道锚杆设计具有工程参考价值。Preparing indoor model test boxes,the shear stress distribution of the interface between the loess bolt and soil of different anchorage lengths under pull-out loads is studied by the micro bolt pull-out instrument.The test results show that the maximum shear stress occurs in the section 25 times the diameter of the anchorage from the anchor head,and when the length-diameter ratio of the anchorage is more than 110,the shear stress in the middle and rear of the anchorage can be developed,which is compared with the theoretical solution of the shear stress and axial force of the bolt of loess system under pull-out load based on Mindlin’s displacement solution.Relevant conclusions based on the indoor model test have engineering reference values for the design of loess tunnel bolt.

关 键 词：拉拔荷载 黄土隧道 系统锚杆 受力特性 模型试验 

分 类 号：U455.71[建筑科学—桥梁与隧道工程]