孔径对微型木锚杆加固石窟剥落病害抗拔力影响试验  

Experiment of borehole diameter on pullout capacity of pine rod in decreasing the spalling damage of grottoes rock mass

作　　者：柴新军 何春锋 李爱飞 李鑫杰 CHAI Xin-jun;HE Chun-feng;LI Ai-fei;LI Xin-jie(School of Civil&Architecture Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学建筑工程学院,南昌330013

出　　处：《桂林理工大学学报》2018年第1期100-105,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51668002;51368002);江西省科技厅科技支撑计划项目(20151BBE50014);江西省自然科学基金计划项目(20151BAB206056);江西省教育厅科技计划项目(GJJ150580)

摘　　要：剥落掉块病害是石窟普遍存在的病害类型,当前主要采用粘贴或粘贴加小锚杆锚固技术进行治理,但对小锚杆的锚固特性、抗拔能力、与其相适宜的钻孔直径等问题研究成果甚少。本项目提出采用微型木锚杆技术治理石窟剥落掉块病害,其典型特征是在直径小于20 mm的微型钻孔中,以松木锚杆为芯材、以环氧树脂-粉煤灰浆液进行灌浆锚固;主要研究木锚杆直径对极限抗拔力的影响、木锚杆直径不变时钻孔直径大小对极限抗拔力的影响等。试验结果表明:木锚杆极限抗拔力随木锚杆直径的增大而增大,但不成正比例增加关系;对确定直径的微型木锚杆,存在最佳钻孔直径的现象。工程实用时建议采用直径10 mm的木锚杆,相应的钻孔直径设定为14~16 mm。As spalling and falling damage are commonly existing in the grottoes,presently paste or paste combined small anchors are adopted for treating the problem.Yet less research is published for the mechanism of small anchors,for example,the effect of borehole diameter on pullout capacity of small anchors et.al.The micro pine rod techniques are presented for treating the spalling and falling problem of grottoes rock mass,in the typical technique,the borehole diameter is less than 20 mm,the pine rod is anchored by epoxy resin-fly ash slurry.The main research includes the influence of the diameter of the anchor rod on the ultimate pullout resistance;the influence of the borehole diameter on the pullout capacity for a certain diameter of pine rod.Test results indicate that the ultimate pullout capacity increases with the increasing of rod diameter,without exhibiting linear relations.For the pine rod with a certain diameter,there is an optimum borehole diameter correspondingly.In engineering practice,it is proposed that the diameter of pine rod is set as 10 mm and the corresponding borehole diameter is set as 14-16 mm.

关 键 词：石窟 剥落掉块病害 微型木锚杆 钻孔直径 拉拔力 

分 类 号：TU252[建筑科学—建筑设计及理论]