不同侧压系数下锚固力变化规律试验研究  

TESTING STUDY OF CHANGING LAW OF ANCHORING FORCE UNDER DIFFERENT LATERAL PRESSURE COEFFICIENTS

作　　者：查文华[1,2] 王小坡[1,2] 石崇[3] 刘春生 

机构地区：[1]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [2]安徽理工大学能源与安全学院,安徽淮南232001 [3]河海大学岩土工程科学研究所,江苏南京210098 [4]武汉长盛工程检测技术开发有限公司,湖北武汉430312

出　　处：《岩石力学与工程学报》2013年第S2期3141-3145,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51004002);高等学校博士点新教师基金(20103415120001);安徽省高校省级自然科学研究项目(KJ2012A088)

摘　　要：通过室内拉拔试验,研究不同侧压系数下锚固失效形式及锚固力的变化规律。研究结果表明:不同侧压系数下锚固破坏以锚杆–锚固层界面脱黏为主,并部分伴有锚固层破碎、锚固层–钻孔壁脱黏;锚杆承受最大荷载随侧压系数的增大而增大,当侧压系数达到1.3时,锚杆所承受最大荷载达到最大值,之后随侧压系数的增大,锚杆所受最大荷载下降;黏结界面随锚固的破坏相继出现弹性变形区、塑性滑移变形区和脱黏变形区,径向荷载主要增加锚杆–锚固层界面塑性滑移变形区的摩擦力,从而增大锚杆拉拔最大荷载。In order to research the invalidation mode of anchor bolt and the changing rule of anchoring force under different lateral pressure coefficients,pull-out tests were performed. The results show that:it was dominated by losing binding between anchor bolt with anchor layer interface accompanying that breaking of anchor layer and also losing binding between anchor layer with drilling hole wall,and the largest load force enlarged with the lateral pressure coefficients increase,when the coefficient reach 1.3,the largest load force of anchor blot was received, after that it was decreased by lateral pressure coefficients increased. The elastic deformation zone,plastic slip deformation zone and the losing binding deformation zone were emerged one after another on binding interface with anchor damaged. The friction force was enhanced by radial load on slip deformation zone between anchor bolt and anchor layer interface and then the largest pull-out load was increased.

关 键 词：岩石力学 黏结界面 锚固失效 锚杆支护 侧压系数 

分 类 号：TU452[建筑科学—岩土工程]