拉力型扩体锚杆抗拔模型试验研究  

PULL-OUT MODEL TEST ON TENSION UNDERREAMED ANCHOR

作　　者：张慧乐[1,2] 刘钟[1,2] 赵琰飞[1,2] 柳建国[1,2] 

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]中国京冶工程技术有限公司,北京100088

出　　处：《工业建筑》2011年第2期49-52,共4页Industrial Construction

基　　金：岩土工程防灾减灾与治理加固关键技术研究(财企[2009]161)

摘　　要：利用自制锚杆拉拔仪,针对锚杆扩体段直径(D)和长度(L)两个变化因素,对4组模型扩体锚杆进行抗拔试验发现,Q-s循环张拉曲线分为线性增强、强化、衰退3个阶段,扩体段直径的大小对扩体锚杆极限承载力影响很大,而扩体段的长度长短对扩体锚杆极限承载力影响相对较小。试验结果表明,扩体锚杆存在尺寸效应,在工程实践中,对扩体段的直径和长度进行优化设计,有助于提高扩体锚杆的技术优势和经济效益。Four groups pull-out model tests of underreamed ground anchor were done by self-designed anchor drawing device,which was used to research the ultimate bearing capacity about diameter and length of underreamed segment.The test results show that Q-s curves have three phases,expanded diameter has more impact on the ultimate bearing capacity,and the effect of length is relatively small.The underreamed anchor has obviously the size effect,the optimization of underreamed body’s diameter and length will achieve the technical advantage and economical benefit in practice.

关 键 词：拉力型锚杆 扩体锚杆 承载特性 模型试验 

分 类 号：TD353.6[矿业工程—矿井建设]