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预应力群锚根状效应原位试验研究 预览 被引量:5

Field testing study on root effect mechanism of prestressed anchor cable groups
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摘要 根据悬索桥隧道式锚碇系统预应力岩锚原位试验及模拟计算结果,分析了锚索的锚固长度、自由长度、锚固注浆压力以及锚注体与围岩界面结合程度对岩锚极限抗拔力的影响。比较了群锚与单锚作用下的岩锚本身及宿主介质的荷载、位移分布特征。群锚约束岩体向临空面变形,具有增韧止裂的根状效应,受埋深(自由长度)、问距、初始预应力、加载历史等影响。锚索的锚固长度控制着岩锚的极限承载力,而自由段长度控制着其在隧道式复合锚碇系统中参与荷载分担的贡献值和时机,自由段长度对有效传递和分散围岩应力有关键作用。指出群锚整体破坏形态存在传递多米诺效应。 Based on field testing and numerical simulation results on prestressed anchor cable of suspension bridge with tunnel style anchorage system, the ultimate anti-pulling capacity of prestressed anchor cable affected by anchor length, free length, grouting pressure and the level of combination between grout-cable and rock mass were analyzed. The load and displacement distribution characteristic of anchor cable and host rock medium were compared single anchor with anchor cable group. Due to enhanced toughness and anti-crack of root effect, which were affected by embedded depth(free length),spacing, initial prestress, load history, etc., anchor cables restrained the rock mass deforming toward surface. Anchor length determines the ultimate anti-pulling capacity, but free length has key effect to transfer and disperse stress to wall rock and determines contribution value and occasion while they participated the load applied on tunnel anchorage system. Domino effect occured while the anchor cable group was destroyed.
作者 汪海滨 高波 WANG Hai-bin, GAO Bo (School of Civil Engineering, Southwest Jiaotong University, Sichuan 610031, China)
出处 《岩土力学》 EI CSCD 北大核心 2006年第1期 77-82,88,共7页 Rock and Soil Mechanics
基金 西藏交通厅和四川交通厅联台资助项目(No.200309).西南交通大学博士创新基金资助.
关键词 预应力群锚 原位试验 根状效应 破坏形态 抗拔承载力 prestressed anchor cable group field testing, root effect mechanism failure model anti-pulling capacity
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