摘要
目前在工程中，往往注重锚杆的荷载变形行为，很少关注其时间效应行为。我们做了2根土层灌浆锚杆的拉拔蠕变试验，并对锚杆拉拔的蠕变特征进行了分析。首先利用锚杆拉拔蠕变曲线画出了等时拉拔力一位移曲线，然后计算各时刻等时曲线的割线刚度，并分析了刚度和时间之间的关系。建立了锚杆抗拔的流变力学模型，并由此得到了长期抗拔力随时间的变化规律，求导出锚杆拉拔的长期抗拔力。结果表明，锚杆的长期抗拔力约为瞬时抗拔力的85％～90％。
The load-deformation behavior of soil anchors has received considerable attention in recent years, but relatively little attention has been paid to the time dependency of deformation. Based on two pull-out creep tests of grouted soil anchors, the creep property is investigated. According to the pull-out creep curves, isochronous force-displacement curves have been drawn. The secant rigidities of the isochronal curves at any moment have been calculated, and the relationship between the rigidity and time has also been analyzed. A rheologic mechanical model of the pull-out anchor has been established, from which the long-term pull-out strength of anchors has been obtained. The results show that the long-term pull-out strength is about 85 % ～ 90% of the instant pull-out strength.
出处
《工程勘察》
CSCD
北大核心
2006年第9期6-8,53,共4页
Geotechnical Investigation & Surveying
基金
中国博士后科学基金资助(200130155)
关键词
土层锚杆
蠕变
损伤
长期抗拔力
soil anchor
creep
damage
long-term pull-out strength
