压力型锚杆锚固段荷载传递机理研究  

Study on Load-transfer mechanism of anchorage segment of pressure-type anchor

作　　者：贺建清[1] 王磊[1] 陈秋南[1] 

机构地区：[1]湖南科技大学,湘潭411201

出　　处：《应用力学学报》2013年第6期864-869,952-953,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(41172275);湖南省教育厅资助项目(12K103)

摘　　要：利用弹性力学理论分别计算了锚固体因轴向压缩导致径向膨胀而产生的径向应变以及锚孔因锚固体挤压周围岩体产生的径向应变。根据锚固体与周围岩土体变形协调假定,导出了压力型锚杆锚固段径向应力、轴向应力、剪应力分布的理论解,并对压力型锚杆足尺模型进行了试验。结果表明:锚固体轴向应变实测值与理论计算值比较吻合,验证了理论解的可靠性。基于上述理论解确定了有效锚固长度,分析了岩土体弹性模量与注浆换算弹性模量比值E/Ea、锚固力F、抗剪强度指标c、φ等岩土体力学参数对有效锚固长度的影响。结果表明:E/Ea值和c、φ值越小、F值越大,所需有效锚固长度越大。Based on the theory of elastic mechanics, the radial strain of anchorage body due to radial swelling under axial compression, subsequently the radial strain of drill hole caused by the radial expansion of anchorage body are all calculated. Theoretical solutions for the distribution of radial stress, axial stress and shear stress are derived based on the assumption of a compatible deformation between anchorage body and surrounding rock soil mass. Laboratory tests are carried out with full-size model. Test results obtained show that the practical measurement of axial stresses on the anchorage body basically conform with theoretical calculation results,proving the reliability of above theoretical solution. Once the effective anchorage length of anchor is deduced, influence of mechanical characteristics of the rock mass on effective anchorage length can be analyzed.

关 键 词：压力型锚杆 锚固 应力 有效锚固长度 模型试验 

分 类 号：TU45[建筑科学—岩土工程]