压力型和拉力型锚杆承载性状对比试验研究  

Comparative Experiment on Bearing Behavior of Pressure-type and Tension-type Anchor

作　　者：胡成兵 

机构地区：[1]中国铁建十六局集团第三工程有限公司,湖州313000

出　　处：《湖南工程学院学报（自然科学版）》2013年第2期77-80,94,共5页Journal of Hunan Institute of Engineering(Natural Science Edition)

基　　金：湖南省教育厅科研资助项目(12K103);湖南省科技计划资助项目(2009SK3037)

摘　　要：基于现场试验,对比研究了压力型、拉力型锚杆的承载性状.研究结果表明,压力型、拉力型锚杆的破坏形式为锚固段砂浆体与岩土层间的粘结滑移破坏,两者的极限承载力主要取决于锚固段与周围岩土体的粘结力.在相同条件下,压力型锚杆极限承载力标准值较之拉力型锚杆提高了近70%.张拉荷载与锚头位移的关系具有明显的非线性特征,采用双曲线模型进行拟合,具有较好的吻合性.采用高强钢筋作为杆体材料的压力型锚杆的承载性状较之于普通拉力型锚杆有明显改善.By field tests, the bearing behaviors of pressure-type anchor and tension-type anchor are comparatively studied. The results show that the failure of them is due to bond-slip between mortar body of anchorage segment and rock soil. The ultimate bearing capacity of pressure-type anchor and tension-type anchor mainly depends on bond force of anchorage segment and rock soil. under the same condition, the normalized value of ultimate bearing capacity of pressure-type anchor increases nearly 70%. The relation-ship between tension load and anchor-head displacement has obvious nonlinear characteristics. The results of hyperbola model analysis are verified by the results of experiments. Comparing with the ordinary ten- sion-type anchor,the bearing behavior of pressure-type anchor with high tensile reinforcement as a lever body material is obviously improved.

关 键 词：现场试验 承载性状 加固机理 锚杆 

分 类 号：TU470.3[建筑科学—结构工程]