多重防腐锚杆抗腐蚀性试验研究  

Experimental study of corrosion resistance of multiple anticorrosive bolts

作　　者：李铮[1,2] 汪波[1,2] 何川[1,2] 李福海[2] 朱培[1,2] 宋洋[1,2] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《岩土力学》2015年第4期1071-1077,1146,共8页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973)项目(No.2010CB732105);国家自然科学基金资助(No.51378434);国家自然基金高铁联合基金资助(No.U1134208)

摘　　要：针对地下工程中锚杆防腐性能存在的不足,介绍了多重防腐锚杆的构造和防腐机制。通过模拟不同的腐蚀环境,进行双重和多重防腐锚杆的抗腐蚀性试验研究,观察腐蚀后锚杆的表观变化并测试其抗拔力,分析比较两者锚筋与水泥砂浆之间的粘结强度与滑移位移的关系。分析结果表明:多重防腐锚杆由于在水泥浆中设置了套管,在不同腐蚀环境中其拉拔力始终高于双重防腐锚杆,且随时间更加明显;硫酸盐的结晶作用和腐蚀因子间的牵制效应会使防腐锚杆拉拔力有短暂的提高;多重防腐锚杆产生相同滑移位移对应的粘结强度更大,粘结强度超过极值后的残余强度高于双重防腐锚杆。以上成果能够用于地下结构中防腐锚杆的设计和后期服役期间的耐久性分析,为实际工程中防腐锚杆的抗腐蚀性能研究提供了宝贵的基础资料。This paper reviews the insufficiency of anticorrosion performance of the bolts used in underground engineering and introduces both the structure and the anticorrosive mechanism of the multiple anticorrosive bolts. The experiments on corrosion resistance of both the dual and multiple anticorrosive bolts have been conducted under different corrosive environments, and the apparent change of bolts has been observed and the pullout capacity has been tested. The relationships of bond strength and sliding displacement between two types of anchor bar and cement mortar are also analyzed and compared. The analytical results indicate that because multiple anticorrosive bolts are enwrapped by casing in cement mortar, their pullout capacities in different corrosion environments are always greater than that of dual anticorrosive bolts, and the capacities grow more significantly with time. Sulfate crystallization and the drag effect between corrosion factors can cause a transient increase in pull-out capacity of the anticorrosive bolts, so that the bond strength of multiple anticorrosive bolts corresponding to same sliding displacement is higher, and the residual strength posterior to peak value is also greater than that of dual anticorrosive bolts. The above results can be used in the design of anticorrosive bolts in underground structures as well as the durability analysis during the later service period and also can provide valuable basic data for the study of corrosion resistance of anticorrosive bolts in practical engineering.

关 键 词：多重防腐锚杆 腐蚀环境 抗拔力 粘结强度 滑移位移 

分 类 号：TU473[建筑科学—结构工程]