EXPERIMENTAL STUDY ON DEGRADATION BEHAVIOR OF ANCHOR CABLES DUE TO SULFATE CORROSION
LI Fumin1，2，LIU Zhenguo1，3，LU Rong1，QU Yaxu1，ZHAO Yu1
(1. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；3. Tianyuan Construction Group Co.，Ltd.，
Linyi，Shandong 276000，China)
Abstract：Sulfate corrosion is one of the reasons why anchor cables undergo the degradation of long-term anchoring capacity. To simulate the sulfate corrosion to the host concrete of anchor cables and the anchoring behavior after corrosion under the restriction of rock，a kind of short-bonded specimen of cylindrical plain cement concrete wrapped by a steel pipe outside and permeated by a steel strand centrally was designed. Then a long-term sulfate corrosion to the specimens in cyclic wetting and drying conditions was conducted. When the corrosion test was completed，a static pull-out test was executed to observe the anchoring process，to obtain the bond-slip curves and to define the characteristic anchoring parameters. The results showed that the restriction of rock had a significant impact on corrosion process and anchoring behavior in pull-out process. The physical damage was prevented and the chemical damage was the main way of corrosion. In the pull-out test，the spiral ribs of concrete were planished gradually and the cable was pulled out finally. The whole bond-slip curve consisted of a sudden rising initially，then a jugged rising and a rapid falling stages finally. When the deformation modulus of rock increased，the allowable design slip，design strength，ultimate slip and ultimate strength increased accordingly. And when the corrosion of the concrete was aggravated，the design strength，ultimate slip and ultimate strength decreased accordingly，while the design slip increased due to the degradation of concrete modulus.
李富民1，2，刘贞国1，3，陆 荣1，璩亚旭1，赵 宇1. 硫酸盐腐蚀锚索结构锚固性能退化规律试验研究[J]. 岩石力学与工程学报, 2015, 34(08): 1581-1593.
LI Fumin1，2，LIU Zhenguo1，3，LU Rong1，QU Yaxu1，ZHAO Yu1. EXPERIMENTAL STUDY ON DEGRADATION BEHAVIOR OF ANCHOR CABLES DUE TO SULFATE CORROSION. , 2015, 34(08): 1581-1593.
赵 健，冀文政，肖 玲，等. 锚杆耐久性现场试验研究[J]. 岩石力学与工程学报，2006，25(7)：1 377-1 385.(ZHAO Jian，JI Wenzheng，XIAO Ling，et al. In-situ experimental study on anchor durability[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(7)：1 377-1 385.(in Chinese))
[2]
张思峰，宋修广，周 健，等. 预应力锚固结构耐久性及其二次加固技术研究[J]. 公路交通科技，2008，25(2)：30-39. (ZHANG Sifeng，SONG Xiuguang，ZHOU Jian，et al. Study on durability and secondary reinforcement technique of prestressed anchorage structures[J]. Journal of Highway and Transportation Research and Development，2008，25(2)：30-39.(in Chinese))
[3]
曾宪明，陈肇元，王靖涛，等. 锚固类结构安全性与耐久性问题探讨[J]. 岩石力学与工程学报，2004，23(13)：2 235-2 242.(ZENG Xianming，CHEN Zhaoyuan，WANG jingtao，et al. Research on safety and durability of bolt and cable-supported structures[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(13)：2 235-2 242.(in Chinese))
[4]
程良奎，韩 军，张培文. 岩土锚固工程的长期性能与安全评价[J]. 岩石力学与工程学报，2008，27(5)：865-872.(CHENG Liangkui，HAN Jun，ZHANG Peiwen. Long-term performance and safety assessment of anchorage in geotechnical engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(5)：865-872.(in Chinese))
2015, Vol. 34 
