硫酸盐腐蚀锚索结构锚固性能退化规律试验研究

doi:10.13722/j.cnki.jrme.2014.1214

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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.

Key words： geotechnical engineering anchor cable durability sulfate attack restriction of embracing rock characteristic anchoring parameters

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1214 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I08/1581

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