腐蚀对锚索力学性能影响的试验研究

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摘要通过施加、未施加预应力钢绞线裸筋和施加、未施加预应力注浆空洞缺陷锚索4种不同类型锚索锚筋的腐蚀试验，分析研究在强腐蚀环境条件下锚索锚筋的腐蚀情况、腐蚀速率、力学性能随时间的变化规律等，对腐蚀造成锚索锚筋力学性能降低及不同类型试样的降低差异进行分析，对锚索腐蚀试样断裂荷载随时间的变化关系进行回归分析。分析结果表明：在相同的腐蚀环境条件下，存在注浆空洞(或PE套管、波纹管破损)缺陷的锚索，其腐蚀的速率比钢绞线裸筋要快，比无缺陷锚索更快；应力腐蚀对锚索锚筋力学性能的影响较大；在进行多种不同腐蚀环境锚索锚筋断裂荷载与腐蚀时间关系试验的基础上，可以通过锚索锚筋断裂荷载与时间关系的回归拟合曲线，推断某一腐蚀条件下锚索锚筋的断裂荷载，从而进行锚索的安全评价和寿命预测。

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关键词 ：岩土锚固, 锚索, 腐蚀试验, 腐蚀速率, 应力腐蚀, 力学性能

Abstract：The erosion situation，erosion rate and mechanical behavior rules of steel strands in anchors with time have been analyzed and studied through taking erosion tests in strong erosion condition on four types of anchors as steel strand and injection cavity defect anchor with or without prestressing separately. The mechanical behavior reduction of steel strands in anchors and the mechanical behavior reduction differences among various types of samples have been analyzed as well. The regression analysis of the variation of the fracture load of erosion anchor samples with time is conducted. The study results show that in the same erosion condition，the erosion rate of anchors with injection cavity defects(or with broken PE casings or bellows) is faster than steel strand，of course much faster than anchors without defects. Stress erosion has great effect on the mechanical behavior of steel strands in anchors. Based on various tests of the fracture load of steel strands in anchors with erosion time in different erosion conditions，the fracture load can be inferred in a certain erosion condition through the regression curves of relationship between fracture load and time for steel strands in anchors. Therefore，the safety assessment and life prediction to anchors can be carried out.

Key words： anchorages of rock and soil anchor cable erosion test erosion rate stress erosion mechanical behavior

收稿日期: 2010-04-23

引用本文:

郑静，曾辉辉，朱本珍. 腐蚀对锚索力学性能影响的试验研究[J]. 岩石力学与工程学报, 2010, 29(12): 2469-2474.
ZHENG Jing，ZENG Huihui，ZHU Benzhen. TEST STUDY OF INFLUENCE OF EROSION ON MECHANICAL BEHAVIOR OF ANCHOR. , 2010, 29(12): 2469-2474.

链接本文:

http://www.rockmech.org/CN/Y2010/V29/I12/2469

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