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全长粘结式预应力锚索锈胀开裂时服务年限研究

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：949-953
语言：中文
分类：TV554.12[水利工程—水利水电工程] TD824.72[矿业工程—煤矿开采;矿业工程—矿山开采]
作者机构：[1]江苏省地震工程研究院,南京210014, [2]河海大学岩土工程研究所,南京210098
相关基金：国家重点基础研究发展规划（973）项目（No.2002CB412707）;国家自然科学基金重点项目联合资助（No.50539110）.
相关项目：岩石高边坡失稳的大型滑坡预警和防治

关键词：全长粘结式预应力锚索, 锈胀开裂, 服务年限, 注浆体, 环向应力, 锚索体, wholly bonded prestressed cable, corrosion expansion crack, service life, grout body, hoop stress, cable body

中文摘要：

将全长粘结式预应力锚索注浆体受到的环向应力，考虑为预应力引起的注浆体环向拉应力和锚索体对注浆体的锈胀力共同作用，推导出锚索体均匀锈蚀导致注浆体开裂时的极限增长量计算公式。在前人研究成果基础上，得出了水利水电工程高边坡的预应力锚索开裂时服务年限的估算表达式。最后，结合2 000kN预应力锚索，探讨了与服务年限相关的4个影响因素及其相对重要性：预应力对服务年限最不敏感，随着预应力的增加，服务年限逐渐减小，曲线呈线性函数关系；锚索体直径要相对敏感得多，随着锚索体直径的增加，服务年限逐渐增加，曲线的斜率逐渐稍微变陡；然后是握裹层厚度，随着握裹层厚度的增加，服务年限也逐渐增加，曲线的斜率逐渐稍微变陡；最敏感的是注浆体抗压强度，随着抗压强度的增加，服务年限逐渐增加，曲线的斜率也逐渐稍微变陡。

英文摘要：

A calculation formula of limit to growth length when grout body cracked is deduced from the hoop stress of wholly bonded prestressed cable grout body, which is concurred between the hoop tension stress is created by pretension and the uniformly corrosion expansion force by cable body. An estimation expression of the service life when grout body of prestressed cable cracked is solved based on predecessors＇ research production, which is used in high slope of water resources and hydropower engineering. At last, four factors related to service life and their relative importance are discussed, which is combined with the prestressed cable of 2 000kN. It is concluded that： the pretension is the most insensitive factor. With the increase of the pretension, the service life decreases, in which the curve is linear. The influence of the cable body diameter is relatively much stronger than the pretension. With the increase of the cable body diameter, the service life increases, in which the curve＇s gradient is slightly steepening. The influence of bond thickness is a little stronger than the cable body diameter. With the increase of bond thickness, the service life also increases, in which the curve＇s gradient is slightly steepening. Whereas, the compression strength of grout body is the most sensitive factor that affected the service life. With the increase of the compression strength, the service life increases, in which the curve＇s gradient is also slightly steepening.

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