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采用有限元法,研究预应力锚索锚固段应力分布的影响因素。讨论荷载作用下预应力锚索锚固段应力分布规律,分析荷载大小、被加固岩土体性质、锚固段长度、锚固体直径等因素对预应力锚索锚固段应力分布规律的影响。分析表明,预应力锚索锚固段应力分布非常不均匀;岩石越坚硬,锚固段应力分布越集中,岩石越松软,应力分布越均匀;锚固长度达到一定数值时,再增加锚固长度,只能导致锚索材料的浪费,而对承载能力的提高帮助不大;锚固体的直径越小,锚固段应力分布的峰值越大,应力分布越不均匀,锚固体的直径越大,应力的峰值越小,应力分布越均匀;锚固较硬的岩体,宜选用直径较粗锚固长度较短的锚索,而锚固较软的岩土体,宜选用直径较细锚固长度较大的锚索。
The finite element method is used to study the influencing factors of stress distribution in prestressed anchorage section. The stress distribution of prestressed cable anchorage section under load is discussed. The influence of load size, the properties of ground and rock mass, the length of anchorage section and the diameter of anchor body on the stress distribution of prestressed anchorage section is analyzed. The analysis shows that the stress distribution of the prestressed anchor cable is very uneven. The harder the rock, the more concentrated the stress distribution in the anchorage section. The softer the rock, the more uniform the stress distribution. When the anchorage length reaches a certain value, increasing the anchorage length can only result in The smaller the diameter of the anchor, the larger the peak stress distribution in the anchorage segment, the more uneven the stress distribution. The larger the diameter of the anchor, the smaller the peak value of the stress , The stress distribution is more uniform. For the rock mass with harder anchorage, it is better to choose the anchor cable with the shorter diameter and the shorter anchor length. For the rock and soil with the softer anchorage, the anchorage cable with smaller diameter and larger anchorage length should be used.