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钢筋笼扩大头锚杆因承载力高、整体性好，在建筑工程抗浮中成效显著，因此可将其推广应用于公路软岩边坡支护工程。通过现场拉拔试验和有限元模拟对钢筋笼扩大头锚杆支护软岩边坡的稳定性进行研究。首先，基于依托工程进行了钢筋笼扩大头锚杆现场拉拔试验，得到了荷载-锚头位移变化规律；其次，基于有限元软件建立锚杆支护软岩边坡的三维模型，并通过与现场拉拔试验结果对比验证了有限元模型的有效性；最后，通过数值计算和参数分析，讨论了锚筋直径、扩体段直径和锚固深度对支护软岩边坡稳定性的影响。研究表明：钢筋笼扩大头锚杆支护软岩边坡时主要锚固力由注浆体与岩体之间的黏结力提供，端阻力未充分发挥；增大锚筋直径可提升边坡稳定安全系数；扩体段直径在注浆体与岩体黏结良好时对边坡稳定性影响较小，黏结性能较差时扩体段直径的增加能显著提高边坡稳定安全系数；锚固深度越大，边坡稳定安全系数越高，但当锚固深度达到软岩边坡的最大滑移面时，边坡稳定安全系数增幅逐渐减小。
Abstract：The end-expanded anchor rod with rebar cage is widely used in soft rock slope support due to the advantages of high bearing capacity and great integrity by adding rebar cage in the expansion section to improve the overall performance of the anchor rod.This study investigated the stability of soft-rock slope supported by end-expanded anchor rods with rebar cage through field pull-out tests and finite element simulations.Firstly, based on the supporting engineering, field pull-out tests were conducted on the end-expanded anchor rod with rebar cage, and the load-displacement at anchor head variation law was obtained.Secondly, the three-dimensional model of soft-rock slope supported by end-expanded anchor rods with rebar cage, based on the finite element software ABAQUS,was established and then verified by comparing with the result of field pull-out test.Finally, the influences of anchor bar diameter, expansion section diameter, and anchor depth on the stability of supporting soft rock slopes were discussed through numerical calculation and parameter analysis.The main conclusions indicate that increasing the diameter of anchor bars will increase the slope stability safety factor; the expansion section diameter has a relatively small impact on the slope stability when the grouting body and rock mass are well bonded, but an increase in the expansion section diameter can significantly improve the slope stability safety factor when the bonding is small; the greater the anchoring depth, the higher the slope stability safety factor, while the increase amplitude in slope stability safety factor gradually decreases when the anchoring depth reaches the maximum sliding surface of the soft rock slope.
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基本信息:
DOI：10.16468/j.cnki.issn1004-0366.2026.03.001
中图分类号:U418.5
引用信息:
[1]罗熹,王曌丞,唐小明,等.钢筋笼扩大头锚杆支护软岩边坡的稳定性分析[J].甘肃科学学报,2026,38(03):1-11.DOI:10.16468/j.cnki.issn1004-0366.2026.03.001.
基金信息:
国家自然科学基金资助项目(52378328)
2024-10-23
2024
2024-11-20
2024-11-25
2024
1
2026-03-30
2026-03-30
2026-03-30