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为研究后植大直径锚栓系统的锚固性能,采用非线性数值分析和试验对比的方法,对其传力机理、破坏模式、粘结剪应力和承载能力等问题进行研究。结果表明:后植大直径锚栓的破坏模式表现为浅层锥体(或双锥体)和深部粘结破坏的混合模式;其粘结剪应力在承受较小轴向荷载时符合基于弹性理论的双曲函数分布,在接近极限荷载时趋于均匀分布,但粘结剪应力明显随锚栓直径的增大而减小。采用CCD修正公式来估算的后植大直径锚栓的承载能力与试验结果吻合较好。
In order to study the anchorage performance of large diameter anchoring system after implantation, the problems of force transfer mechanism, failure mode, shear bond strength and load bearing capacity were studied by nonlinear numerical analysis and experimental comparison. The results show that the failure modes of large diameter anchors are mixed modes of shallow pyramidal (or double pyramidal) and deep bond failure. The bond shear stress is in accordance with the theory of elasticity The distribution of hyperbolic function tends to be uniform near the limit load, but the bond shear stress obviously decreases with the increase of the diameter of the anchor bolt. The load-bearing capacity of the large diameter anchor bolt estimated by the CCD correction formula is in good agreement with the test results.