抗浮锚杆的抗拔承载力分析和数值模拟

Uplift Bearing Capacity Analysis and Numerical Simulation of Anti-floating Anchor

近几十年来,土层锚杆技术在水工建筑、高耸结构、深基坑工程及边坡工程中得到广泛应用,尤其是端头扩大型锚杆的不断改进和应用,它不仅可利用锚固段和孔底扩大头的端头效应提供足够的锚固抗拔力,同时可减少锚固深度及孔径和上拔位移量,因此具有广泛的适用性。针对将扩大头锚杆作为抗浮锚杆应用于地下工程中的情形,提出了极限抗拔承载力的计算公式。基于算例分析和数值模拟进一步对其进行验证,结果表明了该理论公式的有效性和适用性,并对极限抗拔承载力的影响因素进行讨论,对建筑结构的地下抗浮锚杆的设计有很好的借鉴作用。

In recent decades, the soil anchor technique has been extensively applied in hydraulic structure, high-rise structure, deep foundation pit engineering and slope engineering. Especially, the expanding head anchor has been constantly improved and applied, which could not only provide the adequate anchorage pull-out resistance, but also reduce the anchoring depth, aperture and displacement by utilizing the enlarged end effect in anchorage segment and bottom, so it has extensive applicability. For using the expansion head bolt as anti-floating anchor in underground engineering, the calculation formula of ultimate uplift bearing capacity is proposed here. Based on the example analysis and numerical simulation for further verification, the results show that the theoretical formula is effective and applicable, which could provide good reference for the deign of the anti-floating anchor in underground structures.