Abstract: In order to study the anchorage mechanism of prestressed cable in soft rock and soil more accurately, the theoretical solution of the tangential shear stress at any point on the inner and outer curves of the bending anchorage section of the anchor cable were derived, which was based on the coupling effect between prestressing force of anchor cable and creep of soft rock and soil as well as combined with Boussinesq-Flamant solution and the plane stress state analysis of any point. A case study was carried out. The results show that the peak value of tangential shear stress on the inner and outer curves of the bending anchorage section of the anchor cable is positively correlated with the initial prestress F0 and negatively correlated with the bending radius R of anchorage segment. And the peak value of tangential shear stress of the inner curve in the bending anchorage section of the anchor cable is larger than that of the outer curve, and is mainly concentrated within 0.5m of the anchorage section. The research results complement and perfect the anchorage mechanism of prestressed cable in soft rock and soil.

Key words: geotechnical engineering; highway engineering; prestressed cable; coupling effect; borehole deviation; anchorage mechanism

摘要： 为了更加精确地研究软弱岩土体中预应力锚索的锚固机理，基于锚索预应力与软弱岩土体蠕变之间的耦合效应关系，结合Boussinesq-Flamant问题解和任意点的平面应力状态分析，推导了锚索弯曲锚固段内、外曲线上任意点切向剪应力的理论解；进行了算例分析。结果表明：锚索弯曲锚固段内、外曲线上切向剪应力分布曲线及剪应力峰值均与预应力初始值F0成正相关关系，与锚索孔道弯曲半径R成负相关关系；锚索弯曲锚固段内曲线的切向剪应力峰值比外曲线的大，且主要集中在锚固段0.5 m范围内。研究结果补充完善了软弱岩土体中预应力锚索的锚固机理。

关键词: 岩土工程；道路工程；预应力锚索；耦合效应；孔道弯曲；锚固机理