锚索预应力损失对某既有公路路堑边坡稳定性的影响研究

Research on the Influence of Anchor Cable Pre-Stress Loss on the Stability of an Existing Highway Cutting Slope

【目的】路堑边坡稳定性是影响公路运营安全的重要因素之一,为保证某公路段运营期边坡安全,以某公路路堑边坡为例进行分析。【方法】采用有限元软件GeoStudio中的slope模块,基于极限平衡法计算锚索不同预应力损失率条件下路堑边坡的稳定性,建立预应力损失率与边坡整体稳定性的关系式,结合现场边坡稳定状态调查及锚锁预应力损失率检测结果,综合评价现状条件下公路边坡的稳定性。【结果】研究结果表明,目前该路堑边坡处于基本稳定状态,若预应力损失率达到60%,则可能出现失稳风险。【结论】建议加强监测,并适时进行相关检测,必要时采取相应补强措施。

[Purposes]The stability of highwaycutting slope is one of the important factors affecting the safety of highway operation.In order to ensure the safety of the highway cutting slope during the operation period,this paper takes a highway cutting slope as an example to analyze.[Methods]The slope module in the finite element software GeoStudio is used to calculate the stability of the cutting slope under differ⁃ent pre-stress loss rates of anchor cables using the limit equilibrium method.The relationship between pre-stress loss rate and overall stability of the slope is established,and the stability of the highway slope under current conditions is comprehensively evaluated based on on-site slope stability investigation and anchor lock pre-stress loss rate detection results.[Findings]The results show that the cutting slope is basically stable,and if the prestress loss rate reaches 60%,there may be a risk of instability.[Conclu⁃sions]It is recommended to strengthen monitoring and conduct relevant testing in a timely manner,and take corresponding reinforcement measures if necessary.