锚固力在简化Bishop法中计入方式的探讨  

Discussion on the Calculation Method of Anchoring Force in Simplified Bishop Method

作　　者：林枢 LIN Shu(Fujian Geological Engineering Survey Institute,Fuzhou 350002,China)

机构地区：[1]福建省地质工程勘察院,福州350002

出　　处：《路基工程》2022年第5期9-13,共5页Subgrade Engineering

基　　金：国家自然科学基金项目(41977259)。

摘　　要：锚杆(索)是公路边坡加固工程中普遍应用的方法之一,简化Bishop法也是现行规范推荐的一种计算方法,但锚固力在简化Bishop法计算中如何计入,不同的规范有不同的规定。为得到统一的计算公式,通过公式推导,得到改进的简化Bishop法计算公式,公式中引入了法向力作用系数与切向力作用系数。法向力作用系数不是一个折减系数,建议由公式直接计取;切向力作用系数区分了普通锚杆与预应力锚杆之间计算的差异性,并考虑了预应力锚索锁定值与损失值的情况。结合某一具体公路工程实例,采用不同公式及不同参数取值对同一滑面进行稳定性计算,通过比较表明:推导得到的公式能更科学准确地评价边坡的稳定性。Anchor bolt(cable)is one of the commonly used methods in highway slope reinforcement engineering.The simplified Bishop method is also a calculation method recommended by the current code.However,different codes have different regulations on how to include the anchoring force in the calculation of the simplified Bishop method.In order to obtain a unified calculation formula,the improved simplified Bishop method calculation formula is obtained through formula derivation.The normal force exertion coefficient and tangential force action coefficient are introduced into the formula.The value of normal force action coefficient is not a reduction coefficient,so it is suggested to be calculated directly by the formula.The tangential force action coefficient distinguishes the calculation difference between ordinary anchor and prestressed anchor,and considers the locking value and loss value of prestressed anchor cable.Combined with a highway engineering case,different formulas and different parameter values are used to calculate the stability of the same sliding surface.Through the comparison,it shows that the deduced formula can evaluate the stability of slope more scientifically and accurately.

关 键 词：锚固力 简化BISHOP法 法向力作用系数 切向力作用系数 预应力锚索 边坡稳定性 

分 类 号：U412.33[交通运输工程—道路与铁道工程]