摘要
锚索与抗滑桩分离式组合结构用于加固折线型滑面高陡堑坡时,上部锚索限制坡体变形、防止次级滑动并分担剩余下滑力,下部抗滑桩则稳固坡脚、防止边坡整体滑动。然而,现有设计规范对直线型滑面给出了计算方法,对折线型滑面则无直接计算方法;现有设计方法并不成熟,大多粗略地将剩余下滑力进行分配,不能良好实现二者受力协调。为了研究桩-锚分离式组合结构加固折线滑动边坡中各结构的实际受力状况、优化结构设计及推广工程应用,通过理论分析、公式推导及工程实例论证,提出了锚索锚固力在折线滑动条块上的受力计算方法及组合结构优化设计方法。通过在条块上计入锚索锚固力,计算设桩处的剩余下滑力,提高桩身受力的准确性;通过调整总剩余下滑力水平分力承担比,提高组合结构设计的安全性与经济性。以德(昌)至会(理)高速某实际边坡为例,论证了该设计方法的可行性,在进行受力分配后,锚索实际锚固力折减达15.27%,抗滑桩实际受力增大了10.16%。结果表明:设计中人为粗略分配剩余下滑力是不合理的,会造成桩身受力偏小,降低了桩体设计安全度,将给工程带来安全隐患,该方法可为类似工程设计提供借鉴。
When the separated composite structure of anchor cable and anti-slide pile is used to reinforce high and steep cutting slope with broken-line sliding surface,the upper anchor cable limits the deformation of the slope and prevents secondary sliding and shares the residual sliding force,while the lower anti slide pile stabilizes the slope toe and prevents the overall sliding of the slope.However,the calculation method for linear sliding surface is given in the existing design code,but there is no direct calculation method for brokenline sliding surface.The existing design methods are not mature,most of them just roughly distribute the residual sliding force between both of the anchor cable and anti-slide pile,which cannot achieve the force coordination between them.In order to study the actual force state of each structure in the broken-line sliding slope reinforced by pile anchor separated composite structure,optimize the structural design and popularize the engineering application,through theoretical analysis,formula derivation and engineering example demonstration,the method for calculating the anchor cable anchoring force on the broken-line sliding strip and the method for optimization design of the composite structure are proposed.By including anchor force of anchor cable onto sliding strip,the residual sliding force at the pile is calculated to improve the accuracy of the force of pile.By adjusting the bearing ratio of the horizontal component of the total residual sliding force,the safety and economy of the composite structure design is improved.The feasibility of the design method is demonstrated based on the case study of an actual slope on the Dechang-Huili expressway.After the force distribution,the actual anchoring force of anchor cable is reduced by 15.27%,the actual force of anti-slide pile is increased by 10.16%.The result shows that it is unreasonable to roughly distribute the residual sliding force artificially in the design.It will cause small force borne by the pile body,thus will reduce the safe
作者
吴兵
梁瑶
唐晓波
赵晓彦
蒋楚生
WU Bing;LIANG Yao;TANG Xiao-bo;ZHAO Xiao-yan;JIANG Chu-sheng(Sichuan Communications Surveying&Design Institute Co.,Ltd.,Chengdu Sichuan 610017,China;School of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu Sichuan 611756,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第3期40-48,共9页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(41672295)
四川省交通运输科技立项支持项目(2015B1-1)
中国铁路总公司科技研究开发计划系统性重大项目(P2018G047)。
关键词
道路工程
折线型滑面
锚索
抗滑桩
设计方法
road engineering
broken-line sliding surface
anchor rope
anti-slide pile
design method
