竖向预应力锚索抗滑桩力学计算方法研究  

Study on mechanical calculation method of anti-slide pile with vertical prestressed anchor cable

作　　者：张金保 彭瑜 王鹏炜 刘宇 李沁蔚 ZHANG Jinbao;PENG Yu;WANG Pengwei;LIU Yu;LI Qinwei(Qinghai Provincial Construction and Management Bureau of High-Grade Highway,Xining 810008,Qinghai,China;Chongqing Chengtou Road and Bridge Administration Co.,Ltd.,Chongqing 400060,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Chongqing Zidong Construction Engineering(Group)Co.,Ltd.,Chongqing 401122,China;Chongqing Municipal Design and Research Institute of Design,Chongqing 400020,China;Chongqing Rail Transit(Group)Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]青海省高等级公路建设管理局,青海西宁810008 [2]重庆市城投路桥管理有限公司,重庆400060 [3]重庆大学土木工程学院,重庆400045 [4]重庆紫东建设工程(集团)有限公司,重庆401122 [5]重庆市市政设计研究院,重庆400020 [6]重庆市轨道交通(集团)有限公司,重庆401120

出　　处：《水利水电技术》2020年第6期138-146,共9页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51378521)。

摘　　要：梯形断面竖向预应力锚索抗滑桩是治理水毁滑坡的新结构。针对其结构的力学计算方法问题,建立计算模型和数值模型,探讨梯形抗滑桩的结构计算方法及内力和变形特征,并分析竖向预应力抗滑桩主要力学参数的影响规律。通过偏心距计算和绕曲线近似微分计算方法,推导出承载力设计验算及桩体结构受力和变形的计算公式。结果表明:外荷载以抛物线计算模型更符合工程实际情况。当参数条件一定时,承载力大小与外荷载的集中力和滑动面距离成反比,位移和转角大小与配筋强度成正比;桩身布置的竖向预应力增强了桩身结构抗弯性能并抑制了抗滑桩变形;量化对比分析了公式和模型计算变形效果,竖向预应力锚索结构分别优于竖向预应力锚索与钢筋共同结构的16.2%和14.2%,并分析得出了计算公式比模型变形算法值略大,其两种设计结构的算法偏差率分别为5.7%和7.5%。研究成果为同类工程提供理论参考。The anti-slide pile with trapezoidal section vertical prestressed anchor cable is a new structure for controlling waterdamaged landslides.Aiming at its mechanical calculation method for its structure,the calculation model and numerical model are established,and then the structural calculation method,internal force and deformation characteristics of the trapezoidal anti-slide pile are discussed herein,while the influencing laws of the main mechanical parameters of the vertical prestressed anti-slide pile are analyzed as well.Through the methods of eccentricity calculation and the differential approximation around curve,the checking calculation for the bearing capacity design and the formula for calculating the stress and deformation of the pile structure are derived.The results show that the parabolic calculation model for the external load is more coincided with that during the engineering practice.When the parameters are constant,the bearing capacity is inversely proportional to the concentrated force of the external load and the distance of the sliding plane,while the displacement and its rotation angle are proportional to the reinforcement strength.The vertical prestress of the pile body layout enhances the anti-bending performance of the pile structure and suppresses the deformation of the anti-slide pile.Afterwards,the calculated deformation effects obtained from both the formula and the model are quantitatively compared and analyzed,from which it is indicated that the structure of the vertical prestressed anchor cable is better than the common structure of both the vertical prestressed anchor cable and the reinforcement by 16.2%and 14.2%respectively,while it is obtained that the value from the calculation formula is slightly larger than that from the model deformation algorithm and the deviation rates of the algorithms for both the design structures by 5.7%and 7.5%respectively.The study results can provide theoretical references for the similar project concerned.

关 键 词：梯形抗滑桩 计算模型 计算公式 受力特征 影响规律 

分 类 号：U417.1[交通运输工程—道路与铁道工程]