大角度斜拉桩计算方法及工程应用  

Calculation Method and Engineering Application of Large-angle Cable-stayed Pile

作　　者：王振 张祥恒 苟家满 陈柏林 WANG Zhen;ZHANG Xiangheng;GOU Jiaman;CHEN Bolin(China Ordnance Industry Survey and Geotechnical Institute Co.,Ltd.,Beijing 100000,China;No.3 Exploration Institute of Geology and Mineral Resources of Shandong Province,Yantai 264000,Shandong,China;Technology Innovation Center of Geohazards Automatic Monitoring,Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources),Chongqing 401120,China)

机构地区：[1]中兵勘察设计研究院有限公司,北京100000 [2]山东省第三地质矿产勘查院,山东烟台264000 [3]自然资源部地质灾害自动化监测技术创新中心(重庆地质矿产研究院),重庆401120

出　　处：《路基工程》2023年第5期172-177,共6页Subgrade Engineering

基　　金：重庆市自然科学基金面上项目(CSTB 2022NSCQMSX1466);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX1618)。

摘　　要：针对现有预应力锚索抗滑桩使用空间受限的情况,提出一种大角度斜拉桩,结合Winker弹性地基梁理论和弹性支座法,为其建立力学计算模型。用桩锚变形协调条件,推导锚索拉力计算公式,并将抗滑桩从滑面处分为上、下两部分,滑面以上部分按结构力学方法计算,滑面以下部分按Winker弹性地基梁法计算。通过Matlab编程实现锚索拉力、桩身内力及位移计算结果输出。采用Optum G2软件建立数值模型对理论模型进行验证,结果表明:计算方法能准确反映桩顶大角度斜拉桩的受力、变形特点,计算结果的精确程度取决于地基系数选取的合理性与准确性。最后,以重庆某基坑边坡工程为例,与普通抗滑桩进行对比分析,计算结果表明:大角度斜拉桩受力模式更加合理,大角度斜拉锚索可有效减小桩身弯矩、剪力、位移等,进而减小桩身截面尺寸、配筋和嵌固段长度。Aiming at the limited use space of prestressed anchor cable anti-sliding piles,this paper proposes a large-angle cable-stayed pile.Combined with the winker elastic foundation beam theory and the elastic bearing method,a mechanical calculation model is built.The calculation formula of anchor cable tension is derived based on the deformation coordination equation of pile and anchor.The anti-slide pile is divided into upper and lower parts from the sliding surface,the upper part of the sliding surface is calculated by the method of structural mechanics,and the lower part of the sliding surface is calculated by the Winker elastic foundation beam method.Matlab programming is used to achieve the calculation results output of anchor cable tension,anti-slide pile internal force and displacement.Establish a numerical model to verify the theoretical model through Optum G2 software.The results show that the calculation method in this paper can accurately reflect the stress and deformation characteristics of the large-angle cable-stayed pile at pile top.The accuracy of the calculation results depends on the rationality and accuracy of the foundation coefficient selection.Finally,taking a foundation pit slope project in Chongqing as an example,a comparative analysis with ordinary anti-sliding piles is carried out.The calculation results show that the stress mode of the large-angle cable-stayed pile is more reasonable,and the large-angle cable-stayed cable can effectively reduce the bending moment of the pile body,shearing force,displacement,etc.so as to further reduce the section size of pile body,reinforcement and length of embedded section.

关 键 词：大角度 锚索 斜拉桩 抗滑桩 弹性地基梁 

分 类 号：TU43[建筑科学—岩土工程]