【作者】 令永强； 宋雷； 周勇； 杨校辉； 柳伟；

【Author】 LING Yongqiang;SONG Lei;ZHOU Yong;YANG Xiaohui;LIU wei;State Key Laboratory of Intelligent Construction and Healthy Operation & Maintenance of Deep Underground Engineering;Yunlong Lake Laboratory of Deep Underground Science and Engineering;School of Architecture and Engineering, Shanghai Zhongqiao Vocational and Technical University;School of Civil Engineering, Lanzhou University of Technology;

【机构】 深地工程智能建造与健康运维全国重点实验室； 深地科学与工程云龙湖实验室； 上海中侨职业技术大学建筑工程学院； 兰州理工大学土木工程学院；

【摘要】 桩锚支护结构在基坑工程中应用日益广泛,支护结构水平位移直接影响着支护结构的整体稳定性,如何精确计算桩锚支护结构水平位移显得尤其重要。本文首先将多锚支护结构锚杆预应力以土体中附加应力的形式考虑计算支护结构的水平位移;其次,建立桩锚支护结构水平位移计算模型,选择典型基坑工程实例,将其参数代入依据推导公式编写的编程,采用弹性变形叠加法,计算出桩锚支护结构水平位移;第三,结合现行通用设计软件和有限元分析软件进行对比验证。结果表明:1)提出了一种通过附加应力计算桩锚支护结构水平位移的方法,并给出了考虑预应力因素的支护结构水平位移计算算法,计算结果与实际基坑工程水平位移监测结果相近,证明该算法切实可行;2)支护结构水平位移计算数据与有限元分析软件数据相比,更加贴近现场检测数据,该算法适用于一般土质的桩锚支护结构水平位移计算;3)支护结构水平位移与锚杆预应力呈非线性关系。更多还原

【Abstract】 The Pile-anchor supporting structure is widely used in foundation pit engineering. The horizontal displacement of supporting structure directly affects the overall stability of supporting structure. How to accurately calculate the horizontal displacement of pile-anchor supporting structure is particularly important. In this paper, the anchor prestress of the multi-anchor support structure is considered in the form of additional stress in the soil to calculate the horizontal displacement of the support structure. Secondly, the horizontal displacement calculation model of pile-anchor supporting structure is established. The typical foundation pit engineering example is selected, and its parameters are substituted into the programming based on the derivation formula. The horizontal displacement of pile-anchor supporting structure is calculated by elastic deformation superposition method. Third, combined with the current general design software and finite element analysis software for comparative verification. The results show that: 1) The anchor prestress is used to calculate the horizontal displacement of the pile-anchor supporting structure in the form of additional stress, and an algorithm for calculating the horizontal displacement of the supporting structure considering the prestress is given. 2) Compared with the data of finite element analysis software, the horizontal displacement calculation data of supporting structure is closer to the spot data. The algorithm is suitable for the horizontal displacement calculation of pile-anchor supporting structure of general soil. 3) There is a nonlinear relationship between the horizontal displacement of the supporting structure and the prestress of the bolt.更多还原