隔震建筑深基坑永久支护体系设计及其作用机制研究

发布时间：2018-04-10 08:25

本文选题：深基坑　切入点：永久支护　出处：《中国矿业大学（北京）》2013年博士论文

【摘要】：本文依托成都博物馆新馆基坑工程,针对永久性桩锚支护结构,采用杆件有限元法和等值梁法联合设计的方法,研究了大刚度桩锚支护结构的力学性状与变形特征。研究内容涵盖了基坑开挖阶段、正常使用阶段、地震发生阶段三个工况。首先在基坑开挖阶段建立杆件有限元模型和等值梁法模型,通过优化设计,确定了永久支护结构的技术参数。其次利用FLAC软件建立三维数值分析模型,验证了基坑开挖工况、地下水恢复工况数值模型的稳定特征。最后输入地震荷载,模拟计算模型的动力反应,获得了静动力作用下永久支护结构的力学变形特性曲线。通过设计计算结果与实际监测数据对比,确定了满足整体稳定安全系数≥2.0,锚杆抗拉安全系数≥2.0,荷载分项系数=1.25,工程重要性系数=1.1的桩锚支护结构在七度抗震设防烈度下的永久性的安全性。
[Abstract]:In this paper, based on the foundation pit engineering of the new museum of Chengdu, the mechanical properties and deformation characteristics of the pile anchor support structure with large stiffness are studied by using the method of finite element method and equivalent beam method, aiming at the permanent pile-anchor support structure.The research covers three working conditions: excavation stage, normal use stage and earthquake occurrence stage.Firstly, the finite element model and equivalent beam model are established in the excavation stage of foundation pit, and the technical parameters of permanent support structure are determined by optimizing design.Secondly, a three-dimensional numerical analysis model is established by using FLAC software, which verifies the stability characteristics of the numerical model of foundation pit excavation and groundwater recovery.Finally, the dynamic response of the model is simulated by inputting the seismic load, and the mechanical deformation characteristic curve of the permanent supporting structure under static and dynamic action is obtained.By comparing the results of design and calculation with the actual monitoring data,
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU473.2

【参考文献】