【作者】 张怀文；

【导师】 高全臣；

【作者基本信息】 中国矿业大学（北京） ， 岩土工程， 2013， 博士

【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。更多还原

【Abstract】 Based on the construction of new Chengdu Museum,deformation properties and behavior mechanism of strengthened pile-anchor structure for permanent supporting foundation pit are ob-tained in this article using method of beam-structur FEM and equivalent-beam method. The research process covered foundation pit excavation, normal service condition, earthquake condition.In this article,the beam fern structural model and equivalent-beam model are established, and through de-signing optimization, technical parameters of pile-anchor structure are gotten.A FLAC3D model is built nextly.the above conditions are carefully verified again.At last,according to the monitoring data and calculation raeaults,it takes the result that the strengthened pile-anchor structure can assure the pit safety with meeting requirement of stability coefficient over2.0, anchor rod tension resistance coefficient over2.0, load coeffciency over1.25and the importance coefficient of safety engineering over1.1.更多还原