【摘要】 为了研究施工过程中混凝土龄期弹性模量变化对泵站底板及桩土地基受力特性的影响，首先以变形协调方程为理论基础，阐述了底板施工过程中底板应力重分布规律和混凝土龄期弹性模量变化对桩土地基荷载分担的影响；然后以某桩土复合地基泵站工程为例，利用Midas/GTS NX软件建立了泵站和桩土地基的三维有限元模型，并通过监测数据验证了模型的有效性；最后通过数值模拟的方法分析了施工过程中混凝土龄期弹性模量变化对泵站底板沉降和桩土地基荷载分担比的影响.结果显示：底板施工完成工况下，考虑混凝土龄期弹性模量变化的泵站底板最大沉降和单位面积地基土承担的平均荷载比不考虑混凝土龄期弹性模量变化的泵站底板最大沉降和单位面积地基土承担的平均荷载分别高出了91.53%、16.41%；泵站上部结构施工完成工况下，考虑混凝土龄期弹性模量变化的泵站底板最大沉降和单位面积地基土承担的平均荷载比不考虑混凝土龄期弹性模量变化的泵站底板最大沉降和单位面积地基土承担的平均荷载分别高出了27.81%、15.09%；数值模拟结果表明，混凝土龄期弹性模量变化对泵站底板及桩土地基受力特性均有不同程度的影响.更多还原

【Abstract】 The purpose of this paper is to study the influence of concrete age elastic modulus change on the mechanical characteristics of pump station floor and pile soil foundation in the construction process. Firstly,based on the theory of deformation coordination equation,the stress redistribution rule of floor and the influence of concrete age elastic modulus change on the load sharing of pile soil foundation during the floor construction process are expounded.Then,with a pile-soil composite foundation pump station project as an example,Midas/GTS NX software is used to establish the three-dimensional finite element model of the pump station and pile-soil foundation,and the effectiveness of the model is verified by monitoring data. Finally,the influence of concrete age elastic modulus change on the floor settlement and pile-soil foundation load sharing ratio of pumping station is analyzed by numerical simulation method.The results show in the condition of the floor construction completed,the maximum settlement of the floor and the average load borne by foundation soil per unit area of the pumping station with considering concrete age elastic modulus change are 91.53% and 16.41% higher than that without considering concrete age elastic modulus change,respectively. In the condition of the pump station superstructure construction completed,the maximum settlement of the floor and the average load borne by the foundation soil per unit area of the pumping station with considering concrete age elastic modulus change are 27.81% and 15.09%,higher than that without considering concrete age elastic modulus change. The numerical simulation results show that the concrete age elastic modulus change has different degrees of influence on the mechanical characteristics of pump station floor and pile soil foundation.更多还原