基于反演分析的大体积混凝土电梯井基础温控研究  

Research on Temperature Control of Mass Concrete Elevator Shaft Foundation Based on Inversion Analysis

作　　者：崔野 CUI Ye(China Railway 20th Bureau Group Sixth Engineering Co.Ltd.,Xi’an Shaanxi 710032,China)

机构地区：[1]中铁二十局集团第六工程有限公司,陕西西安710032

出　　处：《铁道建筑技术》2023年第8期98-102,共5页Railway Construction Technology

基　　金：中铁二十局集团有限公司科技研发项目(YF1806FJ38C)。

摘　　要：超高层建筑基础大体积混凝土温缩裂缝是施工难点与质量控制重点。但工程种类、结构形式、施工环境等差异导致无法形成统一的施工工艺。通过数值模拟预测温度应力场,结合现场监测与动态养护是解决这一问题的有效措施。然而数值模拟计算参数精度又限制了这一方法的工程应用推广。针对该问题,本文基于某大体积混凝土电梯井基础施工,提出采用现场模型试验结合参数反演分析的方法进行模拟参数标定,从而实现大体积混凝土温度应力场的准确预测。模型试验与实际工程采用相同混凝土配比、类似结构形式与施工环境,因而对其监测结果反演分析所得计算参数能够最大程度还原实际情况。将所述方法应用于实际工程,在预测结果分析的基础上进行大体积混凝土基础浇筑方案设计,高效实现了无裂缝施工。本研究结果可为大体积混凝土施工与裂缝控制提供新思路。Mass concrete thermal cracking in the foundation of super high-rise buildings are construction difficulties and quality control priorities.However,differences in engineering types,structural forms,and construction environments have led to the inability to form a unified mass concrete construction process.Predicting the temperature stress field through numerical simulation,combined with on-site monitoring and dynamic maintenance,is an effective measure to solve this problem.However,the accuracy of numerical simulation calculation parameters limits the engineering application and promotion of this method.In response to this issue,this article was based on the construction of a mass concrete elevator shaft foundation to propose the use of on-site model testing combined with parameter inversion analysis for simulation parameter calibration,in order to achieve accurate prediction of the temperature stress field of mass concrete.The model test and actual engineering used the same concrete ratio,similar structural form,and construction environment,so the calculation parameters obtained from the back analysis of the monitoring results can maximize the restoration of the actual situation.The proposed method was applied to practical engineering,and based on the analysis of predicted results,a mass concrete foundation pouring scheme was designed to achieve crack free construction efficiently.This study can provide new ideas for the construction and crack control of mass concrete.

关 键 词：大体积混凝土 模型试验 反演分析 裂缝控制 

分 类 号：TU470.3[建筑科学—结构工程] TU528.01[建筑科学—土工工程]