筏板基础大体积混凝土水化热模拟分析

Simulation Analysis of the Hydration Heat of the Mass Concrete of Raft Foundation

大体积混凝土硬化过程中会放出大量热量形成温度裂缝,影响结构的安全性和耐久性。依托深圳市皇岗口岸站深基坑筏板工程,通过MIDAS/FEA对大体积混凝土筏板浇筑后的温度变化和热应力情况进行数值分析,对比研究不同浇筑方式对大体积混凝土水化热的影响。研究结果表明:分段分层斜面浇筑可有效降低大体积混凝土早期温升,控制表面裂缝的产生。

A large amount of heat will be released to form temperature cracks during the hardening process of mass concrete,which will affect the safety and durability of the structure.Based on the raft project of deep foundation pits at the Huanggang Checkpoint Station in Shenzhen,the temperature change and thermal stress of mass concrete rafts after pouring are numerically analyzed by MIDAS/FEA,and the influences of different pouring methods on the hydration heat of mass concrete are compared and studied.Results show that the segmented layered beveled pouring can effectively reduce the early temperature rise of mass concrete and control the generation of surface cracks.