苏州滨湖新城地下空间早龄期侧墙结构混凝土变形开裂研究

Research on the Deformation and Cracking of Early-Age Sidewall Structure Concrete in Suzhou Binhu New City Underground Space Project

地下工程结构中超长连续墙体的体积变形和开裂是化学、水化、热学以及力学等多因素变化共同耦合作用的结果。基于"水化-温度-湿度-约束"多场耦合模型,采用三维有限元方法,结合混凝土热、力学参数试验测试结果,计算研究了苏州滨湖新城地下空间超长侧墙实体结构混凝土温度、应变与应力发展过程,评估了其开裂风险随龄期变化情况及补偿收缩混凝土应用效果,为后续实际工程的开展奠定了基础。

The early-age volume deformation and cracking of super-long sidewall structure concrete in underground project is the result of the concerted action of multi-factors containing chemical, hygral, thermal and mechanical changes. In this paper, based on the multi-field（hygro-thermo-chemo-mechanical） coupling model, three dimensional finite element method was adopted to study the temperature, strain and stress development history and cracking risk of the super-long sidewall structure concrete in Suzhou Binhu New City Underground Space project. At the same time, the application effect of shrinkage-compensating concrete was evaluated. All of these simulation results established the foundation for the subsequent projects..