补偿收缩混凝土在明挖暗埋隧道矩形框架结构中的应用研究

The Study on the Application of Expansive Concrete in the Rectangular Frame Structure of Cut and Cover Tunnel

为解决矩形框架结构的明挖暗埋隧道中混凝土结构裂缝和渗漏水问题,提出采用补偿收缩混凝土来提高结构抗裂性能的思路,介绍了补偿收缩混凝土矩形框架结构内力和变形计算方法和其配合比设计.对依托工程的计算结果显示,采用补偿收缩混凝土后,隧道结构的弯矩减小、轴力提高、偏心矩减小,抗裂性能明显提高.

To solve the problems of concrete structure crack and leakage in rectangular frame structure of cut and cover tunnel, the idea to improve the anti-cracking ability in structure by means of shrinkage compensating concrete technology is adopted. Then, the structure internal force and deformation calculation method for shrinkage compensating concrete rectangular frame and the design of mixture ratio are introduced. The support construction calculation results show that the bending moment of tunnel structure is decreased, the axial force is enhanced, the eccentricity is minimized and the anti-crack property is obviously improved by the application of shrinkage compensating concrete.