地下室混凝土挡墙开裂机理研究  

Research on the Cracking Mechanism of Concrete Basement Retaining Walls

作　　者：高文艺 聂晓鹏 陈尚伟 石文凤 GAO Wenyi;NIE Xiaopeng;CHEN Shangwei;SHI Wenfeng(Guizhou Zhongjian Architectural Research and Design Institute CO.,Ltd.,Guiyang 550003,China;Guizhou Architectural Science Research and Testing Center,Guiyang 550003,China)

机构地区：[1]贵州中建建筑科研设计院有限公司,贵州贵阳550003 [2]贵州省建筑科学研究检测中心,贵州贵阳550003

出　　处：《绿色建筑》2024年第3期147-152,共6页Green Building

基　　金：中国建筑土木工程材料重点实验室“基于图像识别的智能化检测方法研究与应用”(CSCEC4B-2022-KTA-7);“机制砂高韧性混凝土的配制与抗震加固研究”(CSCEC4B-2022-KTA-6)。

摘　　要：地下室混凝土挡墙开裂在工程中较为常见,但其开裂机理尚未完全厘清。以某地下室混凝土挡墙开裂为案例,对其挡墙裂缝进行了外观检测并取样进行了碳化深度检测;复核实际工程表明挡墙厚度和混凝土强度符合设计要求,配筋指标基本符合设计要求;此外,对组成混凝土的原材料对开裂的影响进行了对比分析,表明比表面积越大的水泥,其混凝土早期开裂更严重;混凝土强度富裕系数高,不利于混凝土的抗裂。分析试验结果表明混凝土收缩是造成地下室混凝土挡墙开裂的主要原因,为挡墙开裂的机理研究提供借鉴与参考。Cracking in concrete basement retaining walls is a common occurrence in engineering,yet there is still a lack of comprehensive understanding of its mechanism.In light of that,a case study was conducted on the cracking of a concrete basement retaining wall to investigate the external crack appearance and collect samples for carbonation depth testing.The composite analysis of the actual project indicates that the thickness and concrete strength of the retaining wall meet the design requirements,and that the reinforcement index generally conforms to the design specifications.Furthermore,a comparative analysis of the impact of raw materials composition for the concrete on cracking was conducted.The results indicate that cement with a larger specific surface area leads to more severe early cracking to the concrete.Moreover,further analysis trial suggests that a high concrete strength surplus coefficient is unfavorable for crack resistance,and that concrete shrinkage is the primary cause of cracking in the concrete basement retaining walls,which provides a reference for the research on the mechanism of retaining wall cracking.

关 键 词：地下室混凝土挡墙 开裂机理 挡墙裂缝 比表面积 

分 类 号：TU755[建筑科学—建筑技术科学]