导流洞二次衬砌混凝土抗裂性提升技术研究  

Research on crack resistance technology of secondary lining concrete of diversion tunnel

作　　者：潘利 徐文 王育江 薛峰 PAN Li;XU Wen;WANG Yujiang;XUE Feng(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,Jiangsu,China)

机构地区：[1]江苏苏博特新材料股份有限公司高性能土木工程材料国家重点实验室,江苏南京211103

出　　处：《水利水电技术》2020年第12期92-98,共7页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目(2017YFB0310100)。

摘　　要：水电工程中混凝土裂缝控制是影响工程质量的关键技术,导流洞二次衬砌作为易开裂部位之一,亟需开展混凝土抗裂性提升技术研究。以西南某水电站工程为例,对其导流洞边墙二次衬砌混凝土进行实体结构监测,研究其温度/变形变化规律。使用高效抗裂剂提升二次衬砌混凝土抗裂性能,抗压强度、自生体积变形、模拟实际工况温度变形等试验结果表明,高效抗裂剂能够满足混凝土强度要求同时提升其体积稳定性,有利于混凝土抗裂性能提升。采用数值模拟的方法对二次衬砌混凝土进行开裂风险评估,结果表明高效抗裂剂能有效降低混凝土开裂风险,研究成果也为相关工程提供了良好的借鉴意义。Concrete crack control is a key technology that affects the quality of hydropower projects. As one of the easily cracked parts, it is urgent to carry out research on the crack resistance of the secondary lining concrete. Taking a hydropower station in Southwest as the study case, the temperature and deformation in the secondary lining concrete of the diversion tunnel are monitored. Using high-efficiency anti-crack agent to improve the crack resistance of secondary lining concrete and the compressive strength, autogenous volume deformation, deformation at simulate actual temperature have been studied. The results show that the high-efficiency anti-crack agent can meet the strength requirements and improve the volume stability of the concrete, which is beneficial to the crack resistance of the concrete. The numerical simulation method is used to evaluate the cracking risk of secondary lining concrete, which shows that the use of high-efficiency anti-cracking agent can effectively reduce the cracking risk of concrete. The research results can provide some reference for the similar projects concerned.

关 键 词：二次衬砌混凝土 实体监测 高效抗裂剂 开裂风险 

分 类 号：TU528[建筑科学—建筑技术科学]