高拱坝横缝灌后二次张开现象成因及处理  

Causal analysis and treatment of secondary opening of transverse joint after grouting in high arch dams

作　　者：程立 武明鑫[1] 赵全胜[1] CHENG Li;WU Mingxin;ZHAO Quansheng(China Renewable Energy Engineering Institute,Beijing 100120,China)

机构地区：[1]水电水利规划设计总院,北京100120

出　　处：《人民长江》2022年第10期147-152,共6页Yangtze River

摘　　要：中国特高拱坝建设已领跑世界,但在部分特高拱坝建设中出现了横缝接缝灌浆后二次张开现象,二次张开的成因、影响及处理措施困扰着工程建设。调研了大岗山、杨房沟、锦屏一级等高拱坝建设过程中出现的横缝接缝灌浆后二次张开现象,并对横缝二次张开原因、处理措施及对拱坝安全影响等进行了分析和探讨。结果表明:高拱坝横缝接缝灌浆后,在未挡水或低水位时坝体处于不利的受力状态,横缝缝面压应力相对较小,受临近区域施工扰动、环境温度、自生体积变形等一种或多种因素影响会造成横缝二次张开;通过采取细磨水泥灌浆、化学灌浆等进行补灌,可达到理想的处理效果;水位抬高后,坝体拱向压应力增加,横缝受力状态得到改善,因此二次张开的横缝经补灌处理后并不影响拱坝长期运行安全。The construction of super-high arch dams in China has taken the lead in the world.However, in the construction of some super-high arch dams, the transverse joints usually open after grouting.The causes, effects and treatment measures of these openings trouble the project construction.The secondary opening phenomena of the joint after grouting in hydropower stations such as Dagangshan, Yangfanggou and JinpingⅠwere investigated, and the opening reasons, treatment measures and the safety impact on the arch dams were analyzed and discussed.The results show that after the joint grouting of the transverse joint, the dam body is in an unfavorable stress state when the water is not impounded or the water level is low, as the compressive stress on the transverse joint surface is relatively small.Affected by one or more factors such as construction disturbance, ambient temperature and autogenous volume deformation in the adjacent area, it will cause secondary opening.The ideal treatment effect can be achieved by adopting fine grinding cement grouting, chemical grouting and so on.After the water level raising, the arch compressive stress of the dam increases and the stress state of the transverse joint is improved.Therefore, it is concluded that the secondary openings of transverse joints do not affect the long-term operation safety of the arch dam.

关 键 词：高拱坝 横缝 二次张开 补强灌浆 施工扰动 

分 类 号：TV543[水利工程—水利水电工程]