摘要
高拱坝在施工过程中需要对地基进行固结灌浆,灌浆分为有盖重灌浆和无盖重灌浆2种,对于有盖重灌浆来说,钻孔极其容易将冷却水管损坏,水管损坏对混凝土后期温度应力影响较大.采用热流耦合精细算法对施工期混凝土的温度应力进行仿真分析,结果表明:水管损坏后,大坝混凝土无法进行通水冷却,在较长的一段时期内,混凝土温度呈现不同程度的回升或缓慢降温.当混凝土达到一定的龄期需要进行接缝灌浆时,混凝土的温度依然较高,影响接缝灌浆的质量.如果以较高的温度进行封拱灌浆,那么在大坝运行期遇到温降工况时会在坝体内部产生比较大的温度残余应力.
There need for consolidation grouting in the construction of high arch dam. There are two types of grouting： consolidation grouting with weight, consolidation grouting without weight. For consolidation grouting with weight, drilling is easy to damage the cooling water pipe. The damage of cooling water pipe has great impact on the late concrete temperature stress. The heat-fluid coupling finite element method is used to simulate the temperature stress of concrete during the construction period. The results show that due to the damage of water pipe, water cooling for the concrete dam is interrupted. So the temperature of concrete showed different degrees of recovery or slow cooling in a longer period. The high arch dam needs joint grouting when the concrete reaches a certain age. At this time, the concrete temperature is still high; so the quality of joint grouting is badly affected. If we do closure grouting at a high temperature, the inside of dam will produce relatively large temperature residual stress when the dam meet the temperature drop condition in operating period.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2017年第2期213-219,共7页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:51579192)
关键词
固结灌浆
水管损坏
热流耦合法
温度残余应力
consolidation grouting
pipe damage
heat-fluid coupling method
temperature residual stress
