摘要
蓄水后坝踵压应力增长不是个别大坝特有的现象,其原因可能与水头、灌浆、温度、坝高(指施工期坝体上升)以及湿胀等因素有关,这些因素相互影响,增加了分析工作的困难,特别不易单独分离出湿胀变形及其变化规律。白水峪大坝排除了其他因素的影响,是研究湿胀变形的一个典型实例。根据湿胀变形的机理,文中论述了应变计与相应的无应力计测得的湿胀变形是有差异的；提出了描述其过程的“湿胀函数”；采用逐步回归法定量分析了这种影响。比较圆满地解释了大坝坝踵压应力增长的现象,对湿胀变形的研究是一次有意义的尝试。
The increase of the stress of the dam heel after water storage is not an individual phenomenon. It is possibly related to the water head, grouting, temperature, height and wet-expansion of the dam. These factors affect each other, so it is difficult to distinguish wet expansion deformation and find out its regularity. The baishuiyu dam is a typical example for the study of wet-expansion deformation, because other factors are removed. According to the mechanism of wet-expansion deformation, the wet expansion deformation measured by strain meters is proved to be different from the one measured by corresponding stressless meters. A wet expansion function is proposed to describe the process of deformation. And the regression method is used to analyze the impact. The increase of the stress of the dam heel is explained satisfactorily. The present study is a significative attempt for the study of wet-expansion deformation.
出处
《水电自动化与大坝监测》
2006年第2期58-60,共3页
HYDROPOWER AUTOMATION AND DAM MONITORING
关键词
坝踵
应力
湿胀变形
dam heel
stress
wet-expansion deformation
