论文部分内容阅读
一大坝水平裂缝现场工作的长期实践,使我们初步掌握了混凝土大坝表面裂缝的规律。在坝体表面裂缝中有竖向裂缝与水平裂缝,两者的成因是不同的。前者是由气温骤降引起,即日平均气温的突变造成的。它主要出现在早龄期,是从坝块顶部开始裂起的,即使在我国南方地区建坝,因也有气温骤降,这种裂缝也常常发生。只有减少坝块表面降温梯度,采取连续浇筑和表面保护措施才能防止或减少裂缝发生。然而水平裂缝不同于前者,它主要是由坝块内外温差引
The long-term practice of a dam horizontal crack site work, so that we initially mastered the law of surface cracks in concrete dams. There are vertical cracks and horizontal cracks in the surface cracks of the dam, the causes of the two are different. The former is caused by a sudden drop in temperature, a sudden change in the average daily temperature. It mainly occurs in the early age and starts to crack from the top of the dam. Even if the dam is built in the southern part of our country, there is also a sudden temperature drop, and such cracks often occur. Only by reducing the cooling gradient on the dam surface, continuous pouring and surface protection measures can prevent or reduce the occurrence of cracks. However, the level of cracks is different from the former, which is mainly caused by the temperature difference inside and outside the dam