整体砌石重力坝运行期温度作用效应

Temperature action effect of monolithic masonry gravity dam in operation period

重力坝因设置温度伸缩缝及体型较厚不需要考虑温度作用,而拱坝因不设永久性伸缩缝及体型较薄需要考虑温度作用.整体砌石重力坝由于其结构、施工和材料的特殊性,使它的特性介于重力坝和拱坝之间,存在能不能忽略温度作用效应的问题,这方面的研究较少,在规范中也未具体说明.基于此,运用拱坝温度荷载的计算方法以及等效模量法,对川南地区的狸狐洞整体式砌石重力坝工程实例进行有限元分析,分别探讨了温度场和温度应力场的数值大小和分布,得出了一般整体式砌石重力坝在运行期温度作用下的温度场和温度应力的规律,表明整体砌石重力坝运行期的温度作用效应较大.

Gravity dams need not to consider the temperature action because of setting temperature expan- sion joint and having thick body; by contrast, arch dam should consider the temperature action because it has no everlasting temperature expansion joint and has thin body. Because of the particularity of the struc- ture,construction and materials, the characteristics of monolithic masonry gravity dam is between gravity dam and arch dam, so that it has the problem whether it should ignore temperature action effect. Mean- while, the research in this area is less and the standard is not specified. By using the calculation method of temperature load on arch dam and the method of equivalent modulus, the Lihudong monolithic masonry gravity dam in southern Sichuan is presented for the finite element analysis; and the law of temperature field and temperature stress of ordinary monolithic masonry gravity dam under temperature action in opera- tion period are obtained with discussing the numerical size and the distribution of temperature field and temperature stress field; and it is shown that the temperature action effect of monolithic masonry gravity dam in operation period is obvious.