早在三十年代,法国、美国就用石膏作结构模型.目前国内各水工结构模型试验室已普遍用石膏制作大坝结构模型,但在使用中常出现均匀性不够的问题.根据我们多次试验资料统计,发现在同一模型或同一块试件上弹模差值有时可达±(20～30%).为了提高结构模型试验的精度,我们对引起石膏不均匀的原因以及提高石膏均匀性的措施进行了一些摸索,现整理于后,供研究参考. As early as in the thirties, France and the United States used gypsum as a structural model. Currently, various hydraulic structure model laboratories in China have generally used gypsum to make dam structure models, but there are often problems of insufficient uniformity during use. According to our many times Test data statistics, found that in the same model or the same specimen on the difference between the elastic modulus can sometimes reach ± ​​(20 ~ 30%). In order to improve the accuracy of the structural model test, we cause the cause of uneven plaster and improve the uniformity of the gypsum The measures were followed by some groping and are now collated for research reference.