大粒径粗粒坝料填筑标准的确定及施工控制

我国近期颁布的设计规范,对土石坝的无粘性粗粒坝料的要求是以相对密度确定其填筑标准。但是从国内外土石坝建设的实践来看,要满足上述要求,尚存在许多问题。诸如相对密度试验方法的归一化及其理论依据;大粒径材料相对密度的确定方法;相对密度实用误差的分析;代表性级配模型的置信水平以及施工控制中的有关问题等。本文结合石头河土石坝的工程实践,对连续级配材料的上述问题进行了探讨。

Determination of Filling Criteria of Large Grain-size Coarse Materials for Dam and Construction Control

According to the specification recently promulgated, it is required to determine filling criteria of incoherent coarse grain materials on the basis of their relative density. But in the light of the construction of earth rockfill dams at home and abroad, there are a series of problems to be solved in carrying out the requirements stipulated in the specification, such as the testing method of relative density of the coarse materials, the standardization of the method and its theoretical basis, method for determination of the relative density of the materials, method of analysis of practical errors, the confidence level of the representative model of gradation of the materials and some problems in the construction work concerning this material, etc.In this paper problems about continuous grading material as mentioned above are studied.