堆石体灌水法密度试验薄膜探讨

The Effect of Membrane Thickness on the Density Measurement by Water Filling Method for the Rock Fills

目前,我国堆石坝技术已较为成熟,堆石体是筑坝和围堰结构的重要组成部分,而碾压方式下堆石体的干密度是影响坝体变形的主要因素,也是大坝填筑质量的主要控制指标之一。现场常采用挖坑灌水法来测定其填筑的密实度,挖坑灌水法原理简单,操作简便,但要测定准确却非常困难,且薄膜厚度对测定结果也存在一定影响,现介绍某工程采用挖坑灌水法测定堆石体填筑密度过程中,采用两种厚度薄膜进行试验比对的工程经验。

The rock fill dam construction becomes a matured construction technology in China. The rock fills is an important part of dam body and cofferdam structures. The rock-fill density under different compaction methods might potentially affect the deformation of the constructed dam. Therefore, the density of the rock fill material is one of the major controlling factors for in the dam construction. The in-situ density tests are usually measured by the water filling method. Although this method is easy to operate, it is difficult to obtain an accurate measurement. Further, the membrane thickness might potentially affect the test results. This paper presents the experience on the density measurements by using two different plastic membranes.