60 m水深中抛填土体的密度怎么测

Density measurement method of dumped soil in 60 m water depth

三峡枢纽二期围堰工程是极具挑战性的一项土建工程,高90 m,需在60 m水深中抛填风化砂出水,再干填30 m,中间还要打两道混凝土防渗墙挡水。深水中抛填土的密度是一个最基本的设计参数,但限于当时(上世纪80年代)技术水平,无法得知该密度值,影响了工程进展。后来采用刚建成的我国第一台大型离心机用60 cm水深在100 g加速度下获得的数据进行设计,经后来验证,其值与实际密度符合良好。这在国内外还是第一次,也是离心试验在大型工程中应用的一次成功实践。

The second phase cofferdam project of the Three Gorges Project is a challenging civil engineering project which requires machines and tools for project execution.It is a 90 m high,and is filled with weathered sand to discharge water in a water depth of 60 m,and then dry filled for 30 m.Two concrete cut-off walls should be built to retain water in the middle.The density of dumping fill in deep water is the most basic design parameter,but limited to the technical level at that time(1980s),the density value was not known,which affected the progress of the project.Later,the newly built first large centrifuge in China was designed with the data obtained from the water depth of 60 cm and the acceleration of 100 g.It is verified that the value is in good agreement with the actual density.This is the first time at home and abroad,and it is also a successful practice of centrifugal test in large-scale engineering.