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1933年,四川叠溪大地震,在岷江上游干流上,形成了一座天然堆石坝,其坝高155米,水库水深80米、坝面溢流。几十年来,大海子天然坝不倒不漏安全稳定,引起了水利部门的注意,曾多次进行了考察。1960年,为配合南水北调西线峡谷高坝的规划,我们与有关部门协作,再次进行了考察。这次考察是迄今较全面的一次,除进行了天然坝体考察外,还进行了库区淤积、库区三角洲物探测量等多方面的工作, 取得了大量科学数据。限于篇幅,本文仅就大海子天然坝的概况、坝体结构及其稳定特性,做一简要介绍,供有关方面参考。
In 1933, a massive natural rockfill dam was formed on the upper stream of the Minjiang River in Diexi, Sichuan Province. The dam height is 155 meters and the reservoir depth is 80 meters. The dam surface overflows. For decades, Da Haizi natural dam did not fail to leak safety and stability, causing the attention of the water conservancy department, has repeatedly conducted a study. In 1960, in line with the planning of the high dam of the Western Route Canyon in the South-to-North Water Diversion Project, we conducted another inspection in collaboration with relevant departments. This visit is by far the most comprehensive one. In addition to the natural dam inspection, siltation in the reservoir area and geophysical survey in the reservoir area have been carried out. A great deal of scientific data have been obtained. Due to space limitations, this article only on the overview of the natural dam, the dam structure and stability characteristics, make a brief introduction for the relevant reference.