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一、南大口井地质情况介绍及施工季节特点: 海军三院大口井座落在北京长辛店西侧永定河河床,沉井直径9米,为不完正型大口井,共两座,北井已于1973年完成,出水情况良好,每小时出水量1千吨。南大口井设计高程比北井低1米结构和做法完全相同,地质情况则差别很大。全井总下沉量为20米开始由地面挖8米右左的深坑,1972年冬预制混凝土井筒高度为14米,后于1977年八月14日开始沉井到1978年2月10日沉完实际沉降量为14.6m沉井历时五个月。南井的地质情况比较单纯,从地面
I. Introduction to the Geological Conditions of Nandaikou Well and the Characteristics of Construction Season: The Naruto Sanyuan Well is located in the riverbed of the Yongding River on the west side of the Beijing Changxindian. The well is 9 meters in diameter and is an unfinished large well with two wells. It was completed in 1973 and the water output was good. The amount of water discharged per hour was 1 kiloton. The design elevation of the Nankai Well is one meter lower than that of the North Well, and the geological conditions are very different. The total depth of the well was 20 meters. A pit of 8 meters from the ground was dug. The height of the precast concrete shaft in winter of 1972 was 14 meters. Then it began to sink in August 14, 1977, and sank in February 10, 1978. After the actual settlement of 14.6m caisson lasted for five months. The geological condition of Nanjing is relatively simple, from the ground