Abstract
The underground continuous wall originated from Europe. Since it was first used in the construction of a reservoir dam in Italy at the year of 1950, the underground continuous wall has made rapid progress. The underground continuous wall was first applied in water resources and hydropower engineering around the world, then extended to the construction, municipal, transportation, mines, railways and environmental protection departments. The initial thickness of the underground continuous wall is generally not more than 0.6 m and the depth is not more than 20 m. By 1980s, with the improvement of technical equipment, the technology developed rapidly. In this period, the underground continuous wall with a thickness of over 1.2 m and a depth beyond 100 m was constantly emerging. And there was the underground continuous wall with ultra-thickness and ultra-depth by 1990s.
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