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地下构筑物自古就有。远在两千年前的西汉,我国劳动人民建造的两座古墓,上复200米厚的石灰岩,无任何支护措施,建筑容积达3000米~3,最大跨度达37米以上。明代于北京北部建造的十三陵(其中:定陵的地下建筑面积达1196米~2),建造艺术之高,工程量之大是中外闻名的。第二次世界大战前,世界上仅有几十座大型地下构筑物,但到第二次世界大战后已达数百座。同时这些结构的跨度已达到了44
Underground structures have existed since ancient times. As far back as two thousand years ago, two ancient tomb built by working people in our country built 200 meters of limestone without any support measures. The building volume reached 3,000 to 3 with a maximum span of 37 meters. The Ming Dynasty built in the northern part of Beijing Ming Tombs (including: Dingling underground construction area of 1196 m ~ 2), the construction of art high, the amount of engineering is famous. Before the Second World War, there were only a few dozen large underground structures in the world, but it has reached hundreds after World War II. At the same time, the span of these structures has reached 44