In 1959, the RAND Corporation held several conferences on Deep Underground Construction.

1959年，兰德公司在对深地下施工方面﹐举行了多次会议。

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As the exploitation of underground space and the construction of high-rise in urban, a large number of deep foundation excavations have appeared lately. Its scale and depth increase constantly.

在城市地下空间开发和高层建筑物的建设过程中，产生了大量深基坑工程，其规模和深度不断增加。

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A reasonable excavation procedure and contour blasting method is one of the key techniques for construction of deep underground powerhouse.

合理的开挖程序和轮廓爆破方式是深埋地下厂房施工中的关键技术之一。

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Engineers who have assessed the project to build deep underground storage facilities feel it would be a bigger construction challenge than that of the channel tunnel, with tunnelling between 200 and 1, 000 metres.

BBC: Nuclear waste disposal: Where in Cumbria to bury it?