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。
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。
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。
With the emergence of the high-rise construction and the underground project, the quantity of deep foundation pit excavation project rapidly increases.
高层建筑以及地下工程不断涌现，深基坑工程数量迅速增多。
Construction of various urban underground engineering, deep-buried tube work, large span highway (railway) tunnel are greatly improving tunnel construction technology.
一系列的城市地下工程、深埋管道工程、大跨度公(铁)路隧道的修建，大大促进了隧道施工技术的进步。
Construction of various urban underground engineering, deep-buried tube work, large span highway (railway) tunnel are greatly improving tunnel construction technology.
一系列的城市地下工程、深埋管道工程、大跨度公(铁)路隧道的修建，大大促进了隧道施工技术的进步。
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