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为及时预报井下采掘中出现的断层,西德引用了立体摄影测量技术,进行井下构造裂隙统计规律的研究。1972年开始在鲁尔矿区布鲁门他尔矿进行井下试验,首先取得井下构造立体摄影统计数据。经过1975—1977
In order to timely predict the fault occurred in the underground excavation, West Germany cites stereographic measurement techniques to study the statistical rules of underground structural fractures. The Burlingame mine in the Ruhr area began its downhole test in 1972. First of all, 3D statistical data of underground structures were obtained. After 1975-1977