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苏联有用矿物的地下总开采量和地下建筑工程规模,一直稳居世界首位,毫无疑问,将来也必定会保持这样的地位。由于岩层的不稳固、多裂隙和含水,而在某些情况下由于有毒气体和有爆炸危险气
The total underground exploitation of useful minerals in the Soviet Union and the scale of underground construction projects have consistently ranked first in the world. There is no doubt that such a position will surely remain in the future. Due to the instability of the rock formation, multiple fractures and water, in some cases due to toxic gases and explosive gas