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前言 在水电建筑中开凿地下隧洞工程,岩体“坍方”及它给施工带来困难是常见的。尽管如此,只要工程地质问题清楚、设计布置合理、施工方法恰当,还是可以克服的,国内外例子不少。然而,象碧口电站左泄无压段施工中,在1978年2月29日发生冒顶性大坍方,规模之大(方量大于4000立米),增加投资之多(初估1000多万元),延误工期之长(五年半有余),这在水电部门是罕见的,致使该项工程至今不能投入运行。付出如此巨大的代价换来的教训应是深刻的。本文就此作一粗浅的分析。
Preface It is not uncommon to dig underground tunneling projects in hydropower buildings, rock mass “landslides” and the difficulties it brings to construction. However, as long as the engineering geological problems are clear, the design layout is reasonable and the construction method is appropriate, it can still be overcome. There are many examples at home and abroad. However, as the BAKU No-Zhan No-pressure section construction, on April 29, 1978, there was a large-scale roof collapse with a large scale (an area of more than 4,000 cubic meters) and increased investment (initially estimated at over 10 million yuan) , A long delay period (more than five and a half years) is rare in the hydropower sector, rendering the project into operation so far. The lesson of paying such a huge price should be profound. This article made a superficial analysis of this.