Due to the weak surrounding rock, high ground stress. easy collapse and big deformation, the construction of tunnels with mudstone were very difficult.
泥岩隧道围岩软弱，地应力强烈，易坍塌大变形，修建困难。
With the development of deep mining in mines, more and more collapse problems of surrounding rocks named soft rock in roadway become increasing serious.
随着煤矿开采深度的加大，越来越多巷道围岩呈现软岩变形特性，变形破坏非常严重。
For the same collapse type, the larger the buried depth is, the larger the changing amplitude of the stress of surrounding rock is.
对同一类型的塌方，隧道埋深越大，塌方后隧道周边应力变化幅度越大。
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