During the excavation of underground chamber in the soft rock, lining thickness are increased to keep the stability of surrounding rock.
在软弱岩体中进行地下洞室开挖时，通常采用加大衬砌厚度来维持围岩的稳定。
Tunnel stability, especially in soft rock tunnel, will be affected to certain degree for the enormous over-break or under-break of excavation.
在超欠挖严重的情况下，对隧道的稳定性，尤其是软岩隧道会产生一定的影响。
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