The geological disaster, such as cave of karst, rushing water and collapse often occur in tunnel excavation.
隧道在施工中不可避免地会遇到诸如溶洞、突水、坍塌等常见的地质灾害。
To avoid disasters, while take the construction costs and difficulties into account, determining a reasonable distance between tunnel and karst cave is of great important.
要在避免灾难发生的同时综合考虑施工成本及难度，合理确定隧道与溶洞的安全距离是关键。
The plastic zone of the surrounding rock mainly concentrates around the tunnel and the two sides of karst cave while the top and the bottom of karst cave have little plastic zone.
围岩塑性区主要集中在隧道的周围和溶洞的左右侧部，溶洞的顶部和底部处塑性区较少。
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