In order to prevent the freezing canal from abruption, in the cause of the observation on main bed, shortened the height of the tunneling, made the well construction safe and trouble-free operation.

• 为了有效地防止由于井帮位移量过大造成的冻结管断裂,在井筒掘进过程中对主要层位进行了观察,对变形量大的地层采取了缩短掘进段高的措施,使井筒施工安全、顺利,对类似条件下井筒的冻结施工具有一定的指导意义。