The new freezing technology and the new freezing design method used in construction of the auxiliary shaft of Longgu Colliery that its freezing deepness is the first exceed 600 m in thick alluvium.

• 就板集矿井实际条件论述了深厚表土井筒施工方法的选择,依据最新的相关规范提出了钻井法施工的钢筋混凝土井壁及钢板混凝土复合井壁的设计计算方法。