近海竖井冻结天窗成因与治理措施

Causes and management of frozen skylight in offshore shaft

瑞海矿业公司主竖井距海边仅35 m,属于富水软弱地层,表土段采用冻结法施工。受潮汐及周边海水养殖场抽取地下水影响,导致冻结壁容易形成“天窗”。采用冻结器纵向测温技术预测冻结壁开窗部位,采取补打加强冻结孔的措施,加快了冻结壁交圈,效果较好,值得推广。

The main shaft of Ruihai mining company is only 35 m offshore.The strata are water-rich and weak.The topsoil section is constructed by freezing method.Due to the influence of tide and groundwater extraction from the surrounding sea water farms,"skylight"is easily formed on the frozen wall.The window opening position of the frozen wall is predicted by adopting the longitudinal temperature measurement technology of the freezer,and the measures of supplementing strengthened freezing holes are adopted,speeding up the crossing circle of the frozen wall.The effect is good and the process is worth promotion.