麦垛山矿井副立井井筒上段井壁保护技术措施

麦垛山矿井副立井井筒按照普通凿井法施工至-251m时,因井筒涌水量大,无法继续施工。经论证决定井筒下段(-251m以下)采用冻结法施工,并采取适当加大冻结圈径、采用差异冻结方式、施工泄压孔等措施,对已施工井筒进行保护,取得了较好的效果,已施工井筒没有受到冻结工程的影响和破坏。

Upper Wall Technical Protection Measures for Auxiliary Vertical Shaft of Mai Duoshan Coal Mine

Maiduoshan Mine’s Vice Mine Shaft construction in accordance with the ordinary sinking to-251m,due to borehole water inflow volume,can not continue with the work.It has been demonstrated,the decision wellbore under paragraph(-251m) using the freezing method construction,and to take appropriate increase the freeze circle diameter,using the difference measures to freeze the way,construction and pressure relief hole,protection of Construction wellbore,Achieved good results,has been the construction of the wellbore is not subject to freeze the project impact and damage.