冻结凿井中冻结壁位移规律及影响因素的研究

Study on Regularity and Influence Factors of Displacement of Frozen Soil Wall in Freeze Sinking

This paper associates itself with the practical intensifing freeze method used in mine shaft of Xie Qiao in Huai Nan. By combining measurement in situ with finite elemant numerical simulation method, systematic analysis has been taken on the frozen soil wall's displacement of deep-seated thick day. With space concerned, the displacement distributions not only on the surface of frozen soil wall, but also in inner frozen soil wall and in the site of freezing pipes have been got. With time concerned, not only the displacement in the case of one segment wall exposed, but also the leading displacement and the displacement in the frozen soil wall after being lined in have been studied. The total displacement and regularity of displacement in frozen soil wall revealing in the process of operation in deep-seated thich day have been obtained. The interfluence of the upper and lower segment walls on displacement has been discovered, and the regularity of displacement has also been revealed. It has been concluded that the maximum displacement appears at the middle or lower parts of deep-lying thick day. The breaking mechanism and position of fracture of freezing pipe have been found out. Using numerical simulation the factors which affect the displacement of frozen soil wall have been analysed, the formula for the displacement of inner surface of frozen soil wall and influence factors has been obtained on the condition of zero excavation velocity. Based on those, a new--method sectionlized constant segment wall's superposition method has been put forward for calculating displacement of frozen soil wall in shaft sinking.