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在深厚表土中进行冻结法施工常产生由于冻胀应力造成的冻结管断裂,为减小深井冻结壁在形成过程中产生的内部冻胀应力,采取外圈辅助冻结孔滞后于主圈孔冻结的施工方案,能有效地防止冻结管断裂.应用有限元方法对淮南某煤矿主井冻结井筒分期冻结过程进行了瞬态温度场数值模拟,和现场实测十分接近.分期冻结方案能减少冻结壁内部水分聚集,以达到减少冻胀应力的目的,并形成相对比较均匀的温度场.相同冻结条件下采用分期冻结方案,冻结壁有效厚度增大约15%.数值模拟的系统分析可为深井冻结壁的设计与施工提供科学依据.
Frozen method construction in deep topsoil usually results in freezing tube fracture caused by frost heave stress. To reduce the internal frost heaving stress caused by the formation of frozen wall in deep well, the outer ring assisted freezing hole lags behind the main ring hole to freeze Construction scheme can effectively prevent the freezing tube fracture.The finite element method is used to simulate the transient temperature field in the staged freezing process of the main shaft of a coal mine in Huainan coal mine and is close to the field measurement.The staging and freezing scheme can reduce the internal moisture So as to reduce the frost heave stress and to form a relatively uniform temperature field.Using the staged freezing scheme under the same freezing condition, the effective thickness of the frozen wall is increased by about 15% .The systematic analysis of numerical simulation can be used to design the frozen wall of deep well And provide a scientific basis for construction.