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在郭屯矿、郓城矿冻结法凿井过程中,开展了冻结壁内、外部水平地压的现场实测研究.结果表明:地层冻结过程中,冻结壁内、外部产生了极其显著的水平冻胀力;最大冻胀力达到初始水平地压的0.8~1.23倍,普遍介于0.9~1.1倍之间;导致冻结壁外载最大达到甚至超过初始水平地压的2倍.井筒掘进过程中,冻胀力发生了不同程度的释放,冻结壁外部残余冻胀力约为最大冻胀力的0.45~0.60倍,使冻结壁外载约为初始水平地压的1.5倍.冻胀力的积聚与释放,加剧了井筒掘砌过程中冻结管与冻结壁的受力与变形,并使冻结压力接近甚至超过初始水平地压,是威胁冻结凿井安全的关键因素.
In the process of Kuantun mine and 郓cheng mine freezing method, an on-site investigation of the horizontal and vertical pressure of freezing wall was carried out.The results show that extremely significant horizontal freezing occurs in and outside the freezing wall And the maximum frost heaving force reaches 0.8-1.23 times the initial horizontal pressure, which is generally between 0.9-1.1 times; the external load of the frozen wall reaches or even exceeds twice that of the initial horizontal pressure. During wellbore excavation, The frost heaving force is released to some extent, and the residual frost heaving force outside the frozen wall is about 0.45 ~ 0.60 times the maximum frost heaving force, which makes the frozen wall load about 1.5 times of the initial horizontal pressure. Release and exacerbate the stress and deformation of the frozen pipe and the frozen wall in the process of wellbore excavation, and make the freezing pressure close to or even exceed the initial horizontal pressure, which is a key factor threatening the safety of frozen shaft drilling.