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针对在竖井冻结法施工中对冻结壁中粘塑性变形和冻胀力的忽视引起的冻结管断裂和井壁破裂等工程事故,在卸载情况下考虑周围土体、冻结壁和井壁共同作用的同时考虑了冻结壁中冻土冻胀特性和流变特性以及塑性区的存在,建立井壁砌筑前后冻结壁的粘弹塑性稳定性分析模型,求得井壁砌筑前井帮的变形规律和井壁砌筑后作用于井筒外壁的冻结压力的增长规律以及两种情况下冻结壁进入塑性的时间。
Aiming at engineering accidents such as freezing pipe fracture and shaft wall rupture caused by the neglect of viscoplastic deformation and frost heave force in frozen wall during construction of shaft freezing method, considering the joint action of surrounding soil, freezing wall and borehole wall under unloading condition At the same time, the frost heave characteristics and rheological properties of frozen soil and the existence of plastic zone are considered. The viscoelastic-plastic stability analysis model of frozen wall before and after the construction of shaft lining is established and the deformation law And the law of growth of the freezing pressure acting on the outer wall of the wellbore after masonry wall construction and the time for the frozen wall to enter plasticity in both cases.