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冻结壁设计理论是冻结法凿井技术的核心之一。传统的冻结壁厚度塑性设计公式是在加载条件下导出的,未考虑冻结壁与围岩的相互作用和内摩擦角的影响,与实际相差较大。为了更合理地设计冻结壁,建立了考虑开挖卸载作用的冻结壁与井壁相互作用塑性力学模型,推导了应力与位移解析解,分析了各因素对冻结壁厚度的影响规律,建立了新的塑性冻结壁厚度计算公式。分析表明,新公式较传统的公式更合理,并建议选用Coulomb-Mohr屈服准则进行冻结壁厚度计算。
Frozen wall design theory is one of the core of freezing method. The traditional plastic design of the frozen wall thickness is derived under the loading condition without considering the interaction between the frozen wall and the surrounding rock and the internal friction angle, which is quite different from the actual one. In order to design the frozen wall more reasonably, a plastic and plastic model of the interaction between the frozen wall and the well wall considering the effect of excavation and unloading is established. Analytical solutions of stress and displacement are deduced. The influence of various factors on the thickness of the frozen wall is analyzed. The plastic freezing wall thickness calculation formula. The analysis shows that the new formula is more reasonable than the traditional formula, and it is suggested to use the Coulomb-Mohr yield criterion to calculate the frozen wall thickness.