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冻结壁设计理论是冻结法凿井技术的核心之一。传统的冻结壁厚度弹性设计公式在冻结壁与围岩的弹性模量之比小于10时有较大的误差。为了更合理地设计冻结壁,考虑了开挖卸载作用以及冻结壁与围岩的相互作用,建立了一个更符合实际的力学模型;推导出了其弹性解析解;分析了冻结壁与围岩的应力和位移变化规律;讨论了冻结壁厚度的设计方法;基于Tresca强度条件和Mises强度条件,分别建立了新的冻结壁厚度弹性设计公式。分析比较表明,新公式较传统的冻结壁厚度弹性设计公式更合理,更节省。
Frozen wall design theory is one of the core of freezing method. The traditional design formula of frozen wall thickness elasticity has larger error when the ratio of elastic modulus between frozen wall and surrounding rock is less than 10. In order to design the frozen wall more reasonably, the interaction between the frozen wall and the surrounding rock is taken into consideration, and a more realistic mechanical model is established. The elastic analytical solution is deduced. The frozen wall and the surrounding rock Stress and displacement. The design method of the frozen wall thickness is discussed. Based on the Tresca strength condition and the Mises strength condition, a new design formula of the frozen wall thickness elasticity is established respectively. The analysis and comparison shows that the new formula is more reasonable and more economical than the traditional elastic wall thickness design formula.