黏土地层联络通道冻结壁厚度优化设计及应用研究*

为解决传统冻结壁设计方法不能真实、合理地反映黏土地层中联络通道冻结壁实际受力情况，进而导致冻结壁厚度设计过于保守的问题，结合黏土地层直墙拱形冻结壁实际受力特点，基于对冻结壁支护压力的合理计算，提出1种适用于黏土地层冻结壁厚度设计的优化方法。结果表明:与传统设计方法相比，该方法所确定冻结壁支护压力与实际施工环境中冻结壁受力状态吻合效果更好，并且能够提供合理的安全储备；经数值计算和现场应用验证，计算所得冻结壁设计方案可以满足施工环境中的承载力及变形稳定性要求；且相较传统设计方案，所得方案兼具安全性与经济性，可有效规避因设计过于保守和冻结周期过长引起的冻胀、融沉变形过大等工程灾害的风险；该方法高效、易行，可为传统冻结壁设计方法提供必要补充，亦可为类似工程的施工设计提供有益参考。

Research on optimized design and application of frozen wall thickness for cross-passage in clay stratum

In order to solve the problem that the existing traditional frozen wall design methods cannot truly and reasonably reflect the actual force on the frozen wall of cross passage in the clay stratum,which leads to the too conservative design of frozen wall thickness,combined with the actual force characteristics of the straight wall arched frozen wall in the clay stratum,an optimization method being suitable for the design of frozen wall thickness in the clay stratum was proposed based on the reasonable calculation of the support pressure of frozen wall.The results showed that compared with the traditional design method,the support pressure of frozen wall determined by this method had better agreement effect with the force state of frozen wall in the actual construction environment,and it could provide reasonable safety reserve as well.Through the numerical calculation and field application verification,the design scheme of frozen wall calculated by this method could meet the requirements of bearing capacity and deformation stability in the construction environment.Furthermore,compared with the traditional design scheme,the obtained scheme was not only safe but also economical,and it could effectively avoid the risks of engineering disasters caused by the over conservative design and the too long freezing period,such as the excessive deformation induced by frost heave and thaw settlement,etc.The method is efficient and easy to implement.Thus,it can provide necessary supplements to the existing traditional design method of frozen wall,and also provide useful reference for the construction design of similar projects in the future.