冻土墙用于基坑支护的力学设计方法探讨

Discussion of Design Method of Frozen Wall as Supporting of Foundation Pits

以直线形冻土墙用于基坑支护的物理模拟试验结果为基础 ,分析了冻土墙受力、强度分布特点以及变形特性 .从临时支护和止水两个基本作用出发 ,探讨了冻土墙的力学设计原理和方法 .认为冻土墙有效厚度的计算是力学设计的核心 ,必须综合考虑其温度分布特点、墙体的抗倾覆稳定、强度条件和变形条件 ,并给出了相应的设计步骤 .

Based on the simulation results of a linear frozen wall for supporting foundation pits, the force acting on a frozen wall and the characteristics of its strength and deformation were analyzed. From its two basic functions, namely temporary supporting and underground water sealing, the design principle and method of frozen walls were discussed. It is pointed out that the key to the design of a frozen wall is the determination of its effective thickness and that the distribution of temperature, the stability against the overturn and the conditions of its deformation and strength should be synthetically considered when its effective thickness is determined. Finally, the relevant design process was given.