冻土断裂力学在桩基冻拔稳定计算中的应用

Application of the Fracture Mechanics of Frozen Soil to the Calcuation of Stability of Pile Foundation Uplift

对桩基冻拔的冻土工程问题进行了断裂力学分析，并给出简化模型．在此基础上讨论了断裂判据以及应力强度因子的计算表达式．最后通过实际算例详尽的说明断裂力学方法在桩基冻拔稳定性计算中的应用，并与现行方法做了对比．比较结果表明，断裂力学方法不仅是有效的，而且比现行方法更为完善．

A frozen soil engineering problem of pile foundation uplift, is analyzed using fracture mechanics method, and a simplified model for calculation the stability of pile foundation uplift is presented. Base on it, fracture creteria are discussed, and the expression of stress intensity factor is suggested. At last, application of the fracture mechanics method to actual frozen soil engineering is illustrated in detail. The fracture mechanics method of frozen soil is compared with conventional method in the illustration.