【摘要】 利用冻粘土试件进行了三轴蠕变试验,从而获得了复杂应力状态下的蠕变曲线。根据试验结果,建立了非线性蠕变方程来描述不同温度下冻粘土的蠕变特性。通过回归分析,得到了冻粘土蠕变参数的数值。根据冻土的流变理论,探讨了塑粘区的扩展规律,最后推导出了冻结壁厚度计算公式。同时,又进一步探讨了防止冻结管断裂的有效途径。更多还原

【Abstract】 The specimens of frozen clay are used for carrying out the long-term creep tests under triaxial stress states so that the creep curves of the frozen clay are derived. According to the testing results, the nonlinear creep equation is proposed to describe the nonlinear creep property of frozen clay at different temperatures. By means of regression analysis, the values of creep parameters of frozen clay are obtained. The developing regularity of the viscoplastic region is approached with the aid of rhelogical theory of frozen soil and a formula is derived to calculate the thickness of frozen wall. At the same time the available methods are set forth to prevent fracture of the frozen pipes.更多还原