【摘要】 通过大量的冻结粘土单轴蠕变试验,获得了单轴应力状态下的蠕变曲线及其参数。根据材料在弹性条件下单轴和三轴条件下的应力强度和应变强度关系,建立了三向应力状态下冻土的蠕变本构方程;分析了粘弹塑性冻结壁应力状态及塑性区的扩展规律,推导了不同区域冻结壁应力场和位移场的计算公式,探讨了防止冻结管断裂的措施。更多还原

【Abstract】 Through a lot of creep test of frozen clay under single-axial stress, the curves and parameters of creep under single-axial stress state are obtained.The creep constitutive equation of frozen soil under trifarious stress state is established through the stress and strain intensity relation of single-axial and triaxial of material under elastic condition.The viscoelasto-plastic stress of frozen wall and the extended law in the plastic zone are analyzed,and the formula on the stress and displacement field of frozen wall in different zone are deduced,the measure to prevent fracture of the frozen pipes is discussed.更多还原