【摘要】 本文主要阐述在一定的加荷速率下，围压和温度对冻结兰州砂上应力－应变特性的影响。试验表明，围压的增大或温度的升高明显增强了冻结砂土的塑性及应变硬化性能。随着围压的增大，冻结砂土的极限偏应力强度和轴向破坏应变增大，随着温度的降低，极限偏应力强度增加，而轴向破坏应变减小，但是当围压为零时，轴向破坏应变不随温度变化。当平均法向应力σ≤６ＭＰａ时，冻结砂土抗剪强度近似服从库仑定律，此时粘聚力和内摩擦角随温度的降低而线性增大；当σ＞６ＭＰａ时，抗剪强度可用抛物型屈服准则来描述。更多还原

【Abstract】 This paper has mainly analysed and discussed affection of confining pressure and tem-perature to stress-strain characteristic of frozen Lanzhou sandy soil under certain loading rate. The results of test have shown that increase of confining pressure obviously strengthens plasticity and strain hardening property of frozen sandy soil．With increase of confining pres-sure，the ultimate deviator stress strength and axial failure strain gradually increase；With de-crease of temperature，the ultimate deviator stress strength and axial failure strain gradually decrease. But when σ₃＝0，the axial failure strain do not change with change of temperature.When the average normal stress σ₃＜6 MPa，the shear stress strength can approximately be expressed by Mohr′s law， and the cohesion and internal friction angle linearly increase with decrease of temperature；When σ₃＞6MPa， the shear stress strength can be expressed by parabolic yield criteria.更多还原