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中文摘要：
采用K0固结、负荷冻结、三轴压缩的试验方法,首次进行了4种不同温度梯度冻结中砂在加轴压（CTC）及减围压（RTC）两种路径下的三轴试验,获得了温度梯度和应力路径对冻结中砂应力–应变特性的影响。不同温度梯度及减围压试验的偏应力比–轴向应变关系曲线形态与传统均匀温度下冻结中砂加轴压试验结果类似,可用温度梯度的线性函数对双曲线模型进行修正后予以描述。但是不同温度梯度和两种应力路径条件下的应力应变特性存在很大差异,温度梯度状态和减围压应力路径对冻结中砂的应力–应变特性具有明显的＂弱化效应＂;温度梯度诱导了冻结中砂的非均质性,减小了模型的起始斜率,大大减低了抗变形能力;与加轴压应力路径相比,减围压应力路径试验的偏应力比大为降低,减围压应力路径（开挖过程）弱化了冻结中砂的强度。
英文摘要：
The conventional triaxial compression（CTC） and reduced triaxial compression（RTC）tests are performed on the frozen medium sand subject to K0 consolidation and loaded freezing at different temperature gradients.The effects of temperature gradients and the stress paths on the stress-stain properties are investigated.The results indicate that the relationship types between the axial deformation and the deviator stress for the frozen medium sand during the RTC process and at different temperature gradients present the similar laws as the traditional test results,moreover,the relationships between which can be described by the modified hyperbolic model by using the linear function of the temperature gradients.However,there are evident differences in the stress-strain properties at different temperature gradients and stress paths for the weakening effects.In other words,the temperature gradients result in the non-homogeneous properties and lead to the decrease of the initial slopes together with the ability of resisting the deformation.In addition,the deviator stress ratios in the process of RTC decrease greatly compared with CTC process for the weakening effects of RTC process.
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