A strong freeze-thaw (F-T) weathering effect influences the strength of rock in the high-altitude areas of the Qinghai-Tibet Plateau. To study the long-term deterioration characteristics of rock in an alpine F-T environment, shear creep experiments were conducted on red sandstone from the Sichuan-Tibet highway to analyze its shear creep characteristics under different temperature ranges. The results show that the rock’s stress level gradually decreases with increasing temperature under the same number of F-T cycles, while the creep displacement gradually increases. The long-term strength and long-term reduction factor present apparent decreasing trends with an increase in the F-T temperature range. The failure morphology evolves from shear failure with a single horizontal plane to that with multiple dipping shear planes. The greater the temperature range is, the greater the number of shear secondary cracks that intersect, resulting in more complicated failure morphologies. Then, a Burgers model considering F-T and time-dependent damage was established. The parameters of this model were identified via the experimental creep data of the red sandstone. The accuracy and applicability of the model were verified by comparing the experimental and model-predicted results. These results are significant for the construction of major engineering projects in the alpine region.

强烈的冻融（FT）风化作用影响青藏高原高海拔地区岩石的强度。为了研究高山FT环境下岩石的长期劣化特征，对川藏公路的红砂岩进行了剪切蠕变试验，以分析其在不同温度范围内的剪切蠕变特征。结果表明，在相同数量的FT循环下，岩石的应力水平随着温度的升高而逐渐减小，而蠕变位移逐渐增大。随着FT温度范围的增加，长期强度和长期降低因子呈现出明显的下降趋势。破坏形态从单一水平面的剪切破坏演变为具有多个浸入剪切平面的剪切破坏。温度范围越大，相交的剪切次级裂纹的数量就越大，从而导致更复杂的破坏形态。然后，建立了考虑FT和时间依赖性损伤的Burgers模型。通过红砂岩的实验蠕变数据确定了该模型的参数。通过比较实验结果和模型预测结果，验证了模型的准确性和适用性。这些结果对高寒地区重大工程项目的建设具有重要意义。通过红砂岩的实验蠕变数据确定了该模型的参数。通过比较实验结果和模型预测结果，验证了模型的准确性和适用性。这些结果对高寒地区重大工程项目的建设具有重要意义。通过红砂岩的实验蠕变数据确定了该模型的参数。通过比较实验结果和模型预测结果，验证了模型的准确性和适用性。这些结果对高寒地区重大工程项目的建设具有重要意义。