Chen ZhengDong, Lin Bin, Hou HaiJie
College of Civil Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China.
Sci Rep. 2025 Apr 1;15(1):11193. doi: 10.1038/s41598-025-91817-z.
Taking the Gubei Mine as the research object, indoor uniaxial creep tests were carried out at temperatures of -5, -10, and -15℃ under loads of 0.3, 0.5, and 0.7σs to study the creep characteristics of deep soil, Based on the Burgers rheological model and the auxiliary formula of viscoelastic rheological formula, the freezing pressure under the combined action mechanism of frozen wall, outer shaft wall and polystyrene foam board was theoretically analyzed. The results show that the creep deformation of frozen clay under a certain constant stress loading changes with time. At three temperatures, the creep is attenuated creep under constant stress of 0.3 and 0.5σs; it exhibits non-attenuated creep at a constant stress level of 0.7σs, and the growth rate increases over a certain period of time, and finally it is destroyed by excessive deformation over time. The calculated value of the freezing pressure calculated by the frozen wall model is roughly the same as the development law of the measured value, and the calculated value of the theoretical value of the freezing pressure is slightly larger than the measured value, indicating that the calculated value can be an effective reference for the creep of the frozen wall and can provide a guarantee for the construction safety.
以古北矿为研究对象，在-5、-10和-15℃温度下，于0.3、0.5和0.7σs荷载作用下进行室内单轴蠕变试验，以研究深部土体的蠕变特性。基于伯格斯流变模型和粘弹性流变公式的辅助公式，对冻结壁、外层井壁和聚苯乙烯泡沫板共同作用机制下的冻结压力进行了理论分析。结果表明，在一定恒定应力加载下，冻土的蠕变变形随时间而变化。在三个温度下，在0.3和0.5σs恒定应力下蠕变是衰减蠕变；在0.7σs恒定应力水平下呈现非衰减蠕变，且在一定时间段内增长率增加，最终因变形过大随时间而破坏。冻结壁模型计算的冻结压力计算值与实测值的发展规律大致相同，冻结压力理论值计算值略大于实测值，表明计算值可为冻结壁的蠕变提供有效参考，可为施工安全提供保障。
