考虑蠕变特性的多冷媒非均质人工冻结壁黏弹性分析  

Viscoelastic analysis of multi-refrigerant heterogeneous artificial frozen wall considering creep characteristics

作　　者：梁秀玲 王彬[1,2] 张子浩[1] 杨炳瑶 吴嘉骏 LIANG Xiuling;WANG Bin;ZHANG Zihao;YANG Bingyao;WU Jiajun(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China;State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学深部煤炭安全开采与环境保护全国重点实验室,安徽淮南232001

出　　处：《冰川冻土》2025年第1期163-178,共16页Journal of Glaciology and Geocryology

基　　金：安徽省自然科学基金面上项目(2408085ME147)资助。

摘　　要：为构建适用于富水地层多圈管冻结的非均质人工冻结壁力学模型以及合理分析该类冻结壁的安全性与稳定性,需研究考虑多冷媒非均质人工冻结壁在黏弹性状态下的受力和变形特性。选取距离冻结温度场主面1/4管距处的特征截面,将“盐水-二氧化碳”联合冻结的非均质冻结壁温度场等效为“三段一次函数”分布。考虑冻结壁内部土体在挖掘过程中的卸载效应,以及冻结壁与周边未冻结土体之间的相互影响,基于黏弹性理论、Mises型增量法则以及Newton Cotes数值积分技术,推导出非均质冻结壁的应力、应变和位移计算公式,并将该公式的计算结果与均质冻结壁的计算结果进行对比分析。分析结果表明:在本算例中,冻结壁卸载初期到井壁完成施工的36 h内,非均质与均质冻结壁的径向位移和应变由内到外均呈现非线性衰减趋势,最大位移、应变发生在冻结壁的内侧;随着时间的推移,冻结壁的井帮位移和外壁位移随着蠕变时间的增加而增加,但增长速率逐渐减小,进入稳态蠕变阶段;考虑蠕变特性及其卸载效应,作用在冻结壁上的外荷载小于土体的初始水平应力,而且,外荷载随着空帮时间的增大而减小,最终趋于稳定;对应相同的时刻和埋深,非均质冻结壁所承受的外荷载大于均质冻结壁,而非均质冻结壁的应变和位移小于均质冻结壁。该研究成果可为富水地层多冷媒联合冻结帷幕的设计提供重要的理论依据和参考。In order to construct the mechanical model of heterogeneous artificial frozen wall suitable for multicircle freezing in water-rich strata and reasonably analyze the safety and stability of this kind of frozen wall,it is necessary to study the stress and deformation characteristics of multi-refrigerant heterogeneous artificial frozen wall in viscoelastic state.The characteristic cross section at 1/4 tube distance from the main surface of freezing temperature field is selected,and the temperature field of the heterogeneous freezen wall of“brine-carbon dioxide”combined freezing is equivalent to the distribution of“three-stage first function”.Considering the unloading effect of the soil inside the frozen wall during the excavation process and the interaction between the frozen wall and the surrounding unfrozen soil,based on the viscoelastic theory,the Mises incremental rule and the Newton Cotes numerical integration technique,the calculation formula of stress,strain and displacement of the heterogeneous frozen wall is derived,and the calculation results of the formula are compared with the calculation results of the homogeneous frozen wall.The analysis results show that in this example,in the 36 hours from the initial unloading of the frozen wall to the completion of the construction of the shaft lining,the radial displacement and strain of the heterogeneous and homogeneous frozen wall show a nonlinear attenuation trend from the inside to the outside,and the maximum displacement and strain occur inside the frozen wall.With the passage of time,the shaft displacement and outer wall displacement of the frozen wall increase with the increase of creep time,but the growth rate gradually decreases and enters the steady-state creep stage.After considering the creep characteristics and unloading effect,the external load acting on the frozen wall is less than the initial horizontal stress of the soil,and decreases with the increase of empty wall time,and finally tends to be stable.Corresponding to the same time and dep

关 键 词：人工地层冻结 非均质冻结壁 多冷媒联合冻结 开挖卸载 黏弹性 蠕变 

分 类 号：P642.14[天文地球—工程地质学]