摘要
高放废物处置库、垃圾填埋场等工程中常常涉及到温度场(T)、渗流场(H)和应力场(M)的耦合作用的问题。从试验和理论模型两个角度综述国内外黏土岩温度-渗流-应力耦合特性的研究进展,主要包括其传热特性、温度影响下的渗流特性、变形、强度、蠕变特性。在此基础上,重点分析了黏土岩水-热迁移模型以及热-力耦合本构模型的适应性。基于上述认识,通过试验研究了比利时Boom clay在温度作用下的强度、渗透性、蠕变性等特征。结果表明:随着温度升高,Boom clay的强度有所降低,渗透性显著增强,蠕变速率明显加快。提出了适用于Boom clay的THM耦合弹塑性损伤模型,计算结果验证了模型能合理反映温度的影响。最后,探讨了黏土岩THM耦合机理研究的不足和今后的研究方向。
Nuclear waste disposal and landfill engineering usually involve thermo-hydro-mechanical （THM） coupled issues. This paper reviews the current advancements of the thermo-hydro-mechanical coupled behaviors of clays from both experimental and theoretical aspects, which include the heat transferring behavior, the effects of temperature on seepage, Young＇s Modulus, strength, creep behavior, clay structural characteristic, and so on. Within this context, the applicability of the current moisture and heat transfer models and the coupled thermo-mechanical constitutive models is analyzed. Based on the review, an experimental study on the effect of temperature on strength, permeability, and creep behavior of Boom clay was conducted. The results show that as temperature increases, the strength of Boom clay decreases while its creep rate and hydraulic conductivity significantly increase. Then a coupled thermo-elasto-plastic-damage constitutive model for clay is developed. Finally, the weakness in the study of THM coupling problems is discussed, and the direction for the future research is identified.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2015年第5期1217-1238,共22页
Rock and Soil Mechanics
基金
国家杰出青年基金项目(No.51225902)
国家自然科学基金资助项目(No.51479190)
国家自然科学基金青年科学基金资助项目(No.51309217)
关键词
黏土岩
温度-渗流-应力耦合
水热迁移
力学性质
本构模型
clay
thermo-hydro-mechanical coupling
moisatre-heat transfer
mechanical behavior
constitutive model
