本文關鍵詞： 凍結(jié)粘性土 結(jié)構(gòu)性 損傷特性 影響因子 蠕變 損傷本構(gòu)模型 蠕變損傷本構(gòu)模型　出處：《安徽理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：凍土是種十分特殊的材料,而凍土結(jié)構(gòu)性的研究也經(jīng)歷了漫長曲折的探索過程,隨著科技的發(fā)展,人工凍土技術的應用越來越多,對凍土結(jié)構(gòu)性的研究依然重要,不管是理論的建立還是經(jīng)驗的累計,隨著對凍土結(jié)構(gòu)性研究的發(fā)展,工程建設將更加安全和科學。本文通過對重塑土人工凍結(jié)并進行單軸壓縮試驗和單軸蠕變試驗,通過考慮不同的含水率及溫度,分析凍土的物理力學性質(zhì)并研究凍土的結(jié)構(gòu)性。將計算機統(tǒng)計出的實時數(shù)據(jù)進行截面積修正,考慮泊松比對試驗數(shù)據(jù)的影響,為之后的研究工作提供更符合實際的試驗數(shù)據(jù)。根據(jù)單軸壓縮試驗得到損傷起始條件(應力損傷門閥值和應變損傷門閥值)并找出其與溫度、含水率之間的關系;確定損傷變量D,從而得到凍土損傷本構(gòu)模型,對不同試驗條件下的單軸壓縮曲線進行擬合,證明了此模型能夠很好的描述凍結(jié)粘性土的應力-應變曲線特征。根據(jù)單軸蠕變試驗分析凍結(jié)粘性土的蠕變特性,分析不同流變模型的應用,從而建立考慮結(jié)構(gòu)損傷的流變模型,并將理論值與實驗值比較,證明了此模型可以很好的描述凍結(jié)粘性土的蠕變特性。分析蠕變對凍土單軸抗壓強度的影響,并用損傷本構(gòu)模型進行擬合,結(jié)果表明,此損傷本構(gòu)模型可以很好的描述預壓后凍土應力-應變曲線中的彈性階段以及應變較大時的損傷階段,而只在彈性段結(jié)束后,損傷開始階段初期與實驗值有較大差異。
[Abstract]:Frozen soil is a very special material, and the study of frozen soil structure has also experienced a long and tortuous exploration process. With the development of science and technology, the application of artificial frozen soil technology is more and more, and the study of frozen soil structure is still important. With the development of structural research on frozen soil, engineering construction will be safer and more scientific, no matter whether the theory is established or the accumulated experience is accumulated. In this paper, uniaxial compression test and uniaxial creep test are carried out on remolded soil by artificial freezing, and uniaxial compression test and uniaxial creep test. By considering different moisture content and temperature, the physical and mechanical properties of frozen soil are analyzed and the structure of frozen soil is studied. According to the uniaxial compression test, the damage initiation conditions (stress damage threshold value and strain damage threshold value) are obtained and the relationship between the damage threshold and temperature and moisture content is found out. According to the damage variable D, the damage constitutive model of frozen soil is obtained, and the uniaxial compression curve under different experimental conditions is fitted. It is proved that this model can well describe the stress-strain curve of frozen clay. According to uniaxial creep test, the creep characteristics of frozen clay are analyzed, and the application of different rheological models is analyzed. Thus a rheological model considering structural damage is established and compared with experimental data. It is proved that the model can describe the creep characteristics of frozen clay and analyze the influence of creep on uniaxial compressive strength of frozen soil. The damage constitutive model is used to fit the damage constitutive model. The results show that the damage constitutive model can well describe the elastic stage in the stress-strain curve of frozen soil after preloading and the damage stage when the strain is large, but only after the end of the elastic section. There was significant difference between the initial stage of injury and the experimental value.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU445

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