發(fā)布時間：2018-01-09 22:23

  本文關鍵詞：深部人工凍土力學特性及分數(shù)階導數(shù)西原模型研究　出處：《安徽理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 凍土 本構模型 粒子群 分數(shù)階導數(shù) 蠕變

【摘要】：近年來,隨著寒區(qū)工業(yè)和農業(yè)的快速發(fā)展以及凍結法施工技術在煤礦凍結法鑿井、越海隧道、越江隧道、地鐵等工程上的推廣和應用。在工程中出現(xiàn)了各種工程問題如：煤礦透水、隧道的坍塌、海底隧道透水等,這些問題造成了生產停工,列車中斷行車,巨大的經濟損失等問題,給社會帶來了巨大的影響；人們也日益認識到了解決凍土問題的緊迫性,因此,凍土的研究已成為重要的研究課題；本文正是基于此對凍土的彈塑性本構模型及粒子群分數(shù)階導數(shù)的西原模型進行了研究。本文研究成果無論是在理論上還是在解決實際工程問題均具有重要的指導意義。 利用安徽理工大學凍土研究所自行研制的W3Z—200型電液伺服三軸試驗機凍結砂質黏土進行力學試驗,對原狀土和重塑土進行了不同溫度(-5℃、-10℃、-15℃)和不同圍壓(1MPa、2MPa、3MPa)條件下的三軸剪切試驗,獲得了應力—應變曲線及三軸剪切強度,通過比較可以發(fā)現(xiàn)重塑土的強度低于原狀土的強度。原狀土呈應變軟化型,重塑土屬于強應變硬化型�；趦鐾恋钠茐臏蕜t、屈服準則、相關聯(lián)的流動法則,同時建立了修正劍橋模型的凍土的屈服函數(shù),確立了凍土的彈塑性本構模型,為了驗證本構模型的合理性,對本構模型進行了采用隱式函數(shù)積分格式的程序求解,驗證了本構模型的合理性。 利用安徽理工大學凍土研究所自行研制的WDT—100型型微機控制電液伺服凍土單軸試驗機進行了凍結砂質黏土的蠕變力學試驗,分別進行了三個溫度(-5℃、-10℃、-15℃)和三個加載系數(shù)(0.3σs、0.5σs、0.7σs(σs--單軸強度)下的單軸蠕變試驗,獲得了應力-應變曲線。基于傳統(tǒng)的西原模型不能描述凍土加速流變階段的變形,運用分數(shù)階導數(shù)的性質,建立了分數(shù)階導數(shù)的西原模型,同時對經典的西原模型和分數(shù)階導數(shù)進行了數(shù)值擬合,在對分數(shù)階導數(shù)的西原模型擬合時,用粒子群的方法進行了優(yōu)化,驗證了粒子群分數(shù)階導數(shù)的西原模型在擬合凍土加速流變過程中的優(yōu)越性。
[Abstract]:In recent years, with the rapid development of industry and agriculture in cold region and freezing construction technology in coal mine freezing method sinking, cross-sea tunnel, cross-river tunnel. The extension and application of subway and other projects. In the project, there are various engineering problems such as coal mine water permeability, tunnel collapse, submarine tunnel water permeability, these problems have caused production stoppage and train traffic interruption. The huge economic loss and other problems have brought great influence to the society; People are also increasingly aware of the urgency of solving the problem of frozen soil, therefore, the study of frozen soil has become an important research topic; In this paper, the elastoplastic constitutive model of frozen soil and the westerline model of fractional derivative of particle swarm are studied. The research results in this paper have important guidance both in theory and in solving practical engineering problems. Meaning. The mechanical tests of frozen sandy clay with W3Z-200 electro-hydraulic servo triaxial testing machine developed by the Institute of Frozen soil of Anhui University of Technology were carried out. The undisturbed soil and remolded soil were tested at different temperatures (-5 鈩，

本文編號：1402777