Numerical Study Of Mechanical Property On Artificial Frozen Wall

Based on thermodynamical theory, considering the phase changed regulation of frozen soil, this thesis deduces the frozen soil's differential equation correlating with temperature. By the finite-element method and these controlling equations, simulate the temperature state of some area in the highway of Da Ban Mountain, contrasting existing experiment results, those numerical solutions show the calculating method's rationality and creditability in some extent. Because researchers paid more attention to the existed frozen soil in the cold district in the past, and consider less in the positive application aspect in the engineering. The research fruits of frozen mechanical property in engineering application are less. Based on circular foundation ditch for the suspension bridge in the southern region ,the thesis build a corresponding model to simulate frozen statement to be in favor of the engineering usage .Meanwhile, we must consider some mechanical problems brought by engineering application ,Through the Newton-Raphson method and differential equation controlled by temperature ,we build a mathematical model to simulate the formative process for deep foundation pit, analyze the variational regulation of temperature for the congelation wall, conclude the temperature's distributing regulation in some main positions under certain congelation speed.Because of the influence of the environmental temperature during the freezing and excavating ,temperature is a major factor which affect the mechanical property of frozen wall. The thesis consider excavating factor's influence and simulate the state , considering the temperature stress as some kind of equivalent load in order to calculate the couple effect of temperature field and stress field .Through the numerical calculation of couple equation and compared with the results when temperature stress is not considered, gained the variational regularity of two kinds of situation, result shows that excavating depth influence the stress and displacement of the frozen wall greatly.