【摘要】：基于非線性流變力學理論,對常規(guī)黏滯體元件進行改進,提出一種新的變系數(shù)非線性黏滯體,其黏滯系數(shù)隨時間增加而逐漸增大。將該非線性黏滯體替換常規(guī)Burgers模型中的線性黏滯體,建立非線性Burgers模型即NBurgers模型。該模型在一定的條件下可退化為常規(guī)Burgers模型。對鹽巖試件開展三軸壓縮蠕變試驗,并利用試驗結果,根據(jù)非線性最小二乘法基本原理對NBurgers模型的參數(shù)進行反演識別。擬合曲線和試驗曲線對比顯示:Nburgers擬合效果良好,誤差較小,擬合曲線非常逼近于試驗曲線,且其與試驗曲線的吻合程度要明顯高于常規(guī)Burgers模型,說明該模型能夠更好地描述鹽巖的黏彈性蠕變特性。
[Abstract]:Based on the theory of nonlinear rheological mechanics, a new nonlinear viscous body with variable coefficient is proposed by improving the conventional viscous elements. The viscosity coefficient increases gradually with the increase of time. The nonlinear viscous body is replaced by the linear viscous body in the conventional Burgers model, and the nonlinear Burgers model, that is, the NBurgers model, is established. The model can be reduced to a conventional Burgers model under certain conditions. The triaxial compression creep test of salt rock specimen is carried out. The parameters of NBurgers model are identified by using the test results and the basic principle of nonlinear least squares method. The comparison between the fitting curve and the test curve shows that the fitting effect of Nburgers is good, the error is small, the fitting curve is very close to the test curve, and the degree of agreement between the fitting curve and the test curve is obviously higher than that of the conventional Burgers model. It shows that the model can better describe the viscoelastic creep characteristics of salt rock.
【作者單位】： 西安建筑科技大學土木工程學院;重慶大學土木工程學院;福州大學土木工程學院;
【基金】：國家重點基礎研究發(fā)展計劃(“973”計劃)項目(2009CB724606) 國家自然科學基金資助項目(41202195)
【分類號】：TU452

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本文編號：2431101