盐岩非线性Burgers模型及其参数识别
发布时间：2019-02-26 19:58
【摘要】：基于非线性流变力学理论,对常规黏滞体元件进行改进,提出一种新的变系数非线性黏滞体,其黏滞系数随时间增加而逐渐增大。将该非线性黏滞体替换常规Burgers模型中的线性黏滞体,建立非线性Burgers模型即NBurgers模型。该模型在一定的条件下可退化为常规Burgers模型。对盐岩试件开展三轴压缩蠕变试验,并利用试验结果,根据非线性最小二乘法基本原理对NBurgers模型的参数进行反演识别。拟合曲线和试验曲线对比显示:Nburgers拟合效果良好,误差较小,拟合曲线非常逼近于试验曲线,且其与试验曲线的吻合程度要明显高于常规Burgers模型,说明该模型能够更好地描述盐岩的黏弹性蠕变特性。
[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.
【作者单位】： 西安建筑科技大学土木工程学院;重庆大学土木工程学院;福州大学土木工程学院;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2009CB724606) 国家自然科学基金资助项目(41202195)
【分类号】：TU452
本文编号：2431101
[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.
【作者单位】： 西安建筑科技大学土木工程学院;重庆大学土木工程学院;福州大学土木工程学院;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2009CB724606) 国家自然科学基金资助项目(41202195)
【分类号】：TU452
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相关硕士学位论文 前2条
1 余鹏程;吹填土蠕变特性试验研究[D];大连理工大学;2012年
2 马珂;合肥非饱和膨胀土蠕变试验与模型研究[D];安徽建筑工业学院;2012年
，本文编号：2431101
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