古树包滑坡滑带土蠕变模型的研究  

The Research of Creep Model for the Slide Zone Soil of Gushubao Landslide

作　　者：邹良超[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,443002

出　　处：《灾害与防治工程》2011年第1期1-7,共7页Disaster and Control Engineering

摘　　要：针对古树包滑坡滑带土的蠕变试验资料，通过对几种元件组合模型的特性的分析，选取了最能有效反应蠕变曲线特点的M－2K蠕变模型来对试验数据进行函数拟合；介绍了该模型参数初值的求解方法，并利用Matlab软件的非线性回归工具求解出了不同围压及不同剪应力水平下M－2K模型的所有参数。结果表明，M－2K模型与实验数据拟合的相关系数都在0．93以上，拟合效果较好。最后对M－2K蠕变模型参数与剪应力水平、围压之间的相关性进行了分析，得出其参数与围压、偏应力存在幂函数关系的结论，表明滑带土具有明显的非线性蠕变性质，且在高偏应力水平下，滑带土的非线性蠕变特性越明显。Based on the creep test data of the slide zone soils of Gushubao landslide, the M- 2K creep model, which can reflect the characteristics of the creep curves, has been chosen to fit test data. Method of obtaining initial parameters of M-2K creep model is presented in this paper and all the parameters of the model under different confining pressures and deviator stress level are also obtained by using the non-linear regression tools of Matlab software. Predicted results with the M-2K creep model are in reasonable agreement with the experimental results, with all correlation coefficients of the fitting curves above 0.93. In the end, the relationships between parameters of M-2K creep model and the deviator stress as well as confining pressure are analyzed and a conclusion has been drawn that there exists a power function between the parameters and the deviator stress as well as the confining pressure, which reflects the non-linear creep characteristics of slide zone soil, especially, the higher deviator stress is, the more obvious non-linear creep characteristics are.

关 键 词：滑带土 蠕变模型 非线性回归 应力水平 非线性蠕变 

分 类 号：TU528.01[建筑科学—建筑技术科学]