长江科学院院报2017，Vol.34Issue(12)：101-105,5.DOI:10.11988/ckyyb.20160466
冻结褐色泥岩非线性加速蠕变西原模型优化
An Optimized Nishihara Model for Nonlinear Accelerating Creep of Frozen Brown Mudstone
摘要
Abstract
In the present research,uniaxial creep test was conducted under different axial compression levels at varying freezing temperature (-5℃,-10℃,-15℃) by WTD-100 artificial frozen soil apparatus to investigate the accelerating creep of frozen brown mudstone.The brown mudstone in a coal mine shaft in Shaanxi Province was taken as research object.Test results showed that the frozen brown mudstone experienced three stages of transient elasticity,deceleration and stability under low axial pressure,and four stages of instantaneous elasticity,deceleration,constant velocity,and acceleration under high axial compression level.The influence of axial compression on frozen brown mudstone is much greater than that of temperature.Moreover,by connecting nonlinear viscous dampers with strain start,an optimized Nishihara model with seven elements was established based on classical Nishihara model,and the model parameters are analyzed through nonlinear regression by the least square method.Analysis results showed that the fitting curves of the optimized Nishihara model are in good agreement with the experimental results.The optimized Nishihara model is more specifically suitable for describing the variation rule of nonlinear accelerating creep characteristics of frozen brown mudstone.关键词
冻结褐色泥岩/加速蠕变/优化西原模型/单轴等载荷蠕变试验/最小二乘法Key words
frozen brown mudstone/accelerating creep/optimized Nishihara model/uniaxial equivalent-loading creep test/least square method分类
建筑与水利引用本文复制引用
刘晓燕,刘路路,闫坤伐..冻结褐色泥岩非线性加速蠕变西原模型优化[J].长江科学院院报,2017,34(12):101-105,5.基金项目
国家自然科学基金项目(50804002) （50804002）
