摘要
为研究倾倒变形边坡在演化过程中的时效变形,通过不同围压条件下三轴压缩板岩蠕变实验,采用统一流变力学模型理论,将Newton体非定常化与引入黏塑性元件,建立触发式的非线性蠕变模型,给出参数建议曲线范围。结果表明:板岩在加载瞬间表现出瞬时的弹性变形,随时间推移进入衰减和稳定蠕变阶段,最后一级加载下发生了加速蠕变行为;等时偏应力-应变曲线由0 h线性段和非线性曲线簇组成,非线性曲线簇呈逐渐偏于应变轴的趋势;板岩在三种围压下的板岩长期强度分别为58.8、72.3和78.6 MPa,长期强度随着围压的增大而递增。所建模型对板岩蠕变曲线识别效果较好,能较为准确地描述不同围压下板岩的蠕变力学行为。
This paper is focused on a study of the time-dependent deformation of toppling deformation slope in the evolution process.The study involves conducting a triaxial compression slate creep experiment under different confining pressure conditions,building a trigger nonlinear creep model with unsteady Newton body and introduced viscoplastic elements using unified rheological mechanics theory,and determining the recommended curve range of parameters.The results show that the slate shows instantaneous elastic deformation at the moment of loading,and entering the stage of attenuation and stable creep with time,and the accelerated creep behavior occurs under the last stage of loading;The isochronous deviatoric stress-strain curve is composed of 0 h linear segment and nonlinear curve cluster,and the nonlinear curve cluster gradually deviates to the strain axis;The long-term strength of slate under three confining pressures is 58.8,72.3 and 78.6 MPa respectively,which increases with the increase of confining pressure.The model is effective in identifying the creep curve of slate,and could accurately describe the creep mechanical behavior of slate under different confining pressures.
作者
姚彦欣
欧荣轩
谭维佳
Yao Yanxin;Ou Rongxuan;Tan Weijia(School of Mechatronics & Automotive Engineering, Qingyuan Polytechnic, Qingyuan 511510, China;Qingyuan Hyopower Planning & Design Institute Co. Ltd., Qingyuan 511510, China;School of Geological Engineering & Mapping, Chang′an University, Xi′an 710054, China)
出处
《黑龙江科技大学学报》
2022年第3期280-285,共6页
Journal of Heilongjiang University of Science And Technology
基金
国家自然科学基金项目(41790443)。
关键词
倾倒变形边坡
板岩
蠕变
触发式
非线性
toppling deformed slope
slate
creep
trigger type
nonlinearity
