摘要
通过分析炭质泥岩泥化夹层的直剪流变实验成果,表明炭质泥岩泥化夹层的法向应力和剪应力为线性关系,存在统一的蠕变加速阶段来临时的极限应变量。基于老化理论,建立了适合弱层流变特性的流变力学模型,该模型可以描述初始蠕变、等速蠕变和加速蠕变三个阶段过程。依据蠕变加速阶段来临时的极限应变量得到了长期强度方程,从而为边坡变形分析和滑坡中长期预报提供了可靠的依据。
Linear relation between the normal and shear stress in muddy intercalation and the existence of unified ultimate strain at accelerated creep were proved based on the direct shear rheological tests results of muddy intercalation interbeded in brown mudstone. A rheological model suitable to describe the theological characteristics of weak layer was established based on deterioration theory. This model is capable of describing three creep phases, i.e. transient creep, stable creep and accelerated creep. At last, the long-term strength was obtained based on ultimate strain at the beginning of the accelerated creep, which thereby can provide reliable evidence for slope deformation analysis and long and medium term landslide forecast.
出处
《实验力学》
CSCD
北大核心
2008年第5期396-402,共7页
Journal of Experimental Mechanics
基金
国家重点基础研究发展计划(973计划)项目(2007CB209405)
国家自然科学基金项目(50674025,50504005,10872046,50874024)
教育部重点科技项目(107033)
教育部新世纪优秀人才基金(NCET-05-0290)
关键词
炭质泥岩
泥化夹层
流变实验
长期强度
peat mudstone
siltized intercalation bed
rheological test
long-term strength
