摘要
颗粒滑移是影响堆石体强度和变形的主要因素之一。本文采用钢珠人工模拟堆石料进行常规三轴排水试验,探讨堆石料变形细观机理对其强度和变形特性的影响。研究工作表明,不破碎模拟堆石料的莫尔-库仑强度包线为过原点的直线。在峰值强度以前,不破碎人工模拟堆石料的变形近似满足Rowe剪胀方程。在峰值强度以后,颗粒组咬合结构的崩塌失稳变形可显著地削弱土体的剪胀,此时Rowe剪胀方程会过高估计堆石料的剪胀变形。修正Rowe剪胀方程对颗粒非滑移变形具有更好的适应性。
One of the major factors that affect the strength and deformation of rockfill materials is particle sliding. Based on triaxial tests of artificial rockfill materials of steel balls,the effect of micromechanics on strength and deformation of rockfill materials is investigated in this paper. The results show that the Mohr-Coulomb strength envelope of uncrushed artificial rockfill materials is a line passing through the origin point. Before the peak strength,the deformation of uncrushed artificial rockfill materials satisfies Rowe dilatancy equation. After the peak strength,the dilatancy of soil is reduced by the local unstable deformation resulting from the collapse of particle group interlocking,so the dilatancy deformation of rockfill materials will be overestimated by Rowe dilatancy equation. The modified Rowe dilatancy equation will be more adaptive to the unsliding deformation of particles.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第2期210-215,221,共7页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(50639060,50879040)
高等学校博士学科点专项科研基金(20060003040)
关键词
岩土力学
堆石料模拟
常规三轴试验
钢珠
Rowe剪胀方程
颗粒破碎
geotechnical mechanics
rockfill material simulation
conventional triaxial test
steel balls
Rowe dilatancy equation
particle breakage
