摘要
高水平应力作用下,砂土等颗粒材料中的颗粒将发生破碎。一方面,颗粒破碎导致材料的颗粒分布曲线发生变化:材料中的粗颗粒含量减少,细颗粒含量增加;另一方面,颗粒的破碎引起了能量的转化。由能量守恒定律,作用过程中外力所做的功一部分由粒间摩擦力转化成热能,而另一部分则消耗到颗粒破碎过程中。利用表面物理学理论,颗粒破碎能可以表达为颗粒表面张力在颗粒破碎中所作的功。由此得到了一维压缩条件下颗粒破碎量与宏观压缩量之间的关系表达式。为了验证得到的关系式,开展了砂土的一维压缩试验,并进行了试验数据的整理分析。研究结果表明,所得关系表达式能较好地反映高水平应力作用下颗粒破碎对颗粒材料压缩性的影响。
Grain crushing occurs in granular materials when the materials are compressed at high stresses.On one hand,grain crushing induces the evolution of grain size distribution.The content of coarse grains decreases while the content of fine grains increases.On the other hand,the crushing of grains induces the conversion of energies.According to the law of the conservation of energy,one component of the work done by external forces is transferred into heat energy due to the friction between grains;and the other component is dissipated into grain crushing,which was estimated using the theory of surface physics in this study.A relationship between grain crushing amount ratio and void ratio was obtained based on the theories of fractal geometry.One-dimensional compression tests on sand were conducted and relevant test data were examined to verify the obtained relationship.It was indicated in this study that the obtained relationship can describe the influence of grain crushing on the compressibility of granular materials at high stresses.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第10期3051-3057,共7页
Rock and Soil Mechanics
基金
高等学校博士学科点专项科研基金资助课题(No20060422002)
关键词
砂土
一维压缩
颗粒破碎
分形
表面张力
sands； one-dimensional compression； grain crushing； fractals； surface tension；
