为了研究非规则岩石颗粒接触破损力学行为及其分形特性,针对两河口天然灰岩颗粒进行了接触压缩试验。采用颗粒的表面分形维数、粗糙度和起伏度,定量表征了颗粒的细观形貌。试验结果表明:颗粒初始分形维数越大,首次破损力越小;加载后,颗粒接触局部范围内的分形维数变小,揭示了岩石颗粒细观形貌对接触破损力学行为的影响。同时利用非接触式数码成像仪动态追踪了试件表面的应变和位移,展示了颗粒接触破损全过程应变和位移的变化。结果显示,非规则岩石颗粒发生接触压缩时,局部应力水平较高,首先在接触局部区域发生破损。
Abstract
Contact compression test was conducted on natural limestone particles from Lianghekou to study the mechanical behavior and fractal characteristics of contact damage of irregular rock particles. The micro-morphology of particles was characterized by surface fractal dimension, roughness and undulation. The study revealed that the first damage force decreased with the increase of initial fractal dimension; the fractal dimension of particles in local contact range decreased after loading, which implied the influence of micro-morphology of rock particles on mechanical behavior of contact damage. Furthermore, the strain and displacement on specimen surface were traced dynamically by non-contact digital imager, which revealed the changes of strain and displacement in the whole process of particle contact test. The result shows that local stress level is much higher during contact compression between irregular rock particles. The contact damage first appears in local contact zone.
关键词
非规则灰岩颗粒 /
接触破损 /
细观形貌 /
分形维数 /
力学行为
Key words
irregular limestone particle /
contact damage /
micro-morphology /
fractal dimension /
mechanical behavior
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