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.
Key words
irregular limestone particle /
contact damage /
micro-morphology /
fractal dimension /
mechanical behavior
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] CAMBOU B,JEAN M,RADJAI F. Micromechanics of Granular Materials[M].Hoboken: John Wiley & Sons,2009.
[2] 刘汉龙, 秦红玉, 高玉峰, 等. 堆石粗粒料颗粒破碎试验研究[J]. 岩土力学, 2005, 26(4): 562-566.
[3] 李海腾, 徐远杰, 余聪聪,等. 非规则岩质颗粒形貌对其破碎力的影响[J]. 武汉理工大学学报, 2015, 37(5):64-69.
[4] NAKATA Y, KATO Y, HYODO M,et al. One-dimensional Compression Behaviour of Uniformly Graded Sand Related to Single Particle Crushing Strength[J]. Soils and Foundations, 2001, 41(2):39-51.
[5] MCDOWELL G R, KHAN J J. Creep of Granular Materials[J]. Granular Matter, 2003, 5(3):115-120.
[6] KARIMPOUR H, LADE P V. Time Effects Relate to Crushing in Sand[J]. Journal of Geotechnical & Geoenvironmental Engineering, 2012, 136(9):1209-1219.
[7] 王占军,陈生水,傅中志.堆石料流变的黏弹塑性本构模型研究[J].岩土工程学报,2014,36(12):2188-2194.
[8] 日本土质工学会. 粗粒料的现场压实[M]. 郭熙灵, 文 丹,译. 北京: 中国水利水电出版社, 1998.
[9]尹贤刚, 李庶林, 唐海燕. 岩石破坏声发射强度分形特征研究[J]. 岩石力学与工程学报, 2005, 24(19):3512-3516.
[10]XIE H, WANG J. Direct Fractal Measurement of Fracture Surfaces[J]. International Journal of Solids and Structures, 1999, 36(20): 3073-3084.
[11]张 皓. 准脆性材料损伤演化的试验力学研究[D]. 天津: 天津大学, 2014.
PDF(2647 KB)
