Abstract:The particle breakage directly modifies the structure of the rockfill, influencing its dilatancy, friction angle, strength, permeability and creep deformation. However, the breakage law of the rockfill during shearing is still unclear. The particle breakage of the basalt rockfill of Gushui concrete face rockfill dam during the sample preparation, consolidation and drained triaxial shearing is studied by using the consolidated-drained triaxial tests. The research shows that the sample preparation of the rockfill generates notable particle breakage. The isotropic consolidation of the sample generates little particle breakage. Under low confining pressure, the particles can freely roll over and slide, and there is little particle breakage during the shearing. Under high confining pressure, the rolling and sliding of the particles are limited, which increases the interlocked force among the particles. And the particle breakage increases with shear strain. During the particle breakage, the large particles break first. The diameter of the broken particle decreases with the increasing confining pressure. The content of the particle less than 0.5 mm always increases with the increasing pressure and the amplification also increases with the increasing confining pressure. Under high confining pressure, the stress and shear strain both influence particle breakage. The relationship between the relative breakage parameter Br and the shear strain under the same confining pressure can be described by hyperbolic formula.
贾宇峰, 王丙申, 迟世春. 堆石料剪切过程中的颗粒破碎研究[J]. 岩土工程学报, 2015, 37(9): 1692-1697.
JIA Yu-feng, WANG Bing-shen, CHI Shi-chun. Particle breakage of rockfill during triaxial tests. Chinese J. Geot. Eng., 2015, 37(9): 1692-1697.
[1] LADE P V, YAMAMURO J A, BOPP P A. Significance of particle crushing in granular materials[J]. Journal of Geotechnical Engineering, 1996, 122(4): 309-316. [2] 王振兴, 迟世春, 王 峰. 堆石料流变试验的颗粒破碎研究[J]. 水利与建筑工程学报, 2012, 10(5): 103-106. (WANG Zhen-xing, CHI Shi-chun, WANG Feng. Experimental study for rheological particle breakage of rockfill materials[J]. Journal of Water Besources and Architectural Engineering, 2012, 10(5): 103-106. (in Chinese)) [3] HARDIN B O. Crushing of soil particles[J]. Journal of Geotechnical Engineering, 1985, 111(10): 1177-1192. [4] 米占宽, 李国英, 陈铁林. 考虑颗粒破碎的堆石体本构模型[J]. 岩土工程学报, 2007, 29(12): 1865-1869. (MI Zhan-kuan, LI Guo-ying, CHEN Tie-lin. Constitutive model for rockfill material considering grain crushing[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(12): 1865-1869. (in Chinese)) [5] 丁树云, 蔡正银, 凌 华. 堆石料的强度与变形特性及临界状态研究[J]. 岩土工程学报, 2010, 32(2): 248-252. (DING Shu-yun, CAI Zheng-yin, LING Hua. Strength and deformation characteristics and critical state of rock fill[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(2): 248-252. (in Chinese)) [6] 陈生水, 韩华强, 傅 华. 循环荷载下堆石料应力变形特性研究[J]. 岩土工程学报, 2010, 32(8): 1151-1157. (CHEN Sheng-shui, HAN Hua-qiang, FU Ha. Stress and deformation behaviors of rockfill under cyclic loadings[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(8): 1151-1157. (in Chinese)) [7] BUDDHIMA Indraratna, WADUD Salim. Modelling of particle breakage of coarse aggregates incorporating strength and dilatancy[J]. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering, 2002, 155(4): 243-252. [8] 孔德志, 张丙印, 孙 逊. 人工模拟堆石料颗粒破碎应变的三轴试验研究[J]. 岩土工程学报, 2009, 31(3): 464-469. (KONG De-zhi, ZHANG Bing-yin, SUN Xun. Triaxial tests on particle breakage strain of artificial rockfill materials[J]. Journal of Geotechnical Engineering, 2009, 31(3): 464-469. (in Chinese)) [9] 贾宇峰, 迟世春, 林 皋. 考虑颗粒破碎的堆石料剪胀性统一本构模型[J]. 岩土力学, 2010, 31(5): 1381-1388. (JIA Yu-feng, CHI Shi-chun, LIN Gao. Dilatancy unified constitutive model for coarse granular aggregates incorporating particle breakage[J]. Rock and Soil Mechanics, 2010, 31(5): 1381-1388. (in Chinese))