Loading Capacity and Deformation Characteristics of Tailings Based on a Fractal Geometrical Analysis of the Particle Microstructure

Minerals

Qiangui Zhang²  Guangzhi Yin¹  Xiangyu Fan²  Zuoan Wei¹  Wensong Wang¹  Wen Nie¹ 

[1] State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; E-Mails:;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China; E-Mail:

关键词: tailings;    granular matter;    micro-structure;    loading capacity;    fractal theory;   

DOI  :  10.3390/min5010086

来源: mdpi

【 摘 要 】

The failure of a tailing dam occurs due to damage to the particles’ micro-structure. Understanding the deformation characteristics of the particle’ micro-structure is important for understanding the mechanics of instability in tailing dams. In our study, a series of experiments was conducted using a testing apparatus for micro-mechanics and the deformation of tailings from the Huangcaoping tailing pond, Sichuan Province, China to investigate the loading capacity, micro-structure and deformation features of tailing particles. The latter two were analyzed quantitatively using concepts from fractal geometry. The results demonstrate that: (1) the structural loading capacity of tailings increases first and then decreases slightly with increasing particle size; (2) the particle micro-structure of the four tailing samples from the Huangcaoping tailing pond is described in terms of the fractal dimension based on the perimeter and area (D-value), which is between 1.288 and 1.533; (3) as the axial stress increases, the D-value gradually decreases along a wavy line with a decreasing rate of change; (4) under the same axial strain, the D-value first decreases and later increases slightly as the particle size increases; and (5) the number of fractured particles increases with the particle size.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.