Experimental Research on Strength Characteristics of Bulky Rock Material with Different Coarse Grain Content in Waste Pile of Mine

Abstract:

Bulky rock material of waste pile was composed of discarded rock and soil which was blasted and stripped from stope. It was characterized by dispersibility, complexity and variability. Shear strength index of bulky rock material was the main basis for analyzing slope stability of the waste pile. After the study on bulky rock material with different coarse grain content by indoor direct shear test, the results indicated that there was no obvious peak strength during the shear process, and variation of the shear displacement was slight in initial horizontal loading stage. Horizontal loading increased slowly and shear displacement had obvious change when shear displacement exceeded 5mm. Under the same normal stress, shear modulus G0.01 increased with the increase of coarse grain content when shear strain of specimen is 1/100. Shear modulus G0.01 of the specimen with same coarse grain content increased with the increase of normal stress, varying sensitive of G0.01 reduced when coarse grain content was larger. When the specimens with same coarse grain content were under failure, the shear modulus Gfailure was smaller than G0.01. Cohesive force c of the bulky rock material began to increase and then decrease with the increase of coarse grain content, and reached its maximum of 31.25KPa when the coarse grain content was 70%, internal friction angle increased with the increase of coarse grain content.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 295-300
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.295
• Online since: May 2012
• Authors: Jun Du, Ke Peng Hou, Wei Liang
• Keywords: Bulky Rock Material, Coarse Grain Content, Shear Modulus, Shear Strength

References

[1] Guanglong Huang, Jian Zhou, Xiaonan Gong: Stress-strain and Shear Strength Properties of Rock and Soil Materials of Waste Pile in Open Pit Mines. Journal of Zhejiang University (Engineering Science).2000,34(1), pp.54-59 (In Chinese).

[2] Xuebin Xie, Changliang Pan: Fractal Characteristics of Size Distribution and Shear Strength of Bulky Rock Material in Waste Pile of Mines. Rock and Soil Mechanics,2004(25),pp.287-291 (In Chinese).

[3] Zhigen Zhu, Aixiang Wu, Yong Xi: Analysis on Influence of Water Content on the Flowing Property of Bulk Ore - Rock. Mining Research and Development, 2006,26(6),pp.23-26. (In Chinese)

[4] Qingguo Guo: Engineering Character and Application of Aggregate Soil. Zhengzhou:Yellow River Water Press,1990(In Chinese).

[5] Houzhen Wei, Ren Wang, Mingjian Hu: Strength Behavior of Gravelly Soil with Different Coarse-grained Contents in Jiangjiagou Ravine. Rock and Soil Mechanics, 2008(29),pp.48-51(In Chinese).

[6] R.J. Marsal: Large-scale Testing of Rock Fill Material. Journal of the Soil Mechanics and Foundation Division, American Society of Civil Engineering, 1967,93(2),pp.27-43.

[7] B.O. Hardin: Crushing of Soil Particles. Journal of Geotechnical Engineering,1985,111(10),pp.1177-1192.

DOI: 10.1061/(asce)0733-9410(1985)111:10(1177)

[8] Xiling Guo, Hui Hu, Chenggang Bao: Experimental Studies of the Effects of Grain Breakage on the Dilatancy and Shear Strength of Rock Fill. Chinese Journal of Geotechnical Engineering, 1997,19(3),pp.83-88(In Chinese).

[9] Jingping Wu, Yao Chu, Zhigang Lou: Influence of Particle Breakage on Deformation and Strength Properties of Calcareous Sands. Chinese Journal of Geotechnical Engineering,1997,19(5),pp.49-55(In Chinese).

[10] Hanlong Liu, Hongyu Qin, Yufeng Gao: Experimental Study on Particle Breakage of Rockfill and Coarse Aggregates. Rock and Soil Mechanics,2005,4(26), pp.562-565(In Chinese).