基于原生节理统计和爆破裂纹模拟的堆石料块度分布预测

doi:10.13722/j.cnki.jrme.2016.1308

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Abstract The strict grading requirements of rockfill materials in hydropower engineering cause the difficulty to predict the fragmentation distribution. The statistical results of primary joints and the simulation on blasting cracks were employed together with the field investigation，indoor experiment，numerical simulation and engineering test to investigate preliminarily the blasting fragmentation distribution of rockfill materials. A set of fragment-size prediction methods were established. Firstly，the distribution network of natural joints of the study area was drawn through field investigation，and a three-dimensional jointed rock mass model based on the statistical results of primary joints was established. Then，the dynamic parameters of the rocks under the impact load were obtained with SHPB test device，and the extension ranges of blasting cracks were simulated with Ansys/Ls-Dyna. A three-dimensional jointed rock mass model after blasting in the investigation area was established considering comprehensively the information of primary joints and simulation results of blasting cracks. The output data of line-area-volume from the three-dimensional jointed rock model were used for block calculation with Matlab. The fifth longest side of rock blocks was taken as a fragmentation prediction index，and finally the predicted grading curve was obtained. Engineering application shows that the gradation prediction method is in line with the engineering practice. The overall prediction error is 5.5% in Jiang Tsui quarry which is much better than that of index based on diameters of equal volume sphere.

Key words： rock mechanics rockfill materials statistical analysis of joints simulation of blasting cracks fragmentation distribution gradation prediction indexes

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	Articles by authors
	WU Faming1
	2
	LIU Yonglin3
	LI Hongtao1
	2
	YAO Qiang1
	2

Cite this article:

WU Faming1,2,LIU Yonglin3, et al. Fragmentation distribution prediction of rockfill materials based on statistical results of primary joints and simulation of blasting cracks[J]. , 2017, 36(6): 1341-1352.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1308 OR http://www.rockmech.org/EN/Y2017/V36/I6/1341

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