北山沙枣园花岗岩岩体不同尺度结构面几何特征研究

doi:10.13722/j.cnki.jrme.2019.0015

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Abstract Granite is a candidate wall rock for high-level radioactive waste repository in China. The development of multi-scale discontinuities has a key impact on the closure of the repository. Taking grades II，III，IV-V discontinuities of Shazaoyuan granite masses in Beishan as the research objects，the trace length and occurrence parameters of multi-scale discontinuities were obtained based on the literature investigation and field measurement. The trace length distribution of multi-scale discontinuities was analyzed by mathematical statistics. Compared with the exponential distribution，the power law distribution is more applicable to the trace length of multi-scale discontinuities，showing scale-independent scaling uniformity with a scale of 2.236. Adopting the K-means algorithm based on particle swarm optimization，the dominant attitude of multi-scale discontinuities was identified. The dominant trend and dip angle of grades II，III and IV-V discontinuities are，respectively，NW320°and 56°–76°，NW304°–314°or NE43.5° and 71.3°–72.9°or 82.3°，and NE38.8°–41.5° and 70.0°–70.9°，showing a scale-dependent difference. Based on the“ladder”formation mechanism of discontinuities and the model of secondary discontinuities generated by strike-slip strain，a“ladder-shear”model was proposed to explain the combination morphological reasons of multi-scale discontinuities and to establish the genetic relationship of multi-scale discontinuities in Shazaoyuan granite.

Key words： rock mechanics Shazaoyuan discontinuity trace length occurrence combination form

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	Articles by authors
	HUO Liang1
	2
	WANG Guibin2
	YANG Chunhe2
	3
	WEI Xiang4
	TANG Minghao3

Cite this article:

HUO Liang1,2,WANG Guibin2, et al. Geometric characteristics of multi-scale discontinuities of Shazaoyuan granite masses in Beishan[J]. , 2019, 38(9): 1848-1859.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0015 OR http://www.rockmech.org/EN/Y2019/V38/I9/1848

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