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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摘要花岗岩是我国高放废物处置库的候选围岩，其中发育的多尺度结构面对处置库的密闭性有关键影响。以北山沙枣园岩体为研究区域，选择II，III，IV～V级结构面为研究对象，在调研的基础上，采用野外测量的方法，获取多尺度结构面的迹长和产状参数。运用数理统计方法分析多尺度结构面迹长分布，相较于指数分布，幂律分布更符合多尺度结构面的迹长分布，呈现尺度无关的标度统一性，标度为2.236。采用基于粒子群算法的K-means聚类算法，分析多尺度结构面的优势产状，II级结构面的优势走向在NW320°附近，倾角为56°～76°，III级结构面的优势走向为NW304°～314°和NE43.5°，倾角分别为71.3°～72.9°和82.3°，IV～V级结构面最优结构面走向为NE38.8°～41.5°，优势倾角为70.0°～70.9°，呈现尺度相关的差异性。基于结构面“梯子”形态产生机制，结合大尺度结构面走滑应变生成次级结构面的模型，提出“梯子–剪切”模式，解释不同尺度结构面组合形态原因，建立沙枣园岩体多尺度结构面的成生联系。

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	霍亮1
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	王贵宾2
	杨春和2
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	魏翔4
	唐明豪3

关键词 ：岩石力学, 沙枣园, 结构面, 迹长, 产状, 组合形态

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

引用本文:

霍亮1，2，王贵宾2，杨春和2，3，魏翔4，唐明豪3. 北山沙枣园花岗岩岩体不同尺度结构面几何特征研究[J]. 岩石力学与工程学报, 2019, 38(9): 1848-1859.
HUO Liang1，2，WANG Guibin2，YANG Chunhe2，3，WEI Xiang4，TANG Minghao3. Geometric characteristics of multi-scale discontinuities of Shazaoyuan granite masses in Beishan. , 2019, 38(9): 1848-1859.

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

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