爆堆块度分布对孔隙结构分形特征影响研究

doi:10.3724/1000-6915.jrme.2024.0472

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摘要为了研究爆堆块度分布与内部孔隙结构之间的关系，利用核磁共振(NMR)试验对爆堆相似模型进行孔隙测量及成像。通过Box-counting方法量化和比较模型内部孔隙结构的复杂度，得出爆堆块度分布规律；通过模拟和室内相似试验得出爆堆内部孔隙结构分布状态，结果表明：(1) 对比完整岩石，散体的孔隙度明显偏高，最大可达到81.55%，大粒径碎石内部孔隙的连通性更好，小孔隙和中孔隙T2谱谱峰面积与总谱峰面积之比超过80%，碎石粒径大小影响散体孔隙数量和孔径分布；(2) 散体内部孔隙符合分形规律，极小粒径碎石试件标准差超过0.01，且试件分形维数拟合值R2均小于0.9，散体内部孔隙均匀程度与极小粒径碎石含量关系密切；(3) 散体自身存在沉积效应，极小粒径在试件端部占比超过90%，形成明显分层现象；综合矿山现场及模拟后的爆堆块度分布状况，验证了爆堆 “由低到高，由小到大”的纵向分布状态。极小粒径碎石的沉积效应对爆堆块度分布具有显著意义。

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	崔哲森1
	柴青平2
	刘志龙3
	王雪松4
	袁增森1
	徐振洋1
	5
	6

关键词 ：采矿工程, 块度分布, 核磁共振, 分形特征, 孔隙结构, 沉积效应

Abstract：To investigate the correlation between fragment size distribution and the internal pore structure of muck-piles，Nuclear Magnetic Resonance(NMR) testing was employed to measure and image the pore structure of muck-pile analogues. The complexity of the internal pore structure within these models was quantified and analyzed using the Box-counting method，revealing the underlying patterns of muck-pile fragment size distribution. Through simulations and indoor analogue experiments，the distribution of internal pore structures within muck-piles was elucidated. The results indicate that：(1) compared to intact rock，the porosity of granular materials(muck-pile constituents) is significantly higher，reaching a maximum of 81.55%. The connectivity of pores within larger gravel particles is superior，with the ratio of small and medium pore T2 spectrum peak areas to the total peak area exceeding 80%. The size of gravel particles significantly influences the number of pores and the pore size distribution in granular materials. (2) The internal pores of granular materials adhere to fractal principles. The standard deviation for extremely small-sized gravel specimens exceeds 0.01，and the fitting values of the fractal dimension R2 for these specimens consistently fall below 0.9，suggesting a close relationship between the uniformity of internal pores and the content of extremely small-sized gravel. (3) Granular materials exhibit a sedimentation effect，with extremely small-sized particles accounting for over 90% at the ends of the specimens，resulting in a distinct stratification phenomenon. By integrating on-site mine observations with simulated muck-pile fragment size distributions，the vertical distribution pattern of“from low to high and from small to large”within muck-piles was verified. The sedimentation effect of extremely small-sized gravel significantly impacts the fragment size distribution of muck-piles.

Key words： mining engineering block distribution nuclear magnetic resonance fractal characteristics pore structure deposition effect

引用本文:

崔哲森1，柴青平2，刘志龙3，王雪松4，袁增森1，徐振洋1，5，6. 爆堆块度分布对孔隙结构分形特征影响研究[J]. 岩石力学与工程学报, 2025, 44(S1): 134-145.
CUI Zhesen1，CHAI Qingping2，LIU Zhilong3，WANG Xuesong4，YUAN Zengsen1，XU Zhenyang1，5，6. Study on the influence of fragmentation distribution of blasting heap on fractal characteristics of pore structure. , 2025, 44(S1): 134-145.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0472 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/134

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