礁灰岩孔隙结构表征及关键孔隙节点识别研究

doi:10.13722/j.cnki.jrme.2022.0571

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摘要珊瑚礁灰岩作为一种天然的多孔介质，孔隙结构复杂，对其宏观力学及渗流特性均有较大影响。为准确表征珊瑚礁灰岩孔隙结构，并探究其孔隙网络结构特征，以2种海南珊瑚礁灰岩样品为研究对象，利用 CT扫描和三维重构技术，构建礁灰岩的数字化三维模型及等效孔隙网络模型，分析礁灰岩孔隙结构的空间分布特征，并对其孔隙率、孔隙喉道尺寸及配位数等孔隙结构参数进行统计分析。构建礁灰岩内部孔隙结构的拓扑网络模型并开展复杂网络分析，获得礁灰岩孔隙网络的整体和个体属性指标，识别出影响网络特性的关键节点。研究表明：珊瑚礁灰岩孔隙率高、非均质性强，孔隙喉道尺寸及配位数分布符合对数正态分布规律；内部孔隙网络连通性较好，紧密性程度较高，且存在一些重要性较高的关键孔隙节点，对整体网络特性影响较大。

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	徐君1
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	黄昕1
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	王君朋1
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	张子新1
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	李昀3

关键词 ：岩石力学, 珊瑚礁灰岩, CT扫描, 孔隙结构, 复杂网络分析, 关键孔隙节点

Abstract：As a natural porous medium，coral reef limestone owns a complex pore structure，which lays great influences on its macroscopic mechanical and seepage properties. In order to accurately characterize the pore structure of coral reef limestone and explore the structural features of its pore network，this paper constructed digital 3D models and equivalent pore network models by combining CT scanning and 3D reconstruction techniques for coral reef limestone samples collected from Hainan. The spatial features of pore structure distribution of the two coral reef limestones were analyzed，and statistical analyzes were performed on pore structural parameters including porosity，pore throat size and coordination number. A topological network model of the internal pore structure was constructed to carry out complex network analyses，whereby the overall and individual property indicators of the core reef limestone pore network were obtained. The key nodes affecting the network characteristics were identified. The study shows that the coral reef limestone has high porosity and non-homogeneity，and the distributions of both pore throat size and coordination number conform to the log-normal distribution rule. The internal pore network is well connected with a high degree of compactness，and there exist some key pore nodes with high importance，which have a greater influence on the overall network characteristics.

Key words： rock mechanics coral reef limestone CT scanning pore structure complex network analysis key pore nodes

引用本文:

徐君1，2，黄昕1，2，王君朋1，2，张子新1，2，李昀3. 礁灰岩孔隙结构表征及关键孔隙节点识别研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3355-3366.
XU Jun1，2，HUANG Xin1，2，WANG Junpeng1，2，ZHANG Zixin1，2，LI Yun3. Characterization of coral reef limestone?s pore structure and identification of key pore nodes. , 2023, 42(S1): 3355-3366.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0571 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3355

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