基于CT-GBM重构法的花岗岩裂纹扩展规律研究

doi:10.13722/j.cnki.jrme.2021.0837

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摘要为从矿物尺度研究花岗岩在单轴压缩作用下的裂纹扩展规律，提出一种将高精度内部结构探测技术与PFC颗粒流数值模拟相结合的CT-GBM(computed tomography-grain based model)建模方法，用于构建基于真实矿物晶体结构的二维GBM模型。根据室内单轴压缩试验所获取的宏观力学参数及破坏形式对所建立模型的细观参数进行校正，并基于所校正模型探究花岗岩矿物晶体裂纹扩展规律。结果表明：CT-GBM建模方法可有效地模拟和复现花岗岩的硬脆特性及劈裂破坏形式。花岗岩在单轴压缩加载过程中主要经历4个阶段：无裂纹阶段、裂纹萌生阶段、裂纹稳定扩展阶段、裂纹非稳定扩展阶段。在破裂过程中，微裂纹萌生的次序分别是：晶间拉伸裂纹、晶间剪切裂纹、晶内拉伸裂纹、晶内剪切裂纹，并且以晶间拉伸裂纹为主。而从矿物类别角度考虑，微裂纹首先在长石矿物内部萌生，随后是石英和云母，其中汇聚成核的区域以云母和长石矿物为主。

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	李博1
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	梁秦源2
	周宇2
	赵程1
	伍法权2

关键词 ：岩石力学, CT, GBM, 单轴压缩试验, 裂纹扩展, 离散元模拟

Abstract：To study the crack propagation law of granite subject to unconfined compression at grain scale，a CT-GBM(Computed Tomography-Grain Based Model) method，combining the high-precision CT scanning technology and particle flow numerical simulation，was developed. This method can help to establish two-dimensional GBM model based on real mineral crystal structures. Mesoscopic mechanical parameters involved in the contact model were calibrated according to the results obtained from the unconfined compression tests. The cracking propagation law of granite mineral crystals was explored based on the calibrated model. The results show that the CT-GBM modeling method can effectively reproduce the hard and brittle mechanical properties and splitting failure mode of granite. The cracking process mainly includes four stages：crack-free stage，crack initiation stage，stable cracking stage and unstable cracking stage. The order of microcrack initiation is as follows：intergranular tensile crack，intergranular shear crack，intragranular tensile crack and intragranular shear crack，and the intergranular tensile cracks predominate. From the aspect of mineral type，the cracks first initiate inside the feldspar mineral，followed by quartz and mica，and the areas where microcracks converge and nucleate are dominated by mica and feldspar minerals.

Key words： rock mechanics CT GBM uniaxial compression test crack propagation discrete element simulation

引用本文:

李博1，2，梁秦源2，周宇2，赵程1，伍法权2. 基于CT-GBM重构法的花岗岩裂纹扩展规律研究[J]. 岩石力学与工程学报, 2022, 41(6): 1114-1125.
LI Bo1，2，LIANG Qinyuan2，ZHOU Yu2，ZHAO Cheng1，WU Faquan2. Research on crack propagation law of granite based on CT-GBM reconstruction method. , 2022, 41(6): 1114-1125.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0837 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I6/1114

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