基于三维GBM-FDM耦合的锚固单裂隙花岗岩压缩力学特性与止裂机制研究

doi:10.3724/1000-6915.jrme.2025.0151

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摘要为探究锚杆对裂隙花岗岩的锚固止裂效应，基于离散–连续耦合（GBM-FDM）技术构建了锚固单裂隙花岗岩晶质结构数值模型。通过对含45°倾角的裂隙花岗岩无锚和加锚试样开展无侧限单轴压缩试验，从力链演化、微裂纹活动等细观角度对锚固作用下的裂隙花岗岩的变形破裂过程及锚杆系统对裂隙花岗岩的锚固止裂效应作了系统研究。研究结果表明：无锚花岗岩试样在单轴压缩作用下呈现出沿着裂隙尖端区域扩展的破裂模式，而锚固试样内部破裂面相比无锚试样分布更广且更均匀。加锚试样内部高水平力链分布更均匀，表明锚杆结构在试样受载过程中改善了试样内部应力分布，因此其承载能力得到有效提高。此外，在相同荷载水平下，锚固试样相比无锚试样内部裂纹数量更少、力链均值更高及产生单位裂纹所需的力链值更高。

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	范豆豆1
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	蔚立元1
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	马林建1
	张涛2
	李洪亚1
	邓家军1

关键词 ：岩石力学, 花岗岩, 锚固止裂效应, 离散&ndash, 连续耦合, 力链演化, 裂纹扩展

Abstract：To investigate the anchorage anti-fracture effect of fissured granite, a numerical model representing the crystalline structure of anchored single-fissured granite was constructed using the discrete-continuous coupling (GBM-FDM) method. Uniaxial compression tests were conducted on both unanchored and anchored samples of single-fissured granite with a 45° inclination angle. The failure process of fissured granite under uniaxial compression and the anchorage anti-fracture effect of the anchor system on single-fissured granite were systematically examined from mesoscopic perspectives, focusing on force chain evolution and micro-crack propagation. The results indicated that the failure pattern of the unanchored sample under uniaxial compression exhibited significant propagation along the fissure tip region. In contrast, the internal fractures of the anchored sample were distributed more widely and uniformly compared to the unanchored sample. The force chain distributions within the anchored samples were more uniform, suggesting that the anchor structure enhances the stress distribution during the loading process, thereby effectively improving the load-carrying capacity. Additionally, the number of cracks in the anchored samples was lower, while the mean value of the force chain was higher, and the force chain value required to generate a single crack was greater in anchored samples than in unanchored ones at the same load level.

Key words： rock mechanics granite anchorage anti-fracture effect discrete-continuous coupling force chain evolution crack propagation

引用本文:

范豆豆1，2，蔚立元1，2，马林建1，张涛2，李洪亚1，邓家军1. 基于三维GBM-FDM耦合的锚固单裂隙花岗岩压缩力学特性与止裂机制研究[J]. 岩石力学与工程学报, 2025, 44(10): 2761-2774.
FAN Doudou1, 2, YU Liyuan1, 2, MA Linjian1, ZHANG Tao2, LI Hongya1, DENG Jiajun1. Compressive mechanical properties and anti-fracture mechanisms of anchored single-fissured granite using three-dimensional coupled GBM-FDM methodology. , 2025, 44(10): 2761-2774.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0151 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I10/2761

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