| 孔槽式圆盘破坏特性与裂纹扩展机制颗粒流分析 |
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| 引用本文： | 黄彦华,杨圣奇.孔槽式圆盘破坏特性与裂纹扩展机制颗粒流分析[J].岩土力学,2014,35(8):2269-2277. |
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| 作者姓名： | 黄彦华 杨圣奇 |
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| 作者单位： | 1.中国矿业大学 深部岩土力学与地下工程国家重点实验室，江苏 徐州 221008； 2. 武汉大学 岩土与结构工程安全湖北省重点实验室，武汉 430072 |
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| 基金项目： | 国家重点基础研究发展计划973项目（No. 2014CB046905）；国家自然科学基金资助项目（No. 51179189）；教育部新世纪优秀人才支持计划项目(No.NCET-12-0961)；岩土与结构工程安全湖北省重点实验室开放研究基金项目（No. HBKLCIV201201）。 |
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| 摘 要： | 基于室内岩石类脆性材料圆盘试样巴西试验结果，利用颗粒流程序（PFC），获得一组能够反映其力学特征的细观参数。在此基础上，对孔槽式圆盘试样进行巴西试验模拟，分析了裂隙倾角和半径比变化对孔槽式圆盘试样力学参数和裂纹扩展规律的影响。孔槽式圆盘试样力学参数显著低于完整圆盘试样，降幅与孔槽几何参数密切相关。劈裂荷载随裂隙倾角的增大呈非线性变化，而随着半径比的增大呈近似线性减小规律。通过分析认为，在试验模拟范围内保持半径比不变，当裂隙倾角较小时，孔洞是主裂纹起裂的主要诱因；裂隙倾角较大时，裂隙成为主裂纹起裂的主要诱因。保持裂隙倾角不变，当半径比较小时，裂隙是主裂纹起裂的主要诱因；半径比较大时，孔洞成为主裂纹起裂的主要诱因。最后，从细观层面探讨了孔槽式圆盘试样裂纹扩展机制。
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| 关 键 词： | 脆性岩石 巴西试验 孔槽式圆盘 裂纹扩展 颗粒流程序 |
| 收稿时间： | 2013-09-29 |
Particle flow simulation of fracture characteristics and crack propagation mechanism of holed-cracked Brazilian disc specimen |
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| HUANG Yan-hua,YANG Sheng-qi.Particle flow simulation of fracture characteristics and crack propagation mechanism of holed-cracked Brazilian disc specimen[J].Rock and Soil Mechanics,2014,35(8):2269-2277. |
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| Authors: | HUANG Yan-hua YANG Sheng-qi |
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| Institution: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; 2. Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province, Wuhan University, Wuhan 430072, China |
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| Abstract: | Based on the experimental results of intact Brazilian disc of rock-like materials, a set of mecroscopic parameters in particle flow code (PFC) that can reflect the macroscopic mechanical behavior of rock-like materials under Brazilian test are obtained. Then PFC is used to simulate Brazilian test for holed-cracked Brazilian disc (HCBD) specimen. The effect of crack angle and radius ratio on the mechanical parameters of HCBD specimen is analyzed. Compared with intact specimen, the split load of HCBD specimen takes on a reducing tendency, and the reducing extent is closely related to pre-hole and crack parameters. The split load is non-linearly changed as crack angle increasing, but linearly decreases as the increase of radius ratio. In the range of simulation test, when the crack angle is smaller, the hole is the main reason resulting in the main crack initiation; while the crack angle is bigger, the reason of main crack initiation results from the pre-existing crack. When the crack angle is a constant and the radius is relatively smaller, the pre-existing crack is the main reason of main crack initiation; while the crack angle is bigger, the main crack initiation results from the pre-existing hole. Finally, the crack propagation mechanism of HCBD specimen is discussed. |
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| Keywords: | brittle rock Brazilian test holed-cracked Brazilian disc crack propagation particle flow code (PFC) |
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