不同频率增幅疲劳荷载下双裂隙花岗岩破裂演化声发射特性与裂纹形态研究

doi:10.13722/j.cnki.jrme.2020.0729

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摘要为了揭示疲劳加载频率对裂隙岩石破裂演化特征的影响，采用GCTS-RTR 2000岩石力学试验系统、实时声发射监测和试验后CT扫描相结合的手段，对预制裂隙逼近角为50°的矿山岩石开展了增幅疲劳加载力学试验。试验结果表明：(1) 随加载频率的增加，岩石的强度、变形和疲劳寿命随之增大，岩石体积应变增加速率呈现出稳定增加到突增的趋势，在最后一级疲劳水平变形迅速增加直至试样破坏。(2) 声发射振铃数、声发射能量变化、以及裂纹扩展行为受控于加载频率。累计振铃计数和累计能量随加载频率的增加而增加。频谱分析揭示了6种典型的裂纹演化类型，裂纹大小与频率呈负相关规律，随加载频率的增加，高频高幅信号所占比例降低，说明较高加载频率易形成大尺寸裂纹。(3) 岩桥段的CT扫描图像表明受疲劳荷载作用后裂纹网络规模随着加载频率的增加而增大，在低加载频率条件下，预制裂隙更容易沟通并贯穿于岩桥锁固段，然而，较高加载频率下裂隙不易沟通。试验结果有助于深入理解增幅疲劳荷载作用下不同加载频率对岩石疲劳力学行为及破裂演化的影响，可为岩体在增幅疲劳荷载作用下结构劣化监测预警、模式识别及岩体的长期稳定性提供必要的理论依据。

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	王宇1
	高少华1
	孟华君2
	龙大愚1

关键词 ：岩石力学, 增幅疲劳加载, 裂隙岩石, 破裂演化, 声发射, CT扫描

Abstract：In order to reveal the effect of dynamic loading frequency on fracture evolution characteristics of pre-flawed rocks，GCTS-RTR 2000 rock mechanics testing system，in-situ acoustic emission monitoring and post-test CT scanning were employed to carry out increasing-amplitude fatigue loading experiments on rock samples with an approaching angle of 50°. Testing results show that the strength，deformation and fatigue life increase with increasing the dynamic loading frequency. The growth rate of the volumetric strain shows a trend from steady increase to sudden increase，and at the final fatigue loading stage，the deformation increases sharply until the sample fails. AE count，AE energy change and crack propagation behavior are controlled by the dynamic loading frequency. The accumulative AE count and AE energy increase with increasing the loading frequency. The AE spectral frequency analysis reveals six kinds of crack types. The crack size is negatively correlated with the frequency and the proportion of the high frequency-high amplitude signal decreases with increasing the frequency, indicating that large-scaled cracks are prone to form under high loading frequency. CT images show that the scale of the crack network at the rock bridge segment increasing with increasing the loading frequency，and the coalescence of the pre-flaws easily occurs for rock subjected to low dynamic loading frequency conditions while is difficult under a high dynamic loading frequency. The testing results are helpful to improve the understanding of the influence of the dynamic frequency on the fatigue mechanical properties and the crack evolution behavior under increasing-amplitude fatigue loading and provide necessary theoretical basis for the monitoring and warning of structural deterioration，pattern recognition and long-term stability of rock mass under increasing-amplitude fatigue loading.

Key words： rock mechanics increasing-amplitude fatigue loading fractured rocks fracture evolution acoustic emission CT scan

引用本文:

王宇1，高少华1，孟华君2，龙大愚1. 不同频率增幅疲劳荷载下双裂隙花岗岩破裂演化声发射特性与裂纹形态研究[J]. 岩石力学与工程学报, 2021, 40(10): 1976-1989.
WANG Yu1，GAO Shaohua1，MENG Huajun2，LONG Dayu1. Investigation on acoustic emission characteristics and fracture network patterns of pre-flawed granite subjected to increasing-amplitude fatigue loads. , 2021, 40(10): 1976-1989.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0729 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I10/1976

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