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利用MTS815混凝土与岩石力学试验系统和PCI-2三维定位实时监测系统对花岗岩卸荷破坏进行了声发射试验,得到了其卸荷破坏全过程变形特性和声发射特征,探讨了应力与应变、声发射数与应力、声发射率与应力、声发射数与时间以及声发射率与时间之间的关系.研究表明,岩石在卸荷方式下的破坏大多表现为脆性破坏,而且围压越大,脆性破坏特征越明显;对于1-1试件,破坏前在应力大于310MPa左右或在时间大于300s左右的范围内声发射数、声发射率开始出现激增现象,表明进入该阶段岩石内部破裂开始加速发育、扩展,最终导致岩石的破坏.研究成果对具有同类岩体的工程具有重要的参考价值.
Using MTS815 concrete and rock mechanics test system and PCI-2 three-dimensional positioning real-time monitoring system, the acoustic emission tests of granite unloading damage were carried out. The whole deformation and acoustic emission characteristics of unloading failure were obtained. The effects of stress and strain, The relationship between the number of emission and the stress, the acoustic emissivity and stress, the number and time of acoustic emission and the acoustic emissivity and the time.The results show that the failure of rock under unloading mode mostly shows brittle failure, and the larger the confining pressure, For the 1-1 specimen, the acoustic emissivity began to increase sharply before the damage occurred at a stress greater than 310 MPa or at a time greater than about 300 s, indicating that the rock burst into the stage of acceleration Develop and expand, eventually lead to the destruction of the rock.The research results have important reference value for the engineering with similar rock mass.