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为研究花岗岩的脆塑性转化和失稳型式 ,在固体围压介质三轴实验系统上进行了 3组高温高压实验。结果表明 ,温度小于 30 0℃时花岗岩为脆性破裂 ,大于 80 0℃时为塑性变形 ,在30 0～ 60 0℃ ,花岗岩为半脆性破裂和碎裂流动 ,在 60 0～ 80 0℃ ,花岗岩为半脆性流动。花岗岩的渐进破坏发生在低压区域 ;突发失稳发生在室温高压 (≥ 30 0MPa)和高温高压 (5 5 0℃ 60 0MPa～65 0℃ 70 0MPa)两个区域 ;在突发失稳与渐进破坏区域之间存在大范围的准突发失稳区。在实验温压范围内 ,影响花岗岩脆塑性转化的首要因素是温度 ,其次是围压 ;而花岗岩的失稳型式同时取决于围压和温度
In order to study the brittle-plastic transformation and instability patterns of granite, three sets of high temperature and high pressure experiments were carried out on the three-axis solid confining media triaxial experimental system. The results show that the granite is brittle fracture when the temperature is less than 300 ℃, and it is plastic deformation when the temperature is higher than 80 ℃. The granite is semi-brittle and fragmented at 30 0 ~ 600 ℃. For semi-brittle flow. The progressive failure of granite occurred in the low pressure region. The sudden failure occurred in two regions of room temperature and high pressure (≥ 30 0MPa) and high temperature and pressure (500 ℃, 60 0MPa-65 0 ℃, 70 0MPa) There is a wide range of quasi-sudden destabilization zones between the damaged areas. In the range of experimental temperature and pressure, the primary factor affecting the brittle plastic transition of granite is temperature, followed by the confining pressure. The instability type of granite also depends on the confining pressure and temperature