中文摘要：

为研究热-水-力耦合作用对岩石变形特性的影响,利用岩石THM耦合试验系统,对高温热处理后的岩石试样开展高孔隙水压力作用下三轴压缩试验,研究了热处理北山花岗岩在水-力耦合作用下的应力-应变曲线、力学特性、破坏特征以及损伤演化过程。研究结果表明,不同孔隙水压力作用下的s1-e1曲线在微裂隙压密和线弹性变形阶段基本重合,轴压增大到裂纹扩展阶段s1-e1曲线开始明显偏离,孔隙水压力越大,s1-e1曲线向1e轴偏离得越快,试样的峰值强度越低,峰值轴向应变越小,剪切破坏面倾角越陡,损伤演化的速度越快。研究成果表明:孔隙水压力对岩石损伤破坏的影响主要表现在加速岩石从裂纹不稳定扩展到宏观失稳的过程。

英文摘要：

This study aims to examine the influence of coupled thermo-hydro-mechanical processes on the stress-strain curves, mechanical properties, failure mode and damage evolution process. Using THM coupling system, triaxial compression tests were performed on the thermally-treated Beishan granite under high pore water pressure. The σ1-?1 curves are basically in coincidence with each other under different pore water pressure in the preexisting micro-crack closure region and the linear elastic region, which gradually start to move towards the ?1 axis as the cracks were initiated and propagated. Moreover, with the increase of pore water pressure, the peak strength and the corresponding axial strain decrease, while the inclination of the shear failure surface increases and the damage process evolves more quickly. It was demonstrated that the influence of pore water pressure on the rock damage and failure is mainly manifested in accelerating the process from crack growth to macro instability.