摘要
岩石材料的破坏与能量的变化密切相关。利用伺服试验机对粉砂岩试样进行常规三轴加载,测量轴向和环向的应力、变形全程曲线,计算岩样屈服破坏过程中的能量变化。在轴向压缩破坏过程中,岩样必须持续吸收能量,主要用于克服内部剪切摩擦。三轴加载后保持轴向变形恒定降低围压,岩样同样会发生破坏;在此过程中,试验机不对岩样做功,而岩样环向膨胀对液压油做功持续释放能量。但岩样通过两种应力路径达到剪切破裂时,实际吸收的能量与围压成相同的线性关系。
The failure of rock is closely relative to energy change. The specimens of siltsand were pseudo-triaxially compressed in MTS servo-controlled testing machine, and the complete curves of stress and deformation in axial and circumference were measured to calculate the energy. The specimens failing in axial compression were absorbing energy continually to overcome the internal friction in rock. And the specimens failing in confining pressure reduction while keeping axial deformation constantly were releasing energy through its circumference expanding in hydraulic oil. However, the absorbed energy of specimens at crack point in the two loading paths has the same linear relation with confining pressure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第6期778-781,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
河南省杰出青年基金资助项目。
