压缩作用下砂岩变形破坏过程中的能量特征

Energy properties of sandstone in the process of deformation failure under compression condition

为探索岩石在载荷作用下变形破坏过程中能量的能量演化机制,对红砂岩进行了单轴、三轴压缩试验,获得了岩石加载过程中能量随应力、应变的演化与分配规律.结果表明:岩石的变形破坏过程是能量耗散与释放的结果;单轴压缩及较低围压下岩石在峰值后积聚的能量突然释放,这也是其呈现脆性破坏的主要原因;在较高围压下,岩石峰后能量随围压的升高由释放向逐渐耗散转变.

In order to explore energy evolution mechanism of sandstone in the process of defbrmation tallure under compression condition, by using the MTS815 servo-controlled mechanical testing machine, a series of uniaxial and triaxial compression tests on red sandstone were carried out. The energy evolution and distribution law of rock along with the stress, and strain in the process of loading were obtained. Results show that the deformation failure of the rock is the results of energy dissipation and release. Under uniaxial compression and low confining pressure triaxial compression, the accumulated energy was suddenly release after the peak stress, which is the main reasons why it presents brittle failure; while, under the high confining pressure, rock energy after the peak stress along with the increase of confining pressure from the release to gradually dissipated.