大理岩卸荷破坏变形及能量特征研究

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Abstract Pre-peak and post-peak strength unloading failure experiments on marble under constant axial pressure were conducted. The characteristics of deformation and energy evolution during the process of marble failure were studied. Results show that the lateral deformation decreases with the increase of unloading rate. The axial deformation is relatively small. It has no relation with unloading rates under the condition of constant axial pressure. The failure mode is typical shear failure under the pre-peak or post-peak strength unloading. Unloading after the peak strength leads to obviously conjugate shear zone. Marble unloading failure process can be divided into three stages according to energy evolution：energy accumulation stage，energy dissipation stage and energy release stage. The faster the unloading rate，the more quickly and more intensely the elastic strain energy releases. The change rate of dissipated energy goes up with the unloading rate increase. And it is ten times larger than the rate of elastic strain energy. Dissipation energy plays a dominant role in the rock's failure process. The rapid energy dissipation is the main feature of marble unloading failure.

Key words： rock mechanics unloading confining pressure experiment constant axial pressure energy

Received: 20 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/2808

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