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| Percolation modelling of dilation deformation evolution of sandstone under tri-axial cyclic loading-unloading |
| CHENG Jianchao1，JIA Zhen1，HOU Mengdong1，LIU Shenggui1，YANG Huan2，3，LIU Yintong1，LI Yang4，XUE Dongjie1，3 |
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. School of Civil and Resource Engineering，University of Science and Technology Beijing，Beijing 100083，China；3. State
Key Laboratory of Water Resource Protection and Utilization in Coal Mining，National Institute of Clean-and-Low-
Carbon Energy，Beijing 102211，China；4. School of Resources，Environment and
Safety Engineering，Hunan University of Science and Technology，
Xiangtan，Hunan 411201，China) |
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Abstract To investigate the mechanical behavior of the underground reservoir?s floor in a coal mine subjected to combined dry-saturated cycling and disturbances of mining-induced stress，triaxial cyclic loading-unloading tests of sandstone under dry and saturated conditions are conducted using the MTS815 testing system，to analyze the damage evolution characteristics and the critical jumping behavior from linear to non-linear transition of dilatancy at pre- and post-failure. By introducing a damage variable dependent on the plastic volumetric strain，a critical index-based percolation model is established to describe the nonlinear dilatancy phenomenon. The experimental results show that the brittle behavior of sandstone is weakened by water saturation and a competitive relationship between the water-weakening effect and the hydraulic pressure-strengthening effect is observed. In addition，the maximum dilation angle is suggested as a criterion to divide the dilating deformation into the fracture growth and the shear-induced slippage. The damage variable?s evolution of sandstone under dry states also presents a critical jumping phenomenon at the transition boundary between two stages，while under saturation conditions it shows a gradual transition. In the fracture growth stage，the proposed percolation model fits the testing data well，which confirms the validity of proposed percolation model. Moreover，another percolation model to describe the volumetric strain evolution considering the damage variables was also derived.
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2024, Vol. 43 
