砂岩三轴循环加卸载变形特性分析及扩容逾渗模型研究

doi:10.13722/j.cnki.jrme.2024.0251

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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.

Key words： rock mechanics triaxial cyclic loading-unloading test dilatancy dilation angle damage percolation model

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	CHENG Jianchao1
	JIA Zhen1
	HOU Mengdong1
	LIU Shenggui1
	YANG Huan2
	3
	LIU Yintong1
	LI Yang4
	XUE Dongjie1
	3

Cite this article:

CHENG Jianchao1,JIA Zhen1,HOU Mengdong1, et al. Percolation modelling of dilation deformation evolution of sandstone under tri-axial cyclic loading-unloading[J]. , 2024, 43(11): 2687-2699.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0251 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2687

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