巴东组泥岩水作用的特征强度及其能量演化规律研究

doi:10.13722/j.cnki.jrme.2019.0654

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Abstract In order to study the influence of water saturation on the strength parameters，deformation characteristics and energy evolution of Badong formation mudstone as well as the internal relation among the mechanical properties，energy evolution and microcrack development，uniaxial compression tests of mudstone under natural and saturated states are carried out，and the characteristic strength is determined by strain curve method. Through the quantitative comparative analysis of the deterioration law of the characteristic strength and the numerical difference of energy parameters as well as in-depth exploration of energy transformation characteristics in the process of water-rock interaction，the energy explanation of mudstone saturation softening mechanism is given. It is found that the effect of saturation on the mechanical properties of mudstone is manifested by reduction of the characteristic strength，weakening of the brittle deformation，enhancement of the plastic deformation and difference among deformation stages. Meanwhile，the influence of saturation on the energy evolution presents weakening of energy absorption and release properties，enhancement of energy dissipation properties and different energy distribution rules of each stage after saturation. On the basis of the experimental data，the numerical compression tests under the same water conditions are performed by means of particle flow code software，and the interaction between the development characteristics of micro-cracks and energy evolution of samples is analyzed to reveal the micro-mechanism of mudstone energy evolution. The results show that the particle flow theory is superior in explaining the damage mechanism of rocks from the perspective of meso-mechanics and provides a new means for the micro-study of rock heterogeneity.

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	LIU Wanli
	YAN Echuan
	DAI Hang
	DU Yi
	XIAO Weibo
	ZHAO Song

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LIU Wanli,YAN Echuan,DAI Hang, et al. Study on characteristic strength and energy evolution law of Badong formation mudstone under water effect[J]. , 2020, 39(2): 311-326.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0654 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I2/311

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