循环荷载下深部卸荷煤体力学特性及能量演化规律研究

doi:10.13722/j.cnki.jrme.2023.1159

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Abstract In order to explore the mechanical properties and energy evolution law of unloading coal under cyclic loading，the MTS816 rock mechanics test system was used to carry out triaxial cyclic loading tests with variable lower limit and constant lower limit of coal samples. The relationship between mechanical parameters of coal samples was analyzed by obtaining the whole process stress-strain curve，and the energy evolution law of coal samples during cycle loading process was studied based on the energy principle. The results show that：(1) Compared with the CG group，the peak stress increment extreme value of the coal samples under cyclic loading is 3.540 MPa，and the overall change is not large. The axial strain and lateral strain of the XH1 and XH2 groups are positively correlated and negatively correlated with the confining pressure，respectively. The volumetric strain of the XH1 group increases first and then stabilized and then increased，while that of the XH2 group increased first and then decreased and then increased. (2) The loading modulus of coal samples under cyclic loading is positively correlated with the number of cycles and negatively correlated with the stress level. Both the strain hardening modulus and the drop modulus are negatively correlated with the confining pressure. The high confining pressure condition weakens the ability to resist the inelastic model，and this weakening trend is independent of the stress path. The cyclic stress path has a significant effect on the deformation characteristics of coal samples. (3) The energy density of coal samples is higher under the action of constant lower limit path or high confining pressure. The dissipation energy density of coal samples in each cycle level is basically consistent with the input energy density，showing a trend of decreasing first and then stabilizing，and the elastic energy density is generally stable. (4) Under cyclic loading，the elastic energy density of coal samples accounts for more than 89.11% of the total input energy density，and the mean value of the two is linear. The total energy is mainly stored in the form of elastic energy，and this storage capacity is independent of confining pressure. The average value of dissipated energy density and elastic energy density changes in a power function type，and the energy competition ability of dissipated energy gradually increases with the increase of cyclic stress level.

Key words： rock mechanics coal cyclic loading mechanical properties energy evolution

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	WANG Lei
	ZOU Peng
	FAN Hao
	XIE Guangxiang
	JIN Kang
	ZHONG Hao

Cite this article:

WANG Lei,ZOU Peng,FAN Hao, et al. Study on mechanical properties and energy evolution of deep unloading coal under cyclic loading[J]. , 2024, 43(10): 2341-2355.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1159 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2341

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