分级循环加卸载下饱水细黄砂岩的变形破坏特征试验研究

doi:10.13722/j.cnki.jrme.2022.0904

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Abstract For water-rich tunnel in different construction stages under variable amplitude load disturbance of surrounding rock damage problem，by conducting graded loops and unloading test，analysis of loops and unloading stress-strain hysteresis curve，in the process of rock deformation parameters and macro fracture characteristics，revealing the grading loops and uninstall the deformation and failure regularity of saturated sandstone. The results show that with the increase of loading amplitude，the migration of hysteresis loop decreases first and then increases，the area of hysteresis loop increases step by step，and the axial strain of hysteresis loop develops as“sparse-dense-sparse”. The elastic modulus decreases step by step in the form of“sudden drop-slow drop-accelerated drop”，and Poisson?s ratio changes in the form of“step by step drop-relatively stable-rise”. The confining pressure increases the stiffness and deformation resistance of rock samples，the overall elastic modulus，the initial Poisson?s ratio，and the residual strain increase，but the weakening effect is obvious under the cyclic loading and unloading of the late yield section. The faster the loading rate is，the more obvious the load meshing friction effect is，the greater the average loading and unloading modulus is，and the less the irreversible deformation of the rock sample is，but the Poisson effect is not obvious. With the increase of confining pressure，the failure of sandstone changes from tension shear composite failure to compression shear failure；The smaller the load rate is，the more developed the main fracture is，the higher the penetration degree is，and the greater the scouring degree of the fracture surface is. The deformation and failure law of saturated sandstone revealed by the study has significant reference value for the deformation，damage and stability analysis of surrounding rock of rich water tunnel.

Key words： rock mechanics saturated sandstone hierarchical cyclic loading and unloading loading rate deformation characteristic parameters failure characteristics

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	YUAN Hechuan1
	2
	Abi Erdi1
	ZHANG Jie3
	CONG Yu4
	LIU Mingwei1
	2
	PU Yunjie1
	2
	LIN Haotian1
	2

Cite this article:

YUAN Hechuan1,2,Abi Erdi1, et al. Experimental study on deformation and failure characteristics of saturated sandstone under graded cyclic loading and unloading[J]. , 2023, 42(S2): 3943-3955.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0904 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/3943

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