不同应力路径下深埋软岩力学特性试验研究

doi:10.13722/j.cnki.jrme.2018.0973

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Abstract In order to investigate the difference of mechanical properties of deep-buried soft rock under different stress paths，the indoor triaxial loading test and confining pressure unloading test with a constant axial stress under different confining pressure levels，different unloading stress levels and different unloading rates were performed on the deep-buried soft rock samples from the right bank of the Danba Hydropower Station，and the microtopography of the unloading failure surface of the rock samples was scanned. Deformation，strength and failure characteristics of rock samples under different conditions were discussed. The results show that，compared with the triaxial loading test，the strength and the peak strain the soft rock with the same grade confining pressure under the unloading condition are reduced，and the stress-strain curve is converted from ductility to brittleness. The peak axial strain，the ultimate strength and the residual strength of the soft rock are positively correlated to the unloading stress level and the unloading rate. Compared with the Hoek-Brown empirical strength criterion，the Mohr-Coulomb strength criterion can better describe the soft rock strength characteristics. Different stress paths have different effects on the shear strength parameters. The unloading rate has a more significant effect on c value while the unloading stress level has a more significant effect on ? value. The failure mode of soft rock under both loading and unloading is shear failure. There is no derivatized microcrack except for the main crack under loading，but the low unloading stress level is more likely to induce new cracks than the high unloading stress level. The larger the unloading rate，the more severe the damage is. When the sample fails under a lower confining pressure unloading，there is a higher degree of freedom of failure surface microtopography evolution and the roughness of the failure surface is larger.

Key words： rock mechanics deep-buried soft rock stress paths unloading rate unloading stress levels microtopography

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	Articles by authors
	WANG Lehua1
	2
	NIU Caoyuan1
	ZHANG Bingyi1
	MA Yunbiao1
	YIN Sijie1
	XU Xiaoliang1

Cite this article:

WANG Lehua1,2,NIU Caoyuan1, et al. Experimental study on mechanical properties of deep-buried soft rock under different stress paths[J]. , 2019, 38(5): 973-981.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0973 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I5/973

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