深部原位岩石力学构想与初步探索

doi:10.13722/j.cnki.jrme.2020.0317

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Abstract Deep earth science is the basic of deep resource exploitation. One critical challenge is to ascertain the physical and mechanical behaviours of rocks from different depths under in situ geological conditions. Rock mechanical experiments and theoretical studies suitable for shallow resource mining are difficult to consider the effects of deep in situ geological conditions of different buried depths on the rock physical and mechanical characteristics and engineering. This paper puts forward the concept and research content of“deep in situ rock mechanics”. Using rock cores collected from 10 different depths(1 000 m to 6 400 m) of Songke second well，the different characteristics of rock mechanical behaviors at different buried depths are studied. An in situ stress restoration and reconstruction method is proposed to approximately simulate the influence of in situ geostress on rock physical and mechanical parameters. Uniaxial compression tests indicate that rock mechanical parameters increase nonlinearly with increasing the buried depth and hence，cannot be treated as constants. Triaxial compression experimental results manifest that rock mechanical parameters vary more obviously with the buried depth due to the geostress，which is different from those under uniaxial compression. Rock mechanical tests retaining the in situ geological condition suggest that the rock mechanical parameters can present more obvious nonlinear behaviors with increasing the buried depth in the case of geostress restoration and reconstruction. The peak strength and Young¢s modulus in the in situ stress restoration and reconstruction tests，showing a logarithmic function relationship with the buried depth，are larger than the results in the triaxial compression tests. Also，the post peak strain softening behavior in the in situ stress restoration and reconstruction tests is more obvious than that in the triaxial compression tests. Especially，when the burial depth exceeds 4 800 m，the influences of in situ stress restoration and reconstruction on Poisson¢s ratio，strain hardening modulus and post peak are more remarkable. This research can provide support for exploring deep scientific laws and improving deep resource acquisition capabilities.

Key words： rock mechanics deep resources different depths in situ geological condition deep rock mechanics retaining the in situ geological condition in situ stress restoration and reconstruction

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	Articles by authors
	XIE Heping1
	2
	3
	LI Cunbao1
	2
	GAO Mingzhong1
	2
	ZHANG Ru3
	GAO Feng4
	ZHU Jianbo1
	2

Cite this article:

XIE Heping1,2,3, et al. Conceptualization and preliminary research on deep in situ rock mechanics[J]. , 2021, 40(2): 217-232.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0317 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I2/217

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