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| Conceptualization and preliminary research on deep in situ rock mechanics |
| XIE Heping1，2，3，LI Cunbao1，2，GAO Mingzhong1，2，ZHANG Ru3，GAO Feng4，ZHU Jianbo1，2 |
(1. Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization，Institute of Deep Earth Sciences and Green Energy，Shenzhen University，Shenzhen，Guangdong 518060，China；2. College of Civil and Transportation Engineering，Shenzhen Key Laboratory of Deep Earth Engineering Sciences and Green Energy，Shenzhen University，Shenzhen，Guangdong 518060，China；3. MOE Key Laboratory of Deep Earth Science and Engineering，Sichuan University，Chengdu，Sichuan 610065，China；4. State Key Laboratory for Geomechanics and Deep Underground Engineering，
China University of Mining and Technology，Xuzhou，Jiangsu 221116，China)
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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.
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2021, Vol. 40 
