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| Study on concept and progress of in situ fidelity coring of deep rocks#br# |
| XIE Heping1，2，3，GAO Mingzhong1，2，3，ZHANG Ru3，CHEN Ling3，LIU Tao3，LI Cunbao1，2，#br# LI Cong1，2，3，HE Zhiqiang1，2，3#br# |
| (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. Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy，College of Civil and Transportation Engineering，Shenzhen University，Shenzhen，Guangdong 518060，China；3. Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract The non-linear behavior of rock material in deep in-situ environment is very prominent. The existing rock mechanics theories are mostly based on the data analysis of ordinary cores obtained by drilling，which ignore the effects of in-situ environmental parameters (temperature，penetration pressure，etc.) at different depths and，hence，are no longer applicable to deep resource exploitation. A concept of coring with retaining in-situ conditions，including the pore pressure，temperature，quality，luminosity and humidity of original cores，is proposed，and the principle，technology and implement plan of coring with retaining in-situ conditions of deep rocks are developed. Based on the Steinmetz solid geometric principle，a self-triggered pressure control technology of deep rocks with a capacity of maintaining 100 MPa pressure of key parts is proposed through numerical simulation and physical test. An active and passive combined temperature maintaining technology is developed for thermal insulation system，and the maintaining temperature ranges from －8.8 ℃ to 100.0 ℃ in laboratory. The principle and method of cross-linking sealing film are presented. The polymer barrier film is formed after the reaction between A and B liquids，which can retain the quality，luminosity and humidity of in-situ cores in laboratory. This research can provide support for learning physical and mechanical characteristics for deep in-situ rocks at different depths，constructing new rock mechanical theory system，improving the deep resources exploration capability and exploring the mysteries of the deep earth.
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2020, Vol. 39 
