高温4 000 m静水压力下钻进过程中花岗岩体变形特征

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Abstract The stability of borehole will influence the construction progress of deeply drilling hole into the hot granite reservoir so as to extract hot energy from hot dry rock. However，the stability of borehole is subjected to the deformation of surrounding rock. The 600 ℃ 20 MN servo-controlled rock triaxial testing machine with high temperature and pressure developed by China University of Mining and Technology was utilized to investigate the deformation characteristics of surrounding rock of drilling hole at high temperature and pressure. The experiment on the deformation characteristics of granite in the process of drilling at 4 000 m in-situ hydrostatic pressure and different high temperatures was carried out. The results indicate that：(1) A clear creep process occurs in the process of drilling hole in granite at constant pressure and temperature，while the axial and lateral deformations appear the whole initial and secondary creep processes. (2) The axial and lateral strains increase with temperature rising in the process of drilling at 4 000 m hydrostatic pressure and different high temperatures；and there exists a critical temperature which ranges from 150 ℃ to 300 ℃. (3) Tertiary creep of granite deformation clearly happens at 300 ℃ in the process of drilling hole at 4 000 m hydrostatic pressure；and creep damage occurs at 500 ℃.

Key words： rock mechanics high temperature and pressure granite drilling deformation critical temperature hot dry rock

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	Articles by authors
	FENG Zijun1
	ZHAO Yangsheng1
	ZHAO Jinchang1
	WAN Zhijun2
	DONG Fuke3
	ZHANG Yuan2

Cite this article:

FENG Zijun1,ZHAO Yangsheng1,ZHAO Jinchang1, et al. GRANITE DEFORMATION CHARACTERISTICS IN DRILLING PROCESS AT 4 000 m HYDROSTATIC PRESSURE AND HIGH TEMPERATURE[J]. , 2010, 29(S2): 4108-4112.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4108

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