基于能量释放率的不同赋存深度砂岩脆性指数研究

doi:10.13722/j.cnki.jrme.2020.0608

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Abstract To establish brittleness index of sandstone at different buried depths，the uniaxial compression test was carried out on the rock samples from different depths in Buertai coal mine. According to the stress-strain curve characteristics of rock samples at different buried depths，an energy evolution model of the stress-strain curve at different buried depths was constructed based on the positive and negative correlation of stress and strain. Based on the energy release rate，the brittleness index of rock samples at different buried depths was established and verified theoretically. The results show that rock samples at different buried depths correspond to four types of curves. Types I and IV curves are located at the shallowest and deepest buried depths，101.6–203.2 m and 509.8–589.3 m respectively. Type II curve is distributed at various depths，and type III curve is mainly distributed at 406.4–589.3 m. Different curve shapes at different depths correspond to four energy evolution models. The total strain energy increases in a“S”shape，and the elastic energy evolution curve is similar to the stress-strain curve. The dissipation energy of types II and III curves increases step by step with increasing the strain，and the dissipation energy of type IV curve increases in a“L” shape with increasing the strain，in which both surface energy and released elastic energy alternate with plastic energy while the strain increases. The brittleness index increases with increasing the buried depth, showing a quadratic function relationship. The corresponding average values are 0.77，1.01，0.93，3.66，9.94 and 11.55 respectively. The maximum energy release rate and brittleness index of type IV curve with average values of 555.27 and 30.98 respectively are much higher than those of the other three curves. In addition，brittleness index partitions of sandstones from different buried depths are quite different. The sandstone layer is weak brittleness when the buried depths are 101.6 m and 317.3 m，medium brittleness for 203.24 m depth and strong brittleness at the buried depths of 406.42 m and 589.35 m.

Key words： rock mechanics sandstone buried depth brittleness index energy release rate energy evolution

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	ZHAO Yixin1
	2
	WANG Xiaoliang1
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	GUO Yanding3
	HAO Xianjie1
	2

Cite this article:

ZHAO Yixin1,2,WANG Xiaoliang1, et al. Brittleness index of sandstones from different buried depths based on energy release rate#br#[J]. , 2021, 40(2): 248-262.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0608 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I2/248

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