孔隙水压与轴向荷载作用下试件的破坏特征研究

doi:10.11799/ce201507027

Abstract

Abstract: Hydraulic fracturing is an effective measure to improve the caving effect of top-coal in fully mechanized top coal caving face. Through the discussion of hydraulic fracturing mechanism, the crack tip stress intensity factor expressions and crack initiation pressure and shear failure pressure induced by hydraulic fracturing are deduced. Using numerical simulation method to complete the numerical experiments of specimen strength at different water seepage pressure and loading characteristics, the pore pressure evolution and fracture characteristics are obtained, strength deterioration index is proposed to evaluate the degree of hydraulic fracturing. The results show that: the required load for the specimen damage is reduced under the action of pore water pressure; while injection water pressure is less than 3MPa (before rupture time), the load curve has the linear increasing trend, the specimen is destroyed while reaching the peak intensity of specimen, the axial load shows a rapid drop phenomenon. When the pore pressure increases from 0.5MPa to 2MPa, the load to destroy specimen is decreased gradually, and the stress at monitoring line also has this trend. When Pore water pressure is larger, the top of specimen is damaged earlierly. Strength deterioration evaluation index for assessing hydraulic fracturing shows that, with the increase of pore water pressure, the ultimate load and intensity of specimen are decreased gradually, Y (deterioration index) has the trend of exponential increasing, providing the basis for selecting reasonable water pressure.

Key words: hydraulic fracturing, fracture mechanism, strength deterioration, numerical simulation

CLC Number:

TD823.4+9

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URL: http://www.coale.com.cn/EN/10.11799/ce201507027

http://www.coale.com.cn/EN/Y2015/V47/I7/78

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Failure behavior of specimen under the action of pore water pressure and load

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