非等压应力场上向长距离穿层瓦斯抽采钻孔密封长度研究

doi:10.13722/j.cnki.jrme.2017.1014

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Abstract

In the gas drainage of coal mines，it is difficult to seal boreholes and determine the sealing length of upward long crossing boreholes under biaxial unequal stress fields. To solve the problem，No.6 mine of Pingdingshan coal group was taken as the engineering example. On the basis of elastic-plastic theories and Mohr-Coulomb criterion，the boundary equations of plastic zones in the surrounding rocks of the circular roadway under unequal stress fields were deduced. The theoretical analysis results were then verified by numerical simulation(FLAC^3D). It was concluded that the boundary shape of plastic zones in surrounding rocks was not circular but symmetrical butterfly-shaped form under equal stress fields，when the lateral pressure coefficient was not equal to 1. The stress of surrounding rocks was distributed unevenly and its gradient changed significantly. Moreover，the obvious difference was observed on the scope of stress-relaxed areas of surrounding rocks with different angles. The deviation of plastic-zone depth calculated by theory and numerical simulation was lower than 5%. The reasonable sealing length of boreholes was determined finally considering the change laws of plastic zones. In addition，a new sealing technology was proposed aiming at sealing upward boreholes. The field test results show that the negative pressure of gas drainage in boreholes is more than 13 kPa，and the maximum concentration of gas drainage is 1.4 times that of testing boreholes under equal stress fields. Furthermore，the concentration of gas drainage decays slowly. The test effect can meet the need of long-term and high-efficient gas drainage.

Key words： mining engineering unequal stress field upward borehole for gas drainage sealing length boundary equation of plastic zone step-by-step sealing technology

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	Articles by authors
	ZHANG Guang1
	WU Jingang1
	2
	YANG Longjie3

Cite this article:

ZHANG Guang1,WU Jingang1,2, et al. Determination of the sealing length of upward long crossing boreholes for gas drainage under unequal stress fields[J]. , 2018, 37(S1): 3422-3431.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1014 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3422

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