Inversion and zoning characteristics of in-situ stress field in Limin Coal Mine

doi:10.16265/j.cnki.issn1003-3033.2023.S2.0011

Abstract

Abstract:

In order to prevent the deformation and failure of roadway surrounding rock and support caused by stress concentration in the process of mining, it is necessary to clarify the distribution characteristics of in-situ stress in the mine field. According to the regional tectonic analysis and plate tectonic movement situation, the dynamic source and evolution characteristics of the stress field formation in Limin coal mine were revealed. Through the in-situ stress test in the mine field, the principal stress direction and value of the in-situ stress field were determined, and the horizontal tectonic stress field of Limin coal mine was identified with the main advantage. The maximum horizontal principal stress direction was S85.78°W-S89.93°W, and the direction was nearly EW. The roof lithology database and rock stress calculation model of the No.9 coal seam were constructed to invert the distribution characteristics of the maximum principal stress in the mine field, and the tectonic stress zoning of the mine field was carried out according to the stress concentration coefficient. The differences in the stability of roadway surrounding rock in different tectonic stress zones were analyzed. The results show that the surrounding rock in the high stress zone changes the most, and the energy accumulation is the most concentrated. The critical scale of stress concentration in roadway surrounding rock is smaller, and strong mine pressure is more likely to occur.

Key words: in-situ stress, tectonic stress, stress zone, stability of surrounding rock, stress concentration

CLC Number:

X936

DONG Haiqing, LAN Tianwei, YUAN Yongnian, LING Xiangdong, LI Yabin, LI Yang. Inversion and zoning characteristics of in-situ stress field in Limin Coal Mine[J]. China Safety Science Journal, 2023, 33(S2): 105-110.

Figures/Tables 5

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References 20

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测孔	主应力类别	主应力值/ MPa	方位角/ (°)	倾角/ (°)
1号	σ₁	20.60	265.78	-9.94
	σ₂	8.38	-33.08	70.05
	σ₃	4.55	178.88	17.12
2号	σ₁	22.40	269.93	-4.98
	σ₂	9.27	-62.07	84.37
	σ₃	7.06	180.16	2.63

测孔	σ_x	σ_y	σ_z	τ_xy	τ_yz	τ_zx
1号	20.2	4.9	8.4	0.9	1.2	2.1
2号	22.3	7.1	9.4	9.7	0.1	1.1