Structural plane characteristics and stability of broken surrounding rocks

doi:10.16265/j.cnki.issn1003-3033.2019.09.022

China Safety Science Journal ›› 2019, Vol. 29 ›› Issue (9): 138-143.doi: 10.16265/j.cnki.issn1003-3033.2019.09.022

• Safety Science of Engineering and Technology • Previous Articles Next Articles

Structural plane characteristics and stability of broken surrounding rocks

ZHAO Kang^1,2, WANG Qing², WANG Junqiang¹, SUO Tianyuan¹, HAO Jiaolong¹, LIU Xiaosheng³

1 Lingbao Jinyuan Mining Company Limited, Lingbao Henan 472500, China;
2 School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China;
3 Changsha Institute of Mining Research Limited Company, Changsha Hunan 410012, China

Received:2019-05-12 Revised:2019-07-15 Online:2019-09-28 Published:2020-10-30

Abstract

Abstract: In order to evaluate the stability of extremely fractured surrounding rocks in a gold mine, micro-fracture structural planes of the IV and V grade of the surrounding rocks in the mine were measured and analyzed in three production sections of +260, +295 and +330 m. The influences of joint spacing, occurrence, undulating shape, roughness, openness and seepage on surrounding rock stability were analyzed by scanline method. The distribution characteristics of dominant structural planes occurrence were discussed by using pole plot and rose plot. The results show that the surrounding rock joints are well developed and closely distributed, and the average spacing is less than 1m and is mainly concentrated in 0.2-0.6 m. The surrounding rocks are broken and extremely broken rock mass with poor stability. The dominant occurrence has obvious concentration in the middle of +260, +295 and +330 m. The dip is mainly concentrated at 324-360 ° and 0-35 °, and the dip direction is mainly concentrated at 70-79 °. The undulating state of the structural plane is mostly straight, which has a great influence on the stability of the structural plane. The structural surfaces are tightly combined with less filler, which has less influence on the structural surface stability.

Key words: broken surrounding rocks, surrounding rock stability, structural plane characteristics, joint crack, scanline method

CLC Number:

X935

ZHAO Kang, WANG Qing, WANG Junqiang, SUO Tianyuan, HAO Jiaolong, LIU Xiaosheng. Structural plane characteristics and stability of broken surrounding rocks[J]. China Safety Science Journal, 2019, 29(9): 138-143.

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Structural plane characteristics and stability of broken surrounding rocks

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