Research on slope relative stability criterion and its application in open-pit coal mine

doi:10.16265/j.cnki.issn1003-3033.2018.07.013

Abstract

Abstract: The quantity and scale of slope landslide in soft rock open-pit mine is large,and it is difficult to prevent and govern the landslide,aiming at such a problem,the inclined soft rock slope of the southeast in Baiyinhua 1# open-pit mine is taken as the background,on the basis of the theory of limit equilibrium,the geometric shape of slope sliding body is determined,the method of obtaining index parameters of weak layer by back analysis of landslide deformation is given.FLAC^3D is used to reveal stress-strain evolution law and failure mechanism of rock and soil mass of the slope,the criterion of slope relative stability is proposed,the reasonable tracing distance and drawdown position are selected.The results show that: the stability of the slope in the southeast side of the mine increases with the increase of the width of the coal pillar,and decreases with the increase of the tracing distance.When the width of the coal pillar is greater than or equal to 180 m and the tracking distance is within the range of 50-300 m,the southeastern slope can be safely deepened.The width of coal pillar is 180 m and the tracking distance is 50 m,which can maximize the exploitation of resources.

Key words: open-pit coal mine, consequent soft rock slope, drawdown position, tracking distance, stability of slope

CLC Number:

X936

WANG Dong, JIANG Juyu, LIU Shuai, HAN Xinping, CAO Lanzhu, SONG Ziling. Research on slope relative stability criterion and its application in open-pit coal mine[J]. China Safety Science Journal, 2018, 28(7): 76-81.

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