Research on stability of goaf roof under mechanical construction loading

doi:10.16265/j.cnki.issn1003-3033.2017.07.024

Abstract

Abstract: To ensure the safety of the operation personnel and the mining and excavation equipment at the place over the goaf, based on the mechanical analysis, the rock beam of shallow goaf was generalized as a mechanical structure model like clamped-clamped beam, a total potential energy equation was established for the system of ground mechanical construction loading and goaf roof. Based on the catastrophe theory, a cusp catastrophe model was built for instability of goaf roof, a criterion was obtained for catastrophic instability of goaf roof , and then a calculation model was built for mechanical construction loading under the condition of maintaining the goafroof. As well, example verification of the calculation model was carried out. The results show that the larger the lateral thrust force acting on goaf roof rock beam is, the smaller the elastic modulus of rock beam is and the greater the span of the goaf is,the greater the probability of losing stability for the goaf roof will be,that the necessary condition for the instability of goaf roof is related to the internal characteristics of roof, which has nothing to do with external conditions,and that the necessary and sufficient condition for the instability of goaf roof under ground construction loading depends on the combination of internal characteristics of roof and external conditions.

Key words: catastrophe theory, ground loading, shallow goaf, roof rock beam, potential energy equation, instability criterion, stability

CLC Number:

X936

LI Yufei, YE Yicheng, LIU Xiaoyun, HU Nanyan, LUO Binyu, YUAN Zhouhao. Research on stability of goaf roof under mechanical construction loading[J]. China Safety Science Journal, 2017, 27(7): 133-138.

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