Visualization analysis and prospect of current research situation in field of coal mining subsidence in China

Research purpose is to clarify the spatial-temporal distribution of related research on coal mining subsidence areas,research hotspots,frontiers and development paths of its knowledge networks. Research process and method were discussed that used bibliometrics to achieve visualization analysis and knowledge map from the annual publishing trend,cooperative analysis of institutions and authors,publishing journals,keywords co-occurrence analysis and burst terms detection,etc. Study subjects were 1 371 papers collected from 1992 to 2018 in CNKI. And future research was prospected. Results showed:① Number of papers published in the field of mining subsidence in China has experienced the steady start exploration,accelerated development and stable development. ② Research institutions are mainly consisted of universities,laboratories and scientific research institutes,and strength of universities is dominated by China University of Mining and Technology,China University of Mining and Technology (Beijing) and Anhui University of Technology. A scientific research cooperation circle of "university-enterprise-research institute" has been formed. And the journals with great influence are selected. ③ Based on the co-occurrence analysis of keywords,the research hotspots of "mining subsidence area,reclamation and comprehensive treatment" are identified,and 14 clusters of mining subsidence land,landscape process and comprehensive treatment are formed. ④ The research frontier is divided into three stages by using the outburst detection and analysis of keyword co-occurrence analysis results,namely,the research start and steady development stage in 1992—2008,the stable operation development deepening stage in 2009—2013,and the stable development stage of the brewing and deepening of the previous research content in 2014—2018. Conclusion is that the formulation and implementation of comprehensive management and ecological restoration policies for coal mining subsidence areas,the basic investigation of the situation of coal mining subsidence areas,the key technical systems,mechanism planning and standards of comprehensive management and ecological restoration will become the future research focus.