GENG Shuai, YANG Hang, YANG Jinguang, HE Wei, YIN Aimin. Study on the optimization of skarn type bottom structure support based on the theory of Platts caving[J]. CHINA MINING MAGAZINE, 2022, 31(12): 146-151. DOI: 10.12075/j.issn.1004-4051.2022.12.008
    Citation: GENG Shuai, YANG Hang, YANG Jinguang, HE Wei, YIN Aimin. Study on the optimization of skarn type bottom structure support based on the theory of Platts caving[J]. CHINA MINING MAGAZINE, 2022, 31(12): 146-151. DOI: 10.12075/j.issn.1004-4051.2022.12.008

    Study on the optimization of skarn type bottom structure support based on the theory of Platts caving

    • In view of the supporting difficulties of complex broken and large water skarn bottom structure of an iron mine, such as support difficulties such as the development of joints and fissures, low rock strength and easy expansion in case of water, the existing bolt-net shotcrete support method is not ideal, and the optimization of supporting parameters is carried out.Firstly, the physical and chemical properties of skarn rock mass are determined according to laboratory expansibility tests.Secondly, the reasonable supporting parameters of skarn bottom structure were determined by theoretical calculation and numerical simulation based on the theory of caving arch as the roadway supporting principle.Finally, the reasonable supporting parameters of skarn bottom structure were determined by on-site monitoring analysis.The experimental results show that the clay minerals in skarn are easy to expand in water, and the expansion rate reaches 85.06% after 20 h of water absorption.The numerical simulation results show that the deformation of roadway decreases significantly with the addition of prestressed anchor cables.According to the field monitoring results of roadway convergence for 30 days, the cumulative displacement of roof, floor and left and right sides is only 52 mm and 39 mm.It indicates that the skarn roadway should be quickly closed by shotcrete process after excavation.The combined support technology of shotcrete+bolt+prestressed anchor cable can effectively solve the problem of surrounding rock stability control of tunnel with bottom structure in an iron mine, and can guarantee the mining approach during the term of use basic stability and orebody safe and efficient mining and main wear vein of long-term stability.

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