Application of Connected Long Bolt Support in High Cutting and Narrow Coal Pillar Gateway of Deep Mine. (English)

In order to solve a deep broken depth of the sidewall along the gateway with hlgh cutting narrow coal pilar in deep mine and a low extension rate of an anchor, a connected long bolt applied to the roof support of the gateway was provided to replace the anchor and a rigid long thread bar connected bolt applied to the gateway sidewall was provided to replace the short bolt support technology. Based on the site measurement and the FLAC 3D numerical simulation, a connected long bolt support plan was set up, the bolt support parameters were optimized and a site comparison experiment was conducted. The results showed that there was a high relationship between the anchor support effect and roof subsidence value. Due to the high support strength of the anchor, when the roof subsidence value was not over the extension value of the anchor, many anchors were broken and failure occurred and the connected long bolt with no broken phenomenon occurred had good support function. The rigid long thread bar connected bolt support would well control the convergence value between the two side-walls during the mining and excavation period and could reduce the deformation and stability time of the two sidewalls. [ABSTRACT FROM AUTHOR]

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