Abstract

In order to monitor mechanical behaviors of weak rock and coal surrounding gates of fully mechanized top-coal caving (FMTC) face and provide guidance for gate layout, supporting design and safe mining, experimental analysis including lab and spot testing are put forward by analyzing deep displacement, surface displacement, stress redistribution and supports loading. The results show that rock surrounding gateways lies in abutment pressure decrease zone near working face, support loads decreasing, but both supports and surrounding rock deformation are the most acute. The deformation of surrounding rock mainly appears in abutment pressure influence zone. Reasonable roadway supporting should control the deformation of surrounding rock in intense stage of mining influence. Consequently rock pressure and behaviors of weak rock in FMTC are lower occurrence in thick seam mining and supporting design ideas of tailgate and maingate should be changed from loading control to deformation control.

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