A Study of the Rib Fall Mechanism in Soft Coal and Its Control at a Fully-Mechanized Top-Coal Caving Face
FANG Xin-qiu
HE Jie
LI Hai-chao
Abstract：The factors involved in rib-fall at a fully-mechanized top-coal caving face in the Wuy-ang mine were analyzed. The mechanical stress characteristics and the mechanism of rib-fall were modeled. Control principles and methods were proposed and a control project, and param-eters for it, was identified. An underground industrial scale test was subsequently completed. The results show that arc shaped "sliding surfaces" exist in the rib. The critical height of sta-ble areas is 1.8 meters. The key to rib stability is the control of this arc shaped surface. Wood-en bolts are used in the serious rib-fall zone to stabilize the rib. After implementation of the new project rib fall depth and scope were reduced significantly and tip-to-face caving was effec-tively controlled.
Keywords：soft coalfully-mechanized top-coal caving facemechanism of the rib fallsliding surface
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 640-644 )