Abstract: Based on the rock beam transmission theory and the key strata theory， the stress distribution characteristics in front of the fully-mechanized mining face were analyzed， and a warping beam structure composed by the main roof covering the mining face and the support pressure area in front of the fully-mechanized mining face was proposed. A mechanical analysis model of the warping beam structure was built to deduce the quantitative formula of the supporting area before the first weighting. The FLAC numerical simulation was used to obtain the transfer coefficient of elastic damage. The SW4102 mining face of Xiaonan coal mine was adopted as a real case to study the ranges of the warped stress zone and the support pressure zone， and results was verified by the in-situ monitoring data.

Key words: warped beam structure, warped stress zone, support pressure zone, transfer coefficient of elastic damage, FLAC numerical simulation