Abstract: Aiming to study on strata-pressure behavior and analysis adaptability of support at Sheng-xin Mine 51101 fully mechanized face in shallow seam under soft roof, we derived the theoretical value of the first weighting interval and the periodic weighting interval and analyzed the formation and stability of the “short block voussoir beam” and obtained that the “short block voussoir beam” structure instability is key reason to drastic strata-pressure behavior. We obtained data of the support and the degree of side fall roof by arranging stations at the 8th, 36th, 92nd, and 120th. The data analysis results show that the first weighting interval of roof is 30.16m and the periodic weighting interval is 10.72m, which are accord with the theoretical value. During the roof weighting the powered supports would have high working resistance at the middle and upper part of the coal mining face and the supports located in the rest area have low working resistance. Besides, the necessary supporting strength of 51101 fully-mechanized face is 0.74MPa, the supporting strength of ZYG10800/19/38D type hydraulic powered support is 1.097~1.26MPa, which could meet the requirements of fully mechanized face with the soft-weak roof.

Key words: shallow seam, short block voussoir beam, strata behavior, supporting strength