Application Research On The Flexible Formwork Of Pumped-concrete Support In Gob-side Entry Retaining In Shallow Coal Seam

Shendong mining area is a typical shallow coal seam mining area of our country, Theproven reserves of this area is223.6billion tons, one of the eight coal field of the world.Annual production has more than2billion tons In recent years.The prominent featuresof Shendong coal seam conditions is the shallow buried coal seam (usually within100m), Theoverlying thin bedrock and thick sand layer. Gob-side Entry Retaining is a technology of Coalmining to raise the recovery ratio of resources, reduce the maintenance cost and the amount ofroadway excavation, improve Safety mining and improve the technical and economic benefits.So it is very important to study the Gob-side Entry Retaining in shallow coal seam.This paper using the method of theoretical research, Numerical simulation and industrialtest to study the pressure structure model of shallow coal seam systematically. Usingthe numerical analysis software FLAC to analyze the surrounding rock stress of Gob-sideEntry Retaining in shallow coal seam, And got the mine pressure feature of Gob-side EntryRetaining. And the mine pressure feature has been measured along the construction toSummary the variation law of mine pressure.In this paper, Bearing Beam structure model of Shallow Coal Seam Gob-side EntryRetaining has been got through the study. The calculation method of the model is simple andthe calculation parameters are easy to obtain. it also has universal application. The maximumpressure of roadside support in Yujialiang coal mine43308working face is10.3MPa. Itwas in accordance with Mine pressure observation. According to the observation of minepressure, The activity range of surrounding rock of Gob-side Entry Retaining is between the20meters In front of the working face and60meters behind the working face. The activity ofsurrounding rock is stable at the range of100meters behind the working face.The Flexible formwork and concrete Gob-side Entry Retaining Technology has been applied successfully in Shendong group Yujialiang coal mine43308working face. It is a factthat The Flexible formwork and concrete Gob-side Entry Retaining Technology has beenapplied successfully in the shallow seam.