Technical manage for movable support top-coal drawing face;

Affected by the geological conditions,the impact of 11121 face caving coal seam during mining can not be taken until the gradual thinning to take forward during the pre-mining-oriented will be removed and replaced movable support for the π-shaped Steel Beam with single hydraulic props supporting the methods to ensure normal production of the mine production plan and to succeed.

Xieyi Coal Mine used the roof caving technology of cantilever support to realize high effective and safe production,which obtianed good effect.

The cantilever support mining was successfully applied at No.

Experimental study of support technology of combined suspension support with whole roof beam;

Based on the observation data,the main load-bearing characteristics of hanging-sliding supports in a sublevel caving face are studied,and the adaptability of the supports is analyzed.

Based on the condition of seam occurrence of Caozhang Coal Mine,the feasibility of sublevel-caving mining with hanging-sliding support under the thick alluvial aquiferare studied in this paper on three aspects:the sublevel-caving support selection,the sufficienty condition of sublevel-caving mining and technic-economic benefits,and soon.

Developing and applying the hydraulic joint and moving support;

This paper introduces the application of ZHZ 1600/16/24-type combined suspension frame top-coal blasting and mining technique in Gushuyuan Coal Mine,points out some problems existing in this technique and some measures that should be adopted,and illustrates the coal recovery ratio and economic benefits after adopting this new technique.