Determination and application of support parameters powered hydraulic crawler walking powered support in thin seam

In order to solve coal mining recovery rate and production efficiency of thin seam with thickness of 1.0 ~ 2. 0 m and to eliminate hidden danger of large area suspended seam roof, ZX7000 /12 /22 type narrow crawler walking hydraulic powered support was researched and developed to provide safety support of the gate way and to provide roof cutting force of the time roof falling in goaf. The paper introduced shortwall mechanized double wing mining technology of thin seam and analyz ed interaction between the walking powered support and the surrounding rock in the thin seam. An auxiliary area theory was applied to determine the support parameter of the walking powered support in the thin seam and introduced the performance features of the powered support. A 3D numerical simulation and industrial experiment a nalysis were applied to analyze stress field, plastic zone and roof subsidence value of the shortwall coal mining face as well as the support conduction of the walking powered support. The results showed that after the walking powered support applied to support roof, a stress concentration coefficient of the residual coal pillar was 1. 7 ~ 2. 0. At this moment, the plastic zone scope of the coal pillar was small, could maintain the stability of the roof and could have sufficient roof cutting capacity. The i mmediate roof fell with the mining operation could prevent a formation of large area roof suspended. Thus the month production of the coal mining face could be 50 000 ~ 60 000 t and the coal mining recovery rate was over 80%.