Instant Removal Gateway for Large Height Working Face in Soft Coal Seam

In view of disadvantages such as complex fault structure during the late mining, the holing-through difficulty of pre-excavation removal gateway and great difficulty of roof control, it is determined to adopt instant equipment removal gateway scheme. With measurement analysis of overlying strata movement characteristics during the late mining, the reasonable stop mining location is established. Theoretical analysis and computer simulation are used to develop a plan for withdraw support scheme. Comparing with the pre-excavation removal gateway, the instant gateway shortens construction period of about 14 days, saves 262 labors, and its outline is regular with small deformation without secondary maintenance.