Abstract:

Hanjiawan Coal Mine of North Shaanxi Mining Co. Ltd. drove open-off cut (old) developing gateways of section 2403 after encountering erosion zone, and then continued excavating forward to clarify the range of the erosion zone. After excavated 25m erosion zone, the seam was found being recovery normal, and drove a new open-off cut nearby recoverable boundary, got about 700 000t coal. Then the problem is resulted, i.e. No. 2403 fully-mechanized coalface how to pass through the old open-off cut. Could fully-mechanized coalface pass directly through the old open-off cut? We take the similar simulation experiment to study the support loading change, abutment pressure distribution and overburden movement by real-time detection in pressure sensors and record value of displacement of measuring points by means of the electronic total station in the period of fully-mechanized coalface passed directly through the old open-off cut. The experiment results shows that the fully-mechanized coal face passes directly through the old open-off cut is feasible after supporting it properly.

Key words: shallow coal seam, fully-mechanized coal face, open-off cut, similar simulation, reinforced support