Research on the size of coal pillar in thick top coal roadway and the support technology of"roof controlling and side limiting"
In order to study the size of coal pillar and support problems during the reduction of cutter bar face in the presence of geological structure,combining with the geological conditions of No.1310 Face in Dongtan Mine,Through theoretical analysis and numerical simulation,the size of coal pillar of knife handle type face after the reduction of face was determined,and put forward the principle of"roof controlling and side limiting"support to realize the synergistic control of deep and shallow surrounding rocks of thick top coal roadway and realize the synergistic control of deep and shallow surrounding rocks of thick top coal roadway.The principle of"roof controlling and side limiting"support was proposed to realize the synergistic control of the deep and shallow surrounding rocks in the roadway with thick top coal.The research results showed that leaving 40m protective coal pillar,together with the support program,could fully ensure the safety and stability of No.1310 trackway.Combined with the monitoring situation on site after face reduction,it was considered that the width of 40 m coal pillar after face reduction and the support program were reasonable and feasible.
knife handle typeelastic corelimit equilibrium theoryplastic zone
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