A Geometric Computational Model for Calculation of Longwall Face Effect on Gate Roadways

作者：Mohammadi Hamid^*; Farsangi Mohammad Ali Ebrahimi; Jalalifar Hossein; Ahmadi Ali Reza

来源：Rock Mechanics and Rock Engineering, 2016, 49(1): 303-314.

DOI：10.1007/s00603-015-0739-5

• Gate roadway
• Excavation-damaged zone (EDZ)
• Longwall face
• Caving zone (CZ)
• Geometric computational model (GCM)

In this paper a geometric computational model (GCM) has been developed for calculating the effect of longwall face on the extension of excavation-damaged zone (EDZ) above the gate roadways (main and tail gates), considering the advance longwall mining method. In this model, the stability of gate roadways are investigated based on loading effects due to EDZ and caving zone (CZ) above the longwall face, which can extend the EDZ size. The structure of GCM depends on four important factors: (1) geomechanical properties of hanging wall, (2) dip and thickness of coal seam, (3) CZ characteristics, and (4) pillar width. The investigations demonstrated that the extension of EDZ is a function of pillar width. Considering the effect of pillar width, new mathematical relationships were presented to calculate the face influence coefficient and characteristics of extended EDZ. Furthermore, taking GCM into account, a computational algorithm for stability analysis of gate roadways was suggested. Validation was carried out through instrumentation and monitoring results of a longwall face at Parvade-2 coal mine in Tabas, Iran, demonstrating good agreement between the new model and measured results. Finally, a sensitivity analysis was carried out on the effect of pillar width, bearing capacity of support system and coal seam dip.

• 出版日期2016-1