Interactions of overburden failure zones due to multiple-seam mining using longwall caving

摘要: This paper presents an investigation on the interactions of overburden failure zones induced by mining adjacent coal seams using longwall caving method. Overburden is important factor in safety assessments fields engineering geology and geology, especially when under water bodies. In this study, influence thickness properties interburden between development fractured flow are investigated situ measurements, scale model testing numerical simulations. The height tests simulations basically good agreement with measurements after upper lower Seam No. 3 Cuizhuang Coalmine. Therefore, study verified. results show that interaction superposition two close distance cannot be ignored ratio (h/M) (h) to cutting seam (M) less than a defined critical value. A dividing line, Line D, has been proposed judge whether exist. When (M, h/M) points located above zone excavation will not propagate seam. Otherwise, for below must considered predicting heights zones.