Abstract: To research the overlying strata movement around large mining height fully-mechanized face in steeply inclined thick seam, the field measurement, numerical simulation and similar material simulation methods were used to analyze the strata movement, roof structure and rock-support interaction characteristics in this paper. The results indicate that strata movement of large mining height face is similar to general mining height face in steeply inclined seam, which has asymmetry characteristic along the inclined direction of coal face, but the deformation, failure and movement of surrounding rock is more active, roof weighting step decreases obviously and weighting strength increases, while accompanying with rib fall of coal wall. In addition, the space size of slipping, rolling and filling of caving roof increases, and the anti-dip pile structure is easily formed after the fracturing of main roof, while the filling and compacting degree of failure roof increases at the lower part of coal face, which inducing more significant unbalance mechanics features between the upper and lower part of coal face, and the multilevel ladder strata structure is easily formed in overlying strata above the face. Moreover, the characteristics of contacting and loading of roof-support system is more complex, the change range of support load and interaction between supports increase obviously, while the anti-toppling and anti-skid of coal face equipment is more difficult.

Key words: steeply inclined coal seam；large mining height；strata movement；ladder strata structure；stability of “rock-support&rdquo, system