The study analyzes the characteristics of roof movement in mining top coal of inclined coal seam,and establishes the mechanical model of support and surrounding-rock stability in inclined coal seam.Besides,this study ...The study analyzes the characteristics of roof movement in mining top coal of inclined coal seam,and establishes the mechanical model of support and surrounding-rock stability in inclined coal seam.Besides,this study carries out the numerical calculation and field observation of roof movement and support stability,and provides the critical control measures.The results show that the fracture firstly appears in middle-upper roof and extends upwards in top coal caving in inclined coal seam;regular and irregular caving zones appear in middle-upper stress concentration region,and the asymmetric caving arch is finally formed.Support load of middle-upper working face is larger than that of the middle-lower face;dynamic load coefficient of upper support is large,and the load on the front of support is larger than that on the rear of it,which leads to poor support stability.Stability of support and surrounding-rock system depends mainly on upper-support stability.展开更多
This paper analyses the automatic adjusting of the aim angle because of self-propelledgun’s platform sloping with ground plane caused by self-propelled gun movement, sets up adjustingmethod and model, and presents th...This paper analyses the automatic adjusting of the aim angle because of self-propelledgun’s platform sloping with ground plane caused by self-propelled gun movement, sets up adjustingmethod and model, and presents the corresponding algorithm.展开更多
基金the financial support received from the National Natural Science Foundation of China (No.51174078)Ph.D.Foundation of Henan Polytechnic University (No.60207004) of Chinathe Fostering Foundation of Henan Polytechnic University for the Excellent Ph.D.Dissertation of China (No.508063)
文摘The study analyzes the characteristics of roof movement in mining top coal of inclined coal seam,and establishes the mechanical model of support and surrounding-rock stability in inclined coal seam.Besides,this study carries out the numerical calculation and field observation of roof movement and support stability,and provides the critical control measures.The results show that the fracture firstly appears in middle-upper roof and extends upwards in top coal caving in inclined coal seam;regular and irregular caving zones appear in middle-upper stress concentration region,and the asymmetric caving arch is finally formed.Support load of middle-upper working face is larger than that of the middle-lower face;dynamic load coefficient of upper support is large,and the load on the front of support is larger than that on the rear of it,which leads to poor support stability.Stability of support and surrounding-rock system depends mainly on upper-support stability.
文摘This paper analyses the automatic adjusting of the aim angle because of self-propelledgun’s platform sloping with ground plane caused by self-propelled gun movement, sets up adjustingmethod and model, and presents the corresponding algorithm.
