Based on the study of the top coal movement of top coal caving faces and the analysis of the producing and developing of top coal fractures, top coal can be divided into different regions on the basis of fracture character with on the spot bearing pressure curve, top coal movement curve and movement rate curve.

Study and development of software used for mesurement and analysis of submental vertex radiograph;

Design based on top displacement of confined boundary zones in a tall shear wall structure

With the help of the software ANSYS,this article calculated shear wall top displacement under different transverse load,thus calculated shear wall equivalent stiffness under the conditions of the corresponding load in accordance with design requirements,providing a new way for calculation of equivalent stiffness of the open-cross shear wall.