Abstract: Aiming at the existing problems in D mining area of Jinchanghe Lead-zinc Mine,which included excessive consumption in main mining area,low grade of lead and zinc,amount of excavation work,difficulty in filling and the high cost, the mechanical model of plate and shell structure was established by applying the theory of elasticity to reveal two caving stages,analyse the initial falling height of goaf roof of 11~ 38 m,26~ 58 m and 41~ 87 m under different schemes,and calculate the following stable caving height reaching 1. 5~ 2. 0 times the span of goaf. At the same time,according to the stope parameters and the characteristics of loose body,it was analyzed that the falling arch floor can be naturally squeezed when falling 67~ 100 m. In order to prevent the surface dislocation collapse,it was proposed to squeeze the temporary pillars by waste rock filling in time strengthening the pillar support capacity and limiting the caving of the large area. Based on this,different mining schemes of open stope method,pillar retaining open stope method and open stope timely filling were designed. Through the comparison of initial caving height of goaf roof,pillar bearing value and recovered ore volume,the open stope timely filling scheme was recommended to ensure the safety of D mining area.

Key words: gently inclined thick orebody,plate and shell theory,caving law,goaf roof,stability analysis