High Step Dump Safety Control Technology Research

Waste dump footprint in China has reached20000square kilometers with the growing speed of340square kilometers per year, while the national strength can only support6%reclamation rate. In general, the waste dump area accounted for one-third of the entire mining area, and some even up to half. Therefore, to develop high step Dump technology and to develop ultra-high steps Dump is an effective way of significantly reducing the footprint. But as special geological of human engineering activities, ultra-high steps Dump likely to cause geological disasters such as landslides or mudslides.In this thesis, Chifeng copper and molybdenum mine waste dump, for example, Corresponding to particle size grading law during heap row for the high bench Dump, slope angle and stacker, foundation bearing capacity and other factors, based on Geotechnical engineering survey data and field survey experiment, Using the limit equilibrium method, the finite element method and finite difference method to study the dump slope stability state. And then combined with production needs, design the program of the high bench dump heap row. The main contents are as follows:(1) Based on screening analysis of the waste dump heap row materials, established a high bench Dump heap row size distribution law, analyzed the influence of the size distribution characteristics to the dump slope stability, Revealed the main factors affecting the safety of the high level of waste dump.(2) According to engineering geological survey data, the particle size distribution and its impact properties, combined with the waste dump to limit heap theory to determine the limits of the primitive-storey stairs Dump heap.(3)According to the limits of heap height and slope the actual steady state, combined with theoretical analysis and numerical methods, we optimized Dump heap row height and slope angle.(4) By using FLAC-3D to analyze stress field evolution properties of the slope, revealed a heap row of stress change on slope stability, and designed high bench dump.