Design And Research On The Inner Dump Stability Of Weijiamao Open-pit Mine

With the rapid development of the Chinese economy in recent years，the demand for coal resources is growing，so more and more large-scale open-pit mine are born. But with the increase in the number and size of the open-pit mine, more and more scenario of waste dump disaster happen. reasonable slope of open-pit dump can ensure to product safely and sustainably, can also reduce waste of dump footprint.To open pit area is small,and own good economic returns, the final slope angle should be biger and row height should the greater. But this will result in reduced security, and even landslides.Against to Weijiamao open coal unique engineering geology,this paper analysis dump may occur. Weijiamao first Open coal is being mined, but the first mining area will be mined finished after a few years, and then advancing to the northeast. Dump mode of Weijiamao second Open coal will choose the way of Inner dump, namely the establishment of the first mining waste dump in the area.Now we must complete design of the internal dump slope for future production work.First, according to "design specifications Opencast Coal Industry",physical and mechanical properties abandoned row materials, the abandoned material handling methods and types of equipment,we determine that the height of the dump level is20meter; Using Gslope software can calculate the safety factor of dump,and determine that the appropriate slope angle is32degrees; the height of dump is120m, from1080levels to1200levels; also calculate that different ultimate slope angle of slope stability factor Fs, analysis of dump slope stability. Through calculate, determine that the ultimate slope angle is17degrees. Base of the dump for Weijiamao open-pit mine is composed of light gray, the equivalent to the class of homogeneous waste dump slope, which potential landslide mode is circular slip.. I use numerical simulation methods to simulate the dump for the study of the displacement distribution, the stress distribution characteristics and distribution of plastic zone, and reveal that the potential mechanism of dump of Weijiamao open pit-mine.Map of shear strain increases can clearly Show failure mode of slope deformation and failure surface. Because weak rock slope itself, formed plastic flow under the action of gravity itself, dump slope landslide in potential landslide model for circular-arc.Research on this subject designs scientifically.Weijiamao open coal, and to future stability analysis provides a lot of reference value. Therefore, the study of science internal dump slope stability has practical significance.