Alpine Region Open Pit Slope Stability Analysis And Structure Parameter Optimization Research

With the growth of mining economy, China’s mining engineering construction in alpine-cold region has got gre at development. Mining’s Construction scale and the increase of complexity brings complex engineering geological and geotechnical engineering problems. Temperature change has a significant impact on the stability of slope which contained large water in permafrost regions.Knowing the impact that the freezing-thawing hazard in alpine-cold region had on slope stability so that we could reduce this impact in the process of engineering design and production is an important research content of reasonable developm ent of mineral resources in alpine-cold region.Mongolian Aobao zinc is an open-pit mines which seat in the alpine-cold region. Due to the effect of bad engineering geological conditions of slope 、unreasonable slope structure parameters 、 freezing-thawing hazard together with blasting vibration,slope collapsed,slope landslide at local area,which seriously affected the mine production safety and economic benefits. In order to eliminate the potential safety risk of mine production, to ensure the safety of the mine production and economic benefits. Considering with the actual situation of Aobao zinc, we carried out slope stability analysis and the structural parameters optimization research in the alpine-cold region through the method of field investigation 、 laboratory test、 the theoretical analysis combining with numerical simulation, The main research contents and results are as follows:(1) Carried out the mine engineering geological survey with the methods of SIROVISION three-dimensional digital photogrammetry a nd rock mass structure analysis system, conducted indoor rock mechanics test on skarn 、marble and granite and so on six kinds of lithologic that ma de up the slope, carried out quality evaluation on the slope engineering rock mass with the method of RMR, CSMR classification. On this basis, we conducted the engineering geological division on the slope, analyzed the failure mode of the slope’s each section.(2) Established the slope stability calculation model under the freeze-thaw environment and the more field coupling condition, analyzed the rock mass’ s characteristics of the internal temperature gradient change in the ambient temperature, respectively when slope at the temperature of- 10 ℃,-20 ℃, and-30 ℃, determined the freeze-thaw boundary location. We studied the slope’s the variation of stress and the change rule of frost heave at different environmental temperature under the condition of gravity field, temperature field and their co upling.(3) Obtained mechanical parameters with the method of RMR rock mass classification, HOEK BROWN failure criterion of lattice, and the algorithm. Considered comprehensively the rock mass made up with the slope, engineering geological conditions and f actors such as height and shape of the slope, took use of the results of slope rock mass indoor test and field test,analyzed the designed mining slope stability under different working conditions with method of the limit equilibrium and finite element strength subtraction.(4) On the basis of the slope stability analysis and the research of the influence law of the freeze-thaw environment, I conducted contrastive analysis on parameter optimization scheme of the designed mining slope, analyzed integrately of the whole slope stability, considered the slo pe rockfall hazard mitigation requirements caused by freeze-thaw environment,determined safe 、 reliable 、 economic and reasonable slope parameters optimization scheme.