A Dynamic Response Evaluation Of Landslide By AMD Corrosion And Control Methods

There are a lot of sulfide mine mining in China. Chemical mines mines sulfide ore,mainly chemical composition of non-ferrous metal ore body are sulfide, southern coaldeposits also contain a large number of sulfide. AMD (Acid Mine Drainage) etching tosulfide ore is for the special mechanical behavior of destruction on mine slope, whichdamages the slope. Significantly investigation shows that, the frequency and scale of the minelandslide was significantly higher than that of the general mines. Therefore, to carry out thecorrosion mechanics of landslide disaster response assessment and control for AMD, is ofgreat significance for reducing the induced engineering disasters.Aiming at the problem above, this paper takes the critical regions in open-pit slope of ansulfide mine as research subject, determine the AMD damage threshold by analysis andmeasure on the mechanical properties of sensitive rock mass slope, load capacity from theaspects of erosion experiments, theoretical of acid deposition, dynamic response ofsimulation, then, establishment the system critical load of corrosion. At the same time, putforward the prevention measures according to the key regional dynamic response forsimulation. Papers focus on assessment for AMD erosion disaster response and control, thedone work can be list as follows:(1) Based on the corrosion damage theory about AMD, and analyze the critical damageabout rocks is0.125, considering the damage, the critical state factor of safety of theslope.critical is1.1. Accoding to the mine corrosion process, establishs system quantitativeand qualitative index respectively in AMD acidification characteristics, rock damage, slopestability.(2) Based on the corrosion indexs, apply micro-chemical to analyse the dynamic erosionprocess, establishes the numerical model for slope acidification. Through the detection of oreacid neutralizing capacity ANC and acid producing ability of NAG, explains the failuremechanism about rock. After12weeks of leAChing test, pH tends to7by end, explaining theacid degree change and rock body the dynamic characteristics of damage under corrision.(3) Inhibition effect on slope stability by distance discriminant analysis based on thestatistical principle, establishs the eroded slope dynamic safety assessment criterion. Theslope erosion reflects mechanical strength reduction, to determine the stability of slopechange by12feature points in the key position, then explains the corrosion process for themacro change of slope stability. Study found limonitization diorite Bin Yan, brown iron ore(HFe) loose body in the slop is the most sensitive by AMD corrosion, for which will occurr landslides at the first, and the landslide area increases with erosion time prolonging.(4) By using the pretreatment of ANSYS, establishes the FLAC3danalysis model inaccordance with the actual situation of mining, creats models for different working condition,and analyses the stress and deformation characteristics under equilibrium state. Results showthat, AMD corrosion influences regional extended during seepage, blasting the landslide, andthe maximum stress increases significantly, which induces slope landslide sharply. Based onresearch results, establishs perfect control measures to prevent the slpoe from landslide bycorrosion.