| In this paper,the stability of the ultra-high dumping site of a mine is taken as the main research objective,and the distribution of the granularity of the dumping site is obtained through on-site investigation and analysis of the ultra-high dumping site;The field steps are divided into four layers:the upper part,the middle part,the lower part and the bottom part.The granularity ratios of the granular materials in the different height layers of the dumping site are further passed through the indoor direct shear test to obtain the physical and mechanical properties of the various layers.It is known that the measurement theory constructs a landslide risk assessment model for ultra-high dumping sites to evaluate the dumping site,and calculates the stability of the dumping site under different rainfall conditions,and stratifies the steps and discharges the soil under non-stratified conditions.The field stability was compared;both evaluations and calculations showed that the dump site was highly risky when the rainfall exceeded the maximum daily rainfall(130 mm/d),and then three optimization schemes were proposed to reduce the stage height,and the optimal solution was compared and analyzed.Summing up the research content of this article,the conclusions obtained mainly include the following points:(1)The particle size composition of the slope surface of the dump soil The regression coefficients of the Rosin-Rammler function parameters n and d fitting functions are all greater than 0.9,and the correlation degree is high,which is in good agreement with the Rosin-Rammler function.The higher the level of soil discharge in the dump,the more obvious the grading characteristics of the distribution of the scattered bodies.(2)Combining review related literature with existing research results to construct a landslide risk assessment model for ultra-high dumping land based on unascertained measurement theory.The unascertained measure function of each index was constructed and the evaluation matrix of each index of the dump was calculated.The least square method and entropy method are used to obtain the subjective and objective weights of each impact index of the dump,and a combination weighting optimization model constructed based on game theory is used to obtain combined weights and multiple indexes for each index in rainy and dry periods.The evaluation vector shows that the landslide risk grade is Grade IV in the rainy season,and the possibility of landslide caused by rainfall action is very high;the risk grade of landslide in the dilute rain period is Grade II,and landslide is generally possible.(3)Using Geo-Studio software to calculate the stability of waste dumps under different rainfall conditions,it can be seen that the step stratification of the dump is much higher than that of the step without stratification;the dump is in the absence of rainfall.In a stable state,in the case of a rainfall exceeding 130 mm/d,the ultra-high step waste dump in the western region is most likely to produce landslides under the influence of heavy rainfall.This is consistent with the results obtained from the assessment of landslide risk assessment model established in Chapter 3.(4)Landslide risk assessment and numerical calculations all indicate that the dump site is likely to induce landslides under strong rainfall(above 130 mm/d).Therefore,three optimized soil-reducing projects are proposed.The safety factors of the ultra-high dumping sites under the same rainfall conditions,under the same rainfall conditions,under the same rainfall conditions are represented in Scheme 2>Scheme 1>Scheme 3 in the eastern region.The western slope is scheme 2>scheme 3>scheme 2,the stability of the super-high dump is the best in the scheme 2.The stability of the super-high dump first increases and then decreases as the height of the bottom terrace decreases. |
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