龙南县足洞地区滑坡危险性评价及防治对策研究

发布时间：2019-06-02 14:12

【摘要】：赣南稀土矿山资源丰富,资源具有配分全、有价元素含量高、矿体埋藏浅、原矿放射性比度低等特点,探明储量居全国之首。近几十年来,人们对稀土无序的开采引发了大规模的滑坡灾害,开采过程中人员及设备的安全严重受到威胁,因此,对稀土矿山滑坡危险性评价及防治研究对维护人民群众的生命财产安全具有重要意义。论文结合对研究区展开的调查分析,通过ARCGIS软件建立数字高程模型,运用层次分析法计算权重,并结合加权信息量模型对研究区进行滑坡危险性区划,确定高危险等级区域,分析高危区影响因素并利用geostudio软件模拟特定条件下边坡稳定性系数的变化,提出滑坡防治建议,主要结论如下:1.结合野外实际调查资料与遥感影像对研究区滑坡影响因素进行分析,为研究区滑坡危险性评价因子选取提供依据。2.根据研究区工程地质条件,选取坡度、坡向、高程、原地浸矿区、池浸堆浸区、居民区与未扰动坡体作为评价因子,选用层次分析法与加权信息量模型并运用arcgis空间分析功能进行滑坡危险性分区,将研究区危险等级分为高、中、低三类,其中高危险区占总面积的15.24%,中危险区占41.49%,低危险区占43.27%。3.针对滑坡高危险区,分析各要素引发滑坡的机理,结合实际工艺流程,运用geostudio软件辅助分析,提出滑坡预防建议。4.针对尾砂堆,选取生态恢复的防治措施;针对采用原地浸矿工艺后的坡体,其边坡稳定性较浸矿前有所降低;针对正在采用原地浸矿工艺的坡体,发现边坡稳定性系数随浸矿时间的增加,在持续注液33天左右达到最低值;通过改变持续注液速率发现当注液速率小于13.26mm/d时边坡稳定性系数在安全标准值以上,建议结合原地浸矿工艺流程,选择控制注液速率以降低滑坡发生概率。
[Abstract]:The rare earth mines in southern Jiangxi are rich in resources, with the characteristics of complete distribution, high content of valuable elements, shallow buried orebodies and low radioactivity ratio of raw ores. The proved reserves rank first in the country. In recent decades, the disorderly mining of rare earth has triggered a large-scale landslide disaster, and the safety of personnel and equipment in the mining process has been seriously threatened. Therefore, The study on landslide risk assessment and prevention in rare earth mines is of great significance to maintain the safety of people's lives and property. Based on the investigation and analysis of the study area, the digital elevation model is established by ARCGIS software, the weight is calculated by analytic hierarchy process (AHP), and the landslide risk zoning of the study area is carried out with the weighted information model, and the high risk grade area is determined. This paper analyzes the influencing factors of high risk area and simulates the change of slope stability coefficient under specific conditions by using geostudio software, and puts forward some suggestions for landslide prevention and control. The main conclusions are as follows: 1. Combined with the actual field investigation data and remote sensing images, the influencing factors of landslide in the study area are analyzed, which provides the basis for the selection of landslide risk assessment factors in the study area. 2. According to the engineering geological conditions of the study area, the slope, slope direction, elevation, in situ leaching area, pool leaching heap leaching area, residential area and undisturbed slope are selected as the evaluation factors. The analytic hierarchy process (AHP) and weighted information model are selected and arcgis spatial analysis function is used to divide the landslide risk into three categories: high, medium and low, in which the high risk area accounts for 15.24% of the total area. 41.49% in the middle risk area and 43.27% in the low risk area. In view of the high risk area of landslide, this paper analyzes the mechanism of landslide caused by each factor, combined with the actual technological process, and uses geostudio software to assist the analysis, and puts forward some suggestions for landslide prevention. 4. For tailings pile, the prevention and control measures of ecological restoration are selected, and the slope stability of the slope body after in-situ leaching technology is lower than that before leaching. For the slope body which is using in-situ leaching technology, it is found that with the increase of leaching time, the stability coefficient of the slope reaches the lowest value in about 33 days of continuous liquid injection. By changing the continuous liquid injection rate, it is found that the slope stability coefficient is above the safety standard value when the liquid injection rate is less than 13.26mm/d. It is suggested that combined with the in-situ leaching process, the liquid injection rate should be controlled to reduce the occurrence probability of landslide.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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