Abstract
Under the background of ecological civilization construction and comprehensive promotion of "green mine" construction in China, for the waste dump formed by a large amount of abandoned soil and slag in the process of mineral resource production, it is one of the important contents of mine ecological restoration to restore and reconstruct the ecology, especially the slope vegetation. Based on the origin of the dump, when rainfall or irrigation water infiltrates into the soil, the physical and mechanical properties of slope soil are changed, and the shear strength of soil is continuously reduced, which has a negative impact on the slope stability. In this paper, we take south mining of DaTang open-pit mine as an example, through field investigation and sampling, laboratory analysis and the computer software analysis method, we set up soil shear strength parameters under different soil water content and different depth of plant roots, using the Slope stability of Slope/W module, establishing the model of slope . Based on limit equilibrium theory to calculate the safety factor, it is concluded that under the condition of the bare Slope stability of Slope soil water safety threshold is 14%. The root system of slope vegetation plays an important role in slope stability, in which the effect of leguminous vegetation on slope stability is obviously better than that of gramineous vegetation. When the soil moisture of slope is 20%, the slope stability coefficient can be increased by 7%.
Highlights
Under the background of China's ecological civilization construction and promoting the green mines construction comprehensively, we have gradually formed new understanding and new standards for mine restoration, gradually improved and accelerated the pace of controlling
In face of the contradiction between slope safety and ecological benefits, it is of great significance to study the safety threshold of soil moisture on the slope stability of dump to ensure the ecological benefits of slope
Taking the South dump of Datang International Xilinhot open pit as an example, the slope stability of the dump under different soil moisture and vegetation conditions was studied by means of field survey sampling, indoor test analysis and computer software analysis
Summary
Under the background of China's ecological civilization construction and promoting the green mines construction comprehensively, we have gradually formed new understanding and new standards for mine restoration, gradually improved and accelerated the pace of controlling. Especially open-pit coal mining, in the process of production, a large number of waste soil or gangue formed dump which has changed the soil original mechanical composition and structure, resulting in poor water condition, poor soil and low biological activity. Taking the South dump of Datang International Xilinhot open pit as an example, the slope stability of the dump under different soil moisture and vegetation conditions was studied by means of field survey sampling, indoor test analysis and computer software analysis. The shear strength parameters of soil under different soil moisture content and different plant root depth were set up. Combining with the actual soil texture in the study area, the slope stability model of dump slope with different soil moisture content and different plant root depth was established by using slope stability module. Basing on the limit equilibrium theory to calculate the safety factor, to analyze the change rule of slope stability under different plant measures or irrigation or precipitation conditions
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