Abstract
Chengmenshan copper mine, located at Jiujiang city in the Jiangxi Province, is a rarely lakeside open-pit mine in China. Since the open-pit is very close to Sai Lake, the seasonally changed water level and the distance between lake and slope have great influence to the stability of open-pit slope. Based on the drill data and geological sections, a numerical model of the slope is built. With the fluid-mechanical interaction associated, the stability of the slopes is numerically analyzed, in which different lake water levels and lake-slope distances are taken into consideration. The comparative analysis shows that a larger lake-slope distance can promise better slope stability and weaken the sensitivity of slope stability to water. The stability of slopes with different heights is analyzed to find that the stability weakens and the sensitivity is enhanced with the height increasing. To the most serious situation, the slope height and the lake water level being 238 m and 17.2 m, respectively, theFsvalue equals 1.18945 which is extremely closed to the allowable safety factor of 1.20 for slope design. According to the minimumFsfor slope design, the minimum distance between lake and open-pit slope is found to be 60 m.
Highlights
According to a large number of engineering practices, landslides of natural and artificial slopes often happen after the heavy rain or continuous rainfall
Based on the drill data and geological sections of exploration line, a 3-dimensional geological model of the lakeside openpit slope is established by DIMINE
The seasonally changed water level of Sai Lake and the distance between lake and open-pit slope have been considered in the numerical analysis
Summary
According to a large number of engineering practices, landslides of natural and artificial slopes often happen after the heavy rain or continuous rainfall. A lot of studies have been done to learn the coupling mechanism of water pressure and rock mass stress [6,7,8,9,10,11,12]. The deformation of pit slope, which is largely inelastic with creep and slip on structures, causes irreversible changes in the rock mass and hydraulic properties of the mass and is largely indirect coupling. The mathematical model was used to analyze the stability of coal mining open-pit slope, and the result indicated that the reduction of effective stress caused the failure of the slope. Numerical modeling is an efficient method in the analysis of slope stability under the action of seepage. The open-pit slope stability is assessed numerically by FLAC3D associated with the lake water. Comparing the safety factors of slope under different heights of water level, a reasonable distance between lake and open-pit slope is determined
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