Study on Failure Mode and Shape Optimization of High and Steep Slope of Open-Pit Limestone Mining Area in Weibei
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摘要: 为了研究渭北石灰岩露天采区高陡边坡破坏模式及形态优化,以渭北宝鸡、咸阳地区作为研究区,通过遥感影像、无人机航拍技术与现场调研相结合,总结了石灰岩高陡边坡特征,分析了其边坡破坏模式和稳定性影响因素,并选取坡度、岩层倾角、台阶数、台阶宽度4个因素进行了正交试验,利用FLAC3D数值模拟软件计算,最终提出了边坡形态优化方案。结果表明:渭北宝鸡、咸阳地区石灰岩高陡边坡变形破坏模式为顺层滑移破坏、楔形体破坏和倾倒破坏;稳定性影响因素为岩性特征、岩体结构和边坡形态;正交试验以尽可能少的试验次数,选出了各因素的最优水平组合;最终提出了坡高为80 m的边坡形态优化参数为坡度65°,台阶数10级,台阶宽度4m,本研究可为高陡岩质边坡破坏模式、边坡形态优化及边坡生态修复研究提供参考。Abstract: In order to study the failure mode and shape optimization of high and steep slope in Weibei open-pit limestone mining area, this paper takes Baoji and Xianyang areas of Weibei as the research areas. Through the collaborative work of remote sensing image, UAV aerial photography technology and field investigation, the characteristics of high and steep limestone slope are summarized, and the failure mode and stability influencing factors of the slope are analyzed. The optimization scheme of slope shape is put forward by using FLAC3D numerical simulation software through the orthogonal test. The results show that the failure modes of high and steep limestone slopes in Baoji and Xianyang areas are bedding sliding failure, wedge failure and toppling failure; the influencing factors of stability are lithology, rock mass structure and slope shape; the optimal combination of each factor was selected using as few orthogonal test as possible. Finally, the optimization parameter of the 80 meters high slope shape is slope 65°; the step number is 10 and the step width is 4m. This study provides references for the study of failure mode, slope shape optimization and ecological restoration of high and steep slope.
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