摘要
露天煤矿内排土场的软弱基底是影响内排土场边坡稳定性的关键因素,为了提高内排土场边坡稳定性,基于二维刚体极限平衡法和数值模拟方法,对内排土场软弱基底进行分段处理,分析了15种不同处理方案的边坡稳定性。结果表明:基底分段处理位置对边坡稳定性的影响显著,基底处理位置越靠近到界边坡坡脚,边坡稳定性越高;随基底处理长度增加,边坡稳定系数逐渐增大,呈对数函数关系;以Fs/n为评价指标,确定了经济合理的基底处理方案,进而提出了一种顺倾软弱基底的分段优化处理方法。数值模拟结果揭示了基底处理后边坡变形破坏机理,明确了基底处理后边坡的潜在破坏模式为切层-顺层或切层-顺层-鼓胀。研究成果对软弱基底内排土场边坡稳定控制具有一定的理论指导意义和实际应用价值。
To improve the stability of the side slope of the internal dumping site in the weak basement,the present paper is inclined to reveal the influence of the different segmental treatment projects on side slope stability for the weak basement in the internal dumping site.For the above-said research purpose,take an example of a development project phase at an internal dumping site in an open-pit coal mine,we proposed 15 different basement treatment projects.The independently developed software based on the limit equilibrium theory was used to deal with the weak basement of the inner dumping site in sections,then analyzed the slope stability of 15 different treatment projects.Based on the calculation results to meet the reserve factor of safety,we determined the treatment location and length of the basement,and also selected an economical and reasonable treatment project.Based on the finite difference software of the strength reduction theory named FLAC3D,the displacement cloud map obtained from the numerical simulation results reveal the landslide pattern of the slope,which coincides with the calculation results of the two-dimensional rigid body limit equilibrium method.The two methods verify each other,which fully proves the rationality of the slope stability analysis.The results of the study show that the location of the basement segmentation treatment has a significant effect on slope stability.The closer the basement treatment position is to the foot of the boundary slope,the higher the slope stability is.The slope stability coefficient increases gradually as the length of the basement treatment expands in a logarithmic function.Among the 15 basement treatment projects proposed,Fs/n is the evaluation index to determine an economical and reasonable basement treatment project,and a segmented optimization treatment method for a compliant soft basement is proposed.The numerical simulation results reveal the deformation damage mechanism of the slope and clarify the potential damage mode of a slope are cutting-layer sli
作者
贾兰
蔡雪婷
高世松
王东
JIA Lan;CAI Xueting;GAO Shisong;WANG Dong(Institute of Mining,Liaoning Technical University,Fuxin 123000,Liaoning,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第8期2722-2729,共8页
Journal of Safety and Environment
基金
国家自然科学基金面上项目(51874160)。
关键词
安全工程
露天煤矿
内排土场
稳定性
软弱基底
边坡
safety engineering
open-pit coal mine
internal dumping site
stability
weak basement
side slope
