摘要
根据安太堡露天矿西北帮边坡工程实践,运用极限平衡理论的方法,借助Slide软件,探讨了进行边坡稳定性分析的3个关键问题,并采用4种极限平衡方法进行了该边坡稳定性的计算和分析;研究了岩体黏聚力、内摩擦角和容重参数对边坡稳定性影响的敏感性,探讨了边坡稳定性规律,提出了相应的加固措施。结果表明:采用路径搜索方法确定边坡最危险滑动面时,滑动面随机搜索次数不小于600次、滑体条分块数不小于20块为宜;计算方法宜同时满足力和力矩平衡。经过计算和分析,该边坡存在滑坡的可能,最危险滑动面穿过坡脚9号煤层,建议对坡脚进行重点加固。9号煤层的黏聚力和内摩擦角及边坡上部粉砂岩1容重和边坡下部页岩2容重等岩体参数的变化对边坡稳定性影响十分明显,建议同时采取坡顶削坡、坡底锚索加固和堆载等措施,相当于减小了粉砂岩1容重,增大了9号煤层的黏聚力和内摩擦角及页岩2容重,从而有效提高了边坡稳定性。
Based on the engineering practice of the northwest slope of Antaibao open-pit mine,limit equilibrium theory and Slide software were utilized to study three key questions to analyze the slope stability.Four kinds of limit equilibrium methods were utilized to calculate and analyze the slope stability.The impact of rock mass parameters,such as rock cohesion,internal friction angle and bulk density,on the sensitivity of the slope stability was studied,and the laws of the slope stability were analyzed,and then corresponding reinforcement measures were proposed.Results show that in the application of the path search method to ascertain the most dangerous sliding surface,the suitable number of random searches of slide surface should not be less than 600 and that of slide blocks should not be less than 20.The calculation method chosen should simultaneously meet the conditions of force and moment balance.Through the calculation and analysis,the sliding of the slope is possible.The most dangerous sliding surface goes through No.9 coal seam at the toe of the slope,which should be reinforced as the emphasis.The changes in rock mass parameters,such as cohesion and friction angle of No.9 coal seam,bulk density of No.1 siltstone at the upper slope and No.2 shale at the lower slope,affect slope stability obviously.Measures including slope cutting at the upper slope,reinforcement with anchors and stacking load at the lower slope and other measures in the meanwhile are recommended.These measures are equivalent to reducing the bulk density of No.1 siltstone and increasing the cohesion and internal friction angle of No.9 coal seam as well as bulk density of No.2 shale,which can effectively improve the slope stability.No.9 coal seam and bulk density of No.2 shale,which can effectively improve the slope stability.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第11期1806-1811,共6页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50974078)
国家住房与城乡建设部资助项目(2009-R2-16)
关键词
露天矿边坡
稳定性
参数敏感性
极限平衡方法
路径搜索法
边坡加固
open-pit mine slope
stability
parameters sensitivity
limit equilibrium method
path search method
slope reinforcement
