内蒙白音华一号露天煤矿首采区南(非工作)帮边坡稳定性评价

Slope Stability Assessment of South (Non-working) Wall in First Winning District of Baiyinhua No.1 Surface Coalmine

根据工程地质勘察成果,分析了首采区南(非工作)帮边坡岩体的工程地质条件,并据此进行了岩石物理力学性质统计,软弱层(面)分布特征以及泥岩、炭质泥岩对地下水敏感度等研究。在此基础上建立了不同条件下不同滑面类型的边坡极限平衡法数值分析模型,并进行了相应的边坡稳定性计算成果评价,由此提出了南(非工作)帮边坡角的建议值:次边坡角采用值α1≤13°,主边坡角采用值α2≤19°。根据评价结果提出了修正岩体力学参数、合理调整采区和留设安全煤壁的建议。该评价结果为露天煤矿总平面设计系统中的边坡设计提供了依据。

Based on the engineering geological exploration data,analyzed engineering geological conditions of the south（non-working） wall in the first winning district of the Baiyinhua No.1 surface coalmine.On these grounds,have carried out statistics of rock physical and mechanical properties,and studies on weak layer（surface） distribution features and water sensitivity of mudstone,carboniferous mudstone.Then established slope limit equilibrium method numerical analysis models of different slip surface types under different conditions and carried out corresponding slope stability computed results assessment.Thus slope angle proposed values of south（nonworking） wall put forward： secondary slope angle adopted values α1≤13o,main slope angle adopted values α2≤19o.According to assessed result,suggestions of to revise rock mass mechanical parameters,rationally adjust winning area and safety coal wall leaving put forward.The result has provided basis for slope design in surface coalmine overall planar design system.