基于正交设计对新疆地区露天煤矿富水火烧区影响边坡稳定性的敏感分析

Sensitivity Analysis of Slope Stability in Water-rich Burning Area of Openpit Coal Mine in Xinjiang Based on Orthogonal Design

露天煤矿边坡所处地质环境在煤层自燃后发生变化,选取密度、黏聚力、内摩擦角、渗透系数、坡高、坡角、水位高度,采用正交设计方法设计“7因素5水平”试验方案,应用SEEP/W与SLOPE/W计算边坡稳定系数,将其作为评价指标,通过极差分析、方差分析方法分析7种因素的敏感性。研究表明:7种因素的敏感性为坡角>水位高度>黏聚力>渗透系数>坡高>内摩擦角>密度,方差分析的影响效应与极差分析顺序一致,黏聚力、渗透系数、坡角、水位高度是主要影响因素,坡高、密度、内摩擦角是次要影响因素。

The geological environment of the open-pit coal mine slopes changes after coal spontaneous combustion.In this study,factors such as density,cohesion,internal friction angle,permeability coefficient,slope height,slope angle,and water level were selected.A"7 factors and 5 levels"experimental design scheme was developed using the orthogonal design method.The SEEP/W and SLOPE/W software programs were employed to calculate the slope stability coefficient,which served as the evaluation index.Sensitivity analysis of the seven factors was conducted using range analysis and variance analysis methods.The study results show that the sensitivity of seven factors is slope angle>water level>cohesion>permeability coefficient>slope height>internal friction angle>density,and the effect of variance analysis is consistent with that of the range analysis.Cohesion,permeability coefficient,slope angle and water level are the main influencing factors,while slope height,density and internal friction angle are the secondary influencing factors.