基于数值分析的浅埋煤层采动滑坡稳定性研究

Study on stability of mining landslide in shallow coal seam based on numerical analysis

以贵州某矿上部山体崩滑地质灾害为例,采用离散元及有限元数值分析方法,建立崩滑体二维、三维数值计算模型,计算出煤矿上部坡体在地下采掘作用下其稳定系数变化过程,并从位移、应力和应变方面对山体失稳过程分析崩滑体的形成机制。研究结果表明:天然工况下煤矿地下采掘活动对上部山体稳定性造成影响,当地下采煤活动临近山体时,采掘活动对山体稳定性影响较小,但是,当采掘活动在山体下部进行时,其对山体稳定性影响逐渐增大,这说明了地下采掘活动是导致贵州某矿上部山体发生崩滑灾害的发生主要因素之一。

This article takes the geological disasters of avalanches and landslides in the upper mountain of a mine in Guizhou Province as an example,and uses discrete and finite element numerical analysis methods to establish two-dimensional and threedimensional numerical calculation models of slumped mass.The change process of the stability coefficient of the upper slope of the coal mine under the action of underground excavation is calculated,and the formation mechanism of the collapse body is analyzed from the aspects of displacement,stress and strain of the mountain instability.The research results show that the underground mining activities of coal mines under natural conditions have an impact on the stability of the upper mountain.When the local underground coal mining activities are close to the mountain,the mining activities have little effect on the stability of the mountain.However,when the mining activities are carried out in the lower part of the mountain,its influence on the stability of the mountain gradually increases,which shows that underground mining activities are one of the main factors leading to the occurrence of avalanche disasters in the upper mountain of a mine in Guizhou Province.