开采-渗流耦合作用下含正断层露天矿边坡变形规律研究

Study on deformation law of normal fault and slope stability under the action of mining-seepage

为研究开采扰动及地下水渗流耦合作用下含正断层露天矿边坡变形规律问题,以某露天矿含断层边坡为研究对象,应用FLAC3D建立含断层边坡数值模型,通过设置不同开挖深度及地下水抽采深度,研究其在开采-渗流耦合作用下,断层及边坡位移场、渗流场变化特征。结果表明:随着采深的增加,断层x方向最大位移逐渐增大;断层破坏模式以拉张断裂为主,随着开采及抽采的进行,应力集中分布形式从散点式向线性分布发展;断层从间断式破坏逐步发展为贯通式破坏,随着开采的延深,塑性区范围逐渐增大;边坡受开采及地下水渗流影响,稳定性逐渐下降,在地下水赋存条件下边坡整体稳定系数下降1.34%。

In order to study the fault deformation law under the combined action of mining disturbance and groundwater,this article uses FLAC3D to establish a numerical model of slope with faults.By setting different excavation depths and groundwater extraction depths,the article explores the change characteristics of fault and slope displacement field and seepage field under the coupling action of mining and seepage flow.The results show that with the increase of mining depth,the maximum displacement of fault in X direction gradually increases.The main failure mode of the fault is tension fracture.With the development of mining and extraction,the distribution form of stress concentration changes from scattered point to linear distribution.The fault develops from discontinuous failure to through failure.With the deepening of mining,the range of plastic zone increases gradually.Affected by mining and groundwater seepage,the stability of the slope gradually decreases.Under the condition of groundwater,the overall stability coefficient of the slope decreases by 1.34%.