基于流固耦合计算的露天矿灰岩边坡失稳特征与影响研究  

Characteristics and Effects of Open-pit Mine Tuff Slope Instability Based on Fluid-Solid Coupling Calculation

作　　者：黄金龙 樊玉超 HUANG Jinlong;FAN Yuchao(CHN Energy Xinjiang Toksun Energy Co.,Ltd.,Toksun 838000,China)

机构地区：[1]国能新疆托克逊能源有限责任公司,新疆托克逊838000

出　　处：《煤炭技术》2025年第2期117-120,共4页Coal Technology

基　　金：国家能源集团新疆能源有限责任公司科技创新基金资助项目(新疆能源(2023)3350号)。

摘　　要：边坡的稳定程度影响露天矿区的安全生产,降雨、径流等对露天矿区边坡的稳定造成困扰,当边坡岩土体为灰岩时,地表径流对边坡稳定性的影响尤为显著。以某露天矿灰岩边坡为研究对象,基于非饱和渗流理论中Richards控制方程和VG模型,采用有限元分析软件进行非饱和渗流应力耦合模拟,对持续降雨下灰岩边坡的变形破坏和稳定性进行分析。结果表明:(1)模拟初期边坡稳定性系数下降,但随着模拟时间的持续,边坡稳定性系数趋向于稳定,最终边坡稳定性系数为1.15;(2)模拟过程中边坡渗流场表土负压最先受到影响,由-256.5 kPa变化至-91.6 kPa,但随着模拟时长的增加,渗流场分布趋向于稳定;(3)雨水入渗至边坡内部时,存在明显的瞬态最大剪切应变增量变化区域,主要分布在坡脚处,且随着降雨持续时间的增加,瞬态最大剪切应变增量变化区域增大。The stability of slopes affects the safe production of open-pit mines,and rainfall has a disturbing effect on the stability of slopes in open-pit mines,and the effect of rainfall on the stability of slopes is especially significant when the slope geotechnical body is mud tuff that is prone to disintegration in the event of rainfall.The mud tuff slope of an open-pit mine is taken as the research object,based on the Richards control equation and VG model in the theory of unsaturated seepage,and the finite element analysis software is used to carry out the simulation of unsaturated seepage stress coupling,and analyze the deformation damage and stability analysis of mud tuff slopes under continuous rainfall.The results show that:(1)the slope stability coefficient decreases at the beginning of the simulation,but tends to be stable with the simulation time,and the final slope stability coefficient is 1.15;(2)the negative pressure of topsoil in the seepage field of the slope is first affected during the simulation process,and it changes from-256.5 kPa to-91.6 kPa,but the distribution of the seepage field tends to be stable with the simulation time;(3)when rainwater infiltrates into the interior of the slope,there are obvious transient maximum shear strain increment change areas,mainly distributed at the foot of the slope,and with the increase of rainfall duration,the transient maximum shear strain increment change areas.

关 键 词：露天矿 Comsol 流固耦合 边坡失稳 Richards控制方程 VG模型 

分 类 号：TD824.7[矿业工程—煤矿开采]