摘要
为研究富水烧变岩边坡地下水渗透特性及其稳定性,以某露天煤矿南端帮边坡为研究对象,采用SEEP/W分析了采动影响下富水烧变岩边坡地下水渗透特性,并基于地下水渗透特性,采用Slope/W对边坡稳定性进行了分析。结果表明:受采动影响,烧变岩边坡地下水渗透路径发生变化,地下水沿细砂岩层和砂岩层向前缘渗透,至坡体临空面附近逐渐向上部煤层台阶和细砂岩层台阶渗出,少量从砂岩层台阶渗出。随采深增加,两透水层渗透速度增加,坡体前缘流量增加,地下水接近临空面附近渗透速度迅速下降,砂岩层渗透速度跃变位置滞后于细砂岩层;倾角增加,透水层渗透速度增加;砂岩层地下水从坡脚附近渗出;受采动和地下水双重影响下边坡稳定性持续下降;地下水对边坡稳定性的影响大于采动对边坡稳定性的影响;随采深增加,地下水对边坡稳定性影响保持稳定,倾角增加,地下水对边坡稳定性影响增加。
In order to study the groundwater seepage characteristics and the stability of water-rich burnt rock slope,take the south side slope of an open-pit coal mine as the research object,the groundwater seepage characteristics of the water-rich burnt rock slope under the influence of mining disturbance were analyzed by SEEP/W and the stability of the slope was analyzed by slope/W based on the characteristics.The results showed that under the influence of mining disturbance,the seepage path of groundwater in the burnt rock slope had changed,and the groundwater seeped along the front edge of fine sandstone and sandstone layer,and gradually seeped up to the upper steps of coal seam and the steps of fine sandstone layer near the free face of the slope,a small amount seeped from the steps of sandstone layer.With the increase of mining depth,the seepage rate of the two permeable layers increased,the flow rate of the slope front increased,the seepage rate of the groundwater decreased rapidly near the free face,and the jump position of seepage rate of the sandstone layer lagged behind that of the fine sandstone layer;as the inclination angle increased,the seepage rate of the permeable layer increased;sandstone groundwater seeped around the foot of the slope;the slope stability continued to decline under the influence of mining and groundwater,and the influence of groundwater on slope stability was greater than that of mining;with the increase of mining depth,the influence of groundwater on slope stability remained stable,and the influence of groundwater on slope stability increased with the increase of inclination angle of slope.
作者
王建国
白宇
刘明明
WANG Jianguo;BAI Yu;LIU Mingming(China Energy Xinjiang Tuokexun Energy Co.,Ltd.,Urumqi,Xinjiang 830002,China)
出处
《中国煤炭》
2023年第12期51-60,共10页
China Coal
关键词
富水烧变岩
地下水渗流特性
渗流路径
采动边坡
边坡稳定性
water-rich burnt rock
groundwater seepage characteristics
seepage path
mining slope
slope stability
