含断层构造露天边坡变形破坏特征及稳定性研究

Deformation and Failure Characteristics and Stability of Open-Pit Slopes with Fault Structure

为了探究断层构造对露天边坡变形破坏特征及稳定性的影响,采用遥感影像、现场调查与数值模拟研究手段开展了含断层构造的露天边坡变形破坏特征及安全系数计算研究,并进行了边坡变形破坏发展分析,揭示了含断层构造露天边坡变形破坏特征规律。结果表明:露天采场北部边坡产生滑塌灾害是断层构造(内因)、井下矿体开采卸荷(外因)共同作用的结果。在地下矿体开采扰动与F15断层切割的作用下,边坡易形成沿断层构造滑坡垮塌并不断扩大滑塌区域。F15断层构造以上坡体的变形位移相对较大,且沿F15断层构造向东部沟谷发展,F15断层构造改变了北部边坡上部坡体的变形破坏趋势。露天采场边坡安全系数为1.45时,潜在滑动面为F15断层构造;北部边坡沿断层构造尚未出现大变形。

As for the open-pit slope with fault structure,studies on its deformation and failure characteristics were carried out by means of remote sensing images,field investigation and numerical simulation,and its safety factor was also calculated,so as to explore the influence of fault structure on slope stability.Then,based on the analysis of deformation and failure process of slope,the failure rule for open-pit slope with fault structure was discussed.It is found that the landslide hazard occurring on the north slope of the open-pit mine is attributed to an internal factor of fault structure combined with an external factor of unloading by underground mining.Under the combined action of disturbance by underground mining and cutting by F15 fault,a landslide is prone to occur along the fault structure,and then the failure zone will be gradually expanded.The deformation and displacement of upper slope above the F15 fault structure becomes relatively larger,and proceeds towards the eastern bottom along the F15 fault structure.The F15 fault structure changes the deformation and failure trend of the upper part of the northern slope.It is shown that when the safety factor of open-pit slope is 1.45,F15 fault zone is the potential sliding plane,and no larger deformation has occurred along the fault zone of the northern slope.