【摘要】 为了探讨地震和煤矿采动耦合作用下的露天矿边坡及采空区的稳定性,以辽宁排山楼金矿露天转井工开采为研究对象,基于FLAC3D有限元分析平台,采用强度折减法研究了未进行煤炭开采时和煤矿采动单独作用下露天矿边坡的安全系数,重点探讨了煤矿采动和地震耦合作用下露天矿边坡及采空区应力场、位移场及塑性区的分布规律。结果表明:未经采动时,露天矿边坡的安全系数为1.21,边坡处于稳定状态;煤矿采动后露天矿边坡安全系数降为1.12,仍处于稳定状态,单独的煤矿采动作用不会导致露天矿边坡失稳;在地震和煤矿采动耦合作用下,露天矿边坡坡体内出现了较大的拉应力,采空区顶板出现冒落现象,底板出现底鼓现象;在地震和采动耦合作用下,边坡将出现失稳破坏,破坏形式主要为采动区顶板的大面积冒落和边坡的崩塌。更多还原

【Abstract】 To analyze the stability of slope and goaf of open-pit mine caused by the coupling effect of earthquake and mining,we take the opencast-to-underground mining of Paishanlou gold mine in Liaoning Province as the research object. Based on FLAC3 D platform,we study the security coefficients of the slope of open-pit mine in unexploited case and under the action of mining by strength reduction method. On the basis of it,we focus on the distribution law of the stress field,displacement field and plastic zone of the slope and the goaf of open-pit mine under the coupling effect of earthquake and mining. The research result show that the security coefficient of the slope of open-pit mine is 1. 21 before mining and decreases to 1. 12 after mining,and the slope is in the state of stable before and after mining,so the single mining effect cannot lead to the instability of slope. Under the coupling effect of earthquake and mining,the strong tensile stress appears within the slope body of open-pit mine,the caving happens to the roof and the pucking occurs to the roof in the goaf,and the slope will be instable and destroyed,and the forms of destroy are mainly the carving of roof in large-sized area and the collapse of slope in the goaf.更多还原