备战铁矿高海拔高寒边坡的稳定性分析

Stability analysis of slope in high altitude and arctic-alpine of Beizhan iron mine

为评价高海拔高寒地区矿山边坡在极端恶劣条件下的稳定状况,揭示矿山边坡的破坏机理,以新疆备战铁矿矿区边坡Ⅰ-Ⅰ剖面为研究对象,通过折减系数法确定岩体物理力学参数,采用3DMine-Surfer-Rhino-ANSYS多软件相耦合方式建立矿区边坡Ⅰ-Ⅰ剖面的计算模型;运用FLAC 3D软件模拟备战铁矿矿山边坡变形过程,对变形过程边坡塑性区、位移和应力大小进行分析。结果表明:边坡东帮顶部区域发生剪应力屈服并有塑性区产生,其他区域没有塑性区产生;边坡底部水平位移最大变化量为16 mm,竖直位移最大变化量为92 mm;开挖后边坡底部水平应力最大值为4.0×10^6 MPa,竖直应力最大值为4.0×10^6 MPa。因此,矿体开采期间,东帮边坡底部区域易发生应力集中,稳定性较差,为防止边坡失稳现象的发生,应重点在边坡底部采取加固措施。

In order to evaluate the stability of the mine slope in the high altitude and arctic-alpine areas under extreme harsh conditions,and reveal the failure mechanism of the mine slope,the iron ore mining slope Ⅰ-Ⅰ profile of Beizhan iron mine in Xinjiang was taken as the typical research object,and the physical and mechanical parameters of rock mass was determined through the reduction factor method.Meanwhile,the combination of the calculation model of slope Ⅰ-Ⅰ profile was established by using the 3DMine-Surfer-Rhino-ANSYS;Moreover,the iron ore mining slope stability was investigated by FLAC 3D numerical simulation and analysis of the plastic zone of slope,the size of the displacement and stress was conducted.The results showed that only the top of the eastern side of the slope had a plastic zone,and the shear stress yield occurred in the slope.The maximum change of horizontal displacement at the bottom of the slope was 16 mm,and the maximum change of vertical displacement was 92 mm.After excavation,the maximum horizontal stress at the bottom of the slope was 4.0×10^6 MPa,and the maximum vertical stress at the bottom of the slope was 4.0×10^6 MPa.Thus,it can be concluded that the stress concentration phenomenon was easy to occur at the bottom of the slope of the east slope when the ore body was mined,the stability of the slope at the bottom changed,and the slope was in a slightly unstable state.Therefore,in the actual preparation for iron ore mining,in order to prevent the occurrence of slope instability,measures should be taken to stabilize the bottom slope.