矿山露采边坡滑移-弯曲变形与机理研究

Study on Slipping-bending Deformation and Mechanism of Open-pit Mining Slope

以江西某矿山露采边坡为研究对象,确定了该边坡的破坏模式为:顺断层面滑移-岩板弯曲-追踪千枚岩片理面,最终沿坡脚剪出破坏,或“溃曲”破坏。基于梁板理论的边坡稳定性分析表明:①滑移-弯曲变形可以发生于雁列式断层发育区的岩质边坡,其滑移面主要沿断层(带)面发育;②按照岩板弯曲导致的拉应力与抗拉强度大小以及边坡坡脚剪应力与千枚岩片理面长期抗剪强度大小,不同坡长(30,60,100m)时,该边坡变形破坏可划分为4种形式,即:稳定、滑移-弯曲变形、滑移-弯曲破坏、弯曲-滑移破坏且沿坡脚千枚岩片理面剪切滑移破坏;③滑移面裂隙水压力对滑移-弯曲变形影响较大,稳定性分析时应予以考虑。

Taking the open-pit mining slope of a mine in Jiangxi province as the research object,the failure mode of the slope is determined as follows: slippage along the fault plane-rock plate bending-tracing the schistosity plane of phyllite,and eventually the failure occurs along the foot of the slope or “collapse” failure occurs.The result of stability analysis based the plane theory shows that:① the slipping-bending deformation can occur in the rock slope of the en-echelon type fault development area and the slippage plane mainly develops along the fault (belt) surface;② according to the tensile stress caused by the bending of rock slab,as well as the shear stress at the foot of slope and the long-term shear strength of schistosity plane of phyllite,at different slope lengths (30,60,100 m),the slope deformation and failure can be divided into stability, slipping-bending deformation,slipping-bending failure,bending- sliding failure and shear-slip failure along the foot of slope;③ The crack water pressure on the slip plane has a great influence on the slipping- bending deformation,which should be considered for the analysis of stability.