摘要
为研究含软弱夹层顺倾岩质边坡在不同充水条件下的变形、破坏及滑动演化全过程,以云南省鹤庆县某金属露天矿山为研究对象,采用基于连续-非连续方法的数值模拟软件GDEM建立二维计算模型,模拟在充水作用下含双弱层岩质边坡的变形、破坏直至最终失稳滑动的演化过程。研究结果表明:(1)矿区充水后,在水压力作用下,抑制边坡坡面横向裂缝发育,从而横向位移及竖向位移也有所减小;(2)无水及充水条件下,含软弱夹层顺倾岩质边坡同样表现出完整的蠕变三阶段理论,即减速蠕变阶段、等速蠕变阶段及加速蠕变阶段;(3)矿坑充水后起到压坡脚效果,但需合理设置水位高度,即能抑制边坡横向及竖向变形,同时也需考虑过高水位对边坡岩体的软化效果。研究结果为采后矿区闭坑充水治理及矿坑水蓄能循环利用提供了依据。
To study the entire process of deformation,failure,and sliding evolution of inclined rock slopes with weak interlayers under different water filling conditions,a metal open-pit mine in Heqing County,Yunnan Province was taken as the research object.A two-dimensional computational model was established using the continuous discontinuous method based numerical simulation software GDEM to simulate the deformation,failure,and ultimate instability and sliding evolution of rock slopes with double weak interlayers under water filling.The research results indicate that:(1)after water filling in the mining area,under the action of water pressure,the development of lateral cracks on the slope surface is suppressed,resulting in a decrease in both lateral and vertical displacement;(2)Under both waterless and water filled conditions,inclined rock slopes containing weak interlay-ers also exhibit a complete three-stage creep theory,namely deceleration creep stage,constant velocity creep stage,and acceleration creep stage;(3)After filling the mine pit with water,it has a pressure effect on the slope foot,but it is necessary to set the water level height reasonably,which can suppress the lateral and vertical deformation of the slope,and also consider the softening effect of high water level on the slope rock mass.The research results provide a basis for the treatment of closed pit water filling and the recycling of mine water storage in post mining mining areas.
作者
李建东
LI Jiandong(Heqing Beiya Mining Co.,Ltd.,Dali 671507,Yunnan,China)
出处
《矿产勘查》
2024年第S01期47-55,共9页
Mineral Exploration
关键词
CDEM法
充水
岩质边坡
变形
软弱夹层
CDEM method
water filling
rock slope
deformation
weak interlayer
