露天灰岩矿边坡稳定性分析及治理技术

Stability Analysis and Treatment Technique of the Slope of Open-pit Limestone Mine

根据某灰岩矿边坡工程地质条件,经过钻探取样及岩石强度试验,较好地预测了靶区边坡软弱层的展布规律,运用FLAC3D软件进行数值模拟,结果表明,露天矿顺层开挖边坡稳定性较差且影响因素较多,边坡结构敏感性控制因素为边坡角和软弱层,边坡角稍大于地层结构面倾角的情况对边坡稳定性影响较大,同时,边坡风化面以下软弱层的分布情况和相关排水条件是边坡支护工程时效性的决定因素。建议采用透水性水泥钢筋混凝土预制锚杆抗滑治理,结合微斜水平井排水系统可进一步提高矿山不稳定边坡的治理效果。

Based on the slope engineering geological condition of a limestone mine, the distribution rule of slope weak layer of target zone is predicted effectively and numerical simulation is conducted by u- sing FLACD3D software by conducting drilling sampling and rock strength test. The results show that the slope stability for bedding excavation of open-pit mine is poor, and many influence slope stability factors are existed, the slope angle and weak layer are the sensitivity controlling factors of slope structure, if the slope angle is greater than the angle of strata structure plane, the slope stability will be affected seriously, the distribution situation of the weak layer below the slope weathered surface and some related drainage conditions are the decisive factors of the timeliness of slope support engineering. It is suggested that the anchor can be prefabricated by using reinforced concrete with the characteristics of water permeability to deal with the landslide, combing with slightly inclined horizontal well drainage system, the treatment effects of the unstable slopes in mines can be further improved.