考虑节理裂隙的复杂岩质边坡稳定性控制技术

Stability Control Technology of the Complex Rock Slope Considering Joint Fissures

节理裂隙是影响边坡稳定性的重要因素之一,为研究含有节理裂隙的岩质边坡稳定性,以衡山县紫景轩边坡支护工程为研究背景,采用定性和定量分析方法对该边坡的稳定性进行评价.定性分析揭示该边坡存在多组不利的岩层结构面、节理面和组合交线,沿YC5-J3,YC6-J5和YC9-J7组合交线的稳定性最差;定量分析表明该边坡支护前在自重及暴雨工况下处于不稳定-基本稳定状态.为此,提出一种格构式锚杆(索)挡墙、挂网喷混、注浆钢花管和坡脚浆砌块石挡墙相结合的支护方案,并辅以截排水工程以及监测措施.最后,通过指定潜在滑裂面和自动搜索最危险滑面的方式,采用理正岩土软件计算得出支护后的边坡稳定性系数满足规范要求.该支护方案能有效控制含有节理裂隙的岩质边坡的稳定,可为类似的矿山边坡支护设计提供技术支撑.

The joint fissure is one of the important factors that affect the stability of slopes.In order to study the stability of rock slopes with joint fissures,the supporting project of Zijingxuan slope in Hengshan County is taken as the research background,and the stability of the slopes is evaluated using qualitative and quantitative analysis methods.The qualitative analysis reveals that there are multiple groups of unfavourable rock stratum structural surfaces,joint surfaces,and combined intersection lines in the slope,and the stability is the worst along the combinational intersecting lines of the YC5-J3,YC6-J5,and YC9-J7.The quantitative analysis shows that the slope is in an unstable to basically stable state under the condition of the self-weight and rainstorm before supporting.For this reason,a support scheme is proposed,which is combined with the lattice anchor(cable)retaining wall,hanging net sprayed concrete,grouting steel floral tube,and slope foot slurry block stone retaining wall,supplemented by the drainage project and monitoring measures.Finally,the stability coefficient of the slope after support is calculated by the Lizheng geotechnical software to meet the specification requirements by specifying the potential slip surface and automatically searching for the most dangerous slip surface.The stability of rock slopes with joint fissures can be effectively controlled by this support scheme,and technical support for similar mine slope support designs can be provided.