大型深层牵引式滑坡的处治方案研究

Study of Treatment Scheme of Large Deep Retrogressive Landslide

针对某高速公路路堑边坡滑坡现象,基于滑坡路段的工程地质条件和深层水平位移测试数据,确定了滑坡类型,利用Plaxis有限元软件对比分析了针对滑坡类型提出的3种处治方案,综合考虑施工工艺、环境保护等影响因素确定了最佳处治方案,通过深层水平位移监测验证了滑坡处治效果.研究结果表明:该滑坡面积和滑块体积大、影响土层厚,为大型深层牵引式滑坡;分级支挡、单排h型抗滑桩和清方减载3种处治方案条件下边坡稳定性安全系数接近,最佳处治方式为施工工艺最成熟的分级支挡;治理后的深层水平位移监测结果表明处治方案能够保证边坡的稳定性.

According to the landslide phenomenon of a highway cutting slope,the landslide type is determined based on engineering geological conditions and deep horizontal displacement test data of landslide sections.Plaxis finite element software is used to calculate the three treatment schemes proposed for landslide type,taking into account the construction technology,environmental protection and other factors to determine the best treatment scheme;through the deep level of displacement monitoring to verify the effect of landslide treatment.The results show that the landslide area and the volume of the slider are large and the thickness of the soil is thick,which is the large-scale retrogressive landslide.The safety factors of slope stability of three treatment schemes,i.e.graded support,single row h-type anti-slide pile and clear the earth to reduce the load,are close;grading support that the construction process is the most mature is the best treatment scheme.The results of deep horizontal displacement monitoring show that the treatment method can ensure the stability of the slope,so as to provide certain reference significance to analysis and governance of same types of landslides.