宜毕高速公路K3段震后边坡滑坡应急处置研究

为了有效控制震后山体滑坡、崩塌现象的蔓延，保证高速公路建设及运营安全，以震后宜毕高速公路K3段为研究对象，开展震后应急勘察工作，采取注浆、排水和反压等手段对边坡滑坡进行位移和沉降监测。利用Geostudio中的Slope/W模块分析加固后的滑坡稳定性，计算边坡的屈服加速度，提出根据预应力锚索进行加固的治理方案。结果表明，滑坡在地下水和地震的共同作用下产生，土体薄层状结构及岩层顺倾均加剧了滑坡形成，尽管地震作用对边坡整体稳定性有较大影响，但实施的应急处置措施遏制了滑坡的进一步变形，经过计算，边坡加固处理后屈服加速度为0.07g，安全系数为1.3，符合相关规范要求。可见，边坡滑坡体位移在震后初期得到了有效控制，治理措施有效提高了该边坡的稳定性。处置方案对类似高速公路的建设与维护具有借鉴意义。

Research on emergency treatment of slope landslides at K3 section of Yi-Bi Expressway after earthquake

In order to effectively control the spread of landslides and collapses after the earthquake, and to ensure the safety of expressway constructions and operation, the K3 section of Yi-Bi Expressway was taken as the research object to carry out a post-earthquake emergency survey. The displacement and settlement of the slope landslide were monitored by the methods of grouting, drainage and back-pressure. The Slope/W in Geostudio was used to analyze the stability of the reinforced landslide and to calculate the yield acceleration. And the treatment scheme of slope reinforcement was proposed by using prestressed anchor cables. It is shown that the landslide is caused by the combined action of groundwater and earthquake, and is exacerbated by the thin layered structure of soil and the layered rock with inclination, although the overall stability of the slope is impacted by the earthquake, the emergency treatment scheme can prevent the landslide from further deformation. The yield acceleration after the slope reinforcement is 0.07g and the safety factor is 1.3 based on the calculation, which can meet the requirements of correlative specifications. It is thus clear that the slope landslide displacement is effectively controlled in the early post-earthquake period; the stability of the slope is effectively improved by the treatment measures. The treatment scheme results provides a reference for the construction and maintenance of similar expressways.