锚杆挡墙加固高陡土质边坡设计探讨——以岗白路K8+290~K8+400段路基边坡为例

Discussion on the Design of Anchor Rod Retaining Wall Strengthening High Steep Soil Slope:Taking the slope of the K8+290~K8+400 section of Gangbai Road as an example

在公路建设和运营过程中,路基边坡时常发生垮塌事故,尤其是具有高陡临空面的土质边坡,常规挡土墙、桩基托梁挡墙或桩板墙等措施工程规模大,且施工难度高,工程造价不菲,在山区往往不具备可操作性。为降低此类条件下工程施工难度和造价,依托国道215线岗托至白玉段白格滑坡堰塞湖灾后恢复重建工程中K8+290~K8+400段路基下边坡处治案例,采用锚杆挡墙对高陡土质边坡进行加固,经数值模拟得出该边坡治理前后应力场、位移场变化特征与规律,锚杆挡墙能够有效解决边坡下滑分力的应力集中作用,锚杆的抗拉、抗剪作用提升边坡下滑稳定性,挡墙作为面板使锚杆整体受力,两者综合使用提高整体治理效果。从实际应用效果来看,锚杆挡墙技术施工周期短,可节约工程造价,并且可以满足施工保通条件,其在这类高陡土质边坡防护中具有适用性。

In the process of highway construction and operation,roadbed slopes often collapse accidents,especially soil slopes with high and steep free surfaces.Conventional retaining walls,pile foundation support beam retaining walls,or pile sheet walls and other measures have a large engineering scale,high construction difficulty,and high engineering cost,and often do not have operability in mountainous areas.In order to reduce the difficulty and cost of engineering construction under such conditions,relies on the case study of slope treatment under the K8+290~K8+400 section of the Baige landslide and dammed lake disaster recovery and reconstruction project on the National Highway 215 from Gangtuo to Baiyu.Anchor rod retaining walls are used to reinforce high and steep soil slopes.Through numerical simulation,the characteristics and laws of stress and displacement field changes before and after the slope treatment are obtained,Anchor rod retaining walls can effectively solve the stress concentration effect of slope sliding components.The tensile and shear resistance of anchor rods enhance the stability of slope sliding.The retaining wall serves as a panel to force the anchor rod as a whole,and the combined use of the two improves the overall governance effect.From the practical application effect,the anchor rod retaining wall technology has a short construction period,can save engineering costs,and can meet the construction safety conditions.It has applicability in the protection of such high and steep soil slopes.