渭北旱塬黄土边坡稳定性分析及治理措施研究——以三原县清河国家湿地公园为例

Study on Stability Analysis and Treatment Measures of Loess Slope in Weibei Arid Plateau——Take Qinghe National Wetland Park in Sanyuan County as an example

以陕西省渭北旱塬三原县清河湿地公园黄土边坡为研究对象,利用数值模拟计算对黄土边坡在天然、分级开挖和锚杆+梁格支护等多种条件下的坡体变形及塑性区范围进行分析,并通过强度折减法计算各条件下的安全系数,对边坡稳定做出评价,用于指导项目设计及施工建设。结果表明:天然边坡整体处于稳定状态;上部坡体开挖具有卸荷效应,安全系数增大;下部坡体开挖,导致阻滑力减小,安全系数降低;持续降雨会导致坡体强度降低,安全系数减小;采用锚杆+格梁加固方式可较大提高坡体稳定性。

Taking the loess slope of Qinghe Wetland Park in Sanyuan County on Weibei Dryland,Shaanxi Province as the study object,numerical simulation is used to calculate the loess slope under various conditions such as natural,graded excavation and anchor+beam grid support.The slope deformation and plastic zone range are analyzed,and the safety factor under various conditions is calculated by the strength reduction method,and the slope stability is evaluated,which is used to guide the project design and construction.The results show that the natural slope is in a stable state as a whole;the excavation of the upper slope has an unloading effect and the safety factor is increased;the excavation of the lower slope leads to a reduction in the slip resistance and a decrease in the safety factor;continuous rainfall will lead to the strength reduction of the slope;the application of anchor rod+lattice beam reinforcement can significantly improve the stability of the slope.