基于边坡渐进破坏特征的控制设计——以湖北省十堰市布袋营边坡为例

Control design based on progressive failure characteristics of slope:taking Budaiying slope in Shiyan city,Hubei province as an example

边坡抗滑设计一般采用的是传统强度折减法(如不平衡推力法等),其设计力的依据为不平衡推力等。在分析边坡沿滑面应力分布的基础上,提出了沿滑面3种不同抗滑措施的布置方法;通过对边坡稳定性抗滑设计的计算研究,提出了不同工况下抗滑力的取值方法;结合边坡多参量时空稳定性评价指标,创建了边坡抗滑设计中的分项系数设计方法,并定义了主滑方向和边坡破坏概念。将提出的边坡抗滑措施的布置和抗滑力的取值方法、分项系数设计方法应用于工程(如湖北省十堰市布袋营滑坡)实践,经过多年的运行表明:该抗滑设计的防治措施位置选取、抗滑力的决定及分项系数设计方法是可行的。

The traditional strength reduction method(such as the unbalanced thrust method) is generally used in slope control design,and the design control force is based on unbalanced thrust,etc.Based on the analysis of the in-situ stress distribution along the sliding surface of slope,the three layout methods of control measures along the sliding surface are put forwards in this paper.Through the calculation and research on slope stability and anti-sliding design,the determination method of anti-sliding force under different boundary(or working) conditions is suggested.With the help of the multi-parameter space-time stability evaluation index of slope,a partial coefficient method for anti-sliding control design is developed,and the definitions of main sliding direction and slope failure are put forward.The proposed anti-sliding measure layout,anti-sliding force determination and partial coefficient design method in this paper are applied to the engineering(such as Budaiying slope in Shiyan city,Hubei province).The results demonstrate that the location selection of control measures,the determination of anti-sliding force and the partial coefficient design method of the slope are feasible after years of run.