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通常计算斜坡的抗滑安全系数F常假定滑动面为圆弧面或曲面,将抗滑安全系数F定义为抗滑力矩与滑动力矩之比,采用瑞典分条法计算F值。但在一些开挖工程中常遇到的是在倾斜硬土层上的滑坡,这种滑坡的特点是滑动由直线段及曲线段组成的复合滑动面,如图1。这类滑坡不适于采用瑞典圆弧法,应改用适合普遍情况的其它方法。本文采用了这类方法之一的毕晓普(Bishop)方法。惯用的毕晓普法仍用分条法,计算繁复,但可以根据毕晓普法的原理,结合现场滑坡的观测,将曲面部分简化为圆弧面,将
Generally, the anti-sliding safety factor F of a slope is usually assumed to be an arc surface or a curved surface. The anti-sliding safety factor F is defined as the ratio of the anti-sliding torque and the sliding torque, and the Swedish value is used to calculate the F value. However, in some excavation projects, landslides are often encountered on inclined hard soils. This type of landslide is characterized by the sliding of a composite sliding surface composed of straight sections and curved sections, as shown in Figure 1. Such landslides are not suitable for the Swedish arc method and should be replaced by other methods suitable for general conditions. This article uses the Bishop method of one of these methods. The conventional Bishop method still uses the strip method to calculate the complexity, but according to Bishop’s principle, combined with the observation of the on-site landslide, the curved surface part is simplified as an arc surface.