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挡土牆本身結构的抗滑稳定,是借作用在基底面上的摩擦力(∑N·f),与作用庄基底面上推力(∑T)的比值来表示的。为了增加挡土牆的抗滑稳定性,并减少牆身的断面面积,以节省圬工,經驗証明,将挡上牆基底作成向內傾斜的形式,是設計中一个常用的有效办法。 (如图1)。特別是当設置于土质地基(知f=0.4,〔σ〕=3kg/cm~2)上的挡土牆为滑动控制时,我們經过粗略的比較結果表明;采用傾斜基底(牆底坡为0.1:1)牆身断面面积比釆用平底牆身断面面积减少10％～36％,亦即可以节省圬工約1/10到1/3左右。就是設置在石质地基(如f=0.6,〔σ〕=6kg/cm~2)上的挡土牆,当为滑动控制时,釆用傾斜(牆底坡为0.2:1)基底,其牆身的断面面积一般亦較釆用平基底牆断面要小些。因此从經济意义来看,在这些場合,以釆用斜基底为宜。但是,
The anti-sliding stability of the retaining wall structure itself is expressed by the ratio of the frictional force (∑N·f) acting on the basal surface and the thrust (∑T) acting on the base surface. In order to increase the anti-sliding stability of the retaining wall and reduce the cross-sectional area of the wall to save on completion, experience has shown that it is a common and effective method to design the base of the wall to be inclined inward. (Figure 1). In particular, when the retaining wall set on a soil foundation (known as f=0.4, [σ]=3kg/cm~2) is used for sliding control, we have shown through rough comparison results; using an inclined base (wall slope is 0.1:1) The area of the wall section is reduced by 10% to 36% compared with the area of the flat bottom wall, which means that it can save about 1/10 to 1/3 of the total work. The retaining wall is set on a rocky foundation (eg, f=0.6, [σ]=6kg/cm~2). When it is a sliding control, the foundation is inclined (0.2:1). The cross-sectional area of the body is generally smaller than that of the flat basement wall. Therefore, from an economic point of view, it is advisable to use a sloping base for these occasions. but,