饱和黏土中倾斜圆形锚板承载力分析

采用三维弹塑性有限元方法计算并比较了均质饱和黏土中圆形锚板在不同埋深和上拔倾角下的承载力,阐明了埋深和倾角对锚板承载力的影响,并给出了倾斜圆形锚板承载力的简单计算公式.研究表明,倾角对浅埋锚板的承载力影响较大,当锚板处于深埋状态(大于7D),倾角对承载力的影响可以忽略;锚板承载力随埋深的增加而增加,当锚板埋深超过7D,锚板承载力不再变化;对于浅埋锚板,锚板边缘附近的应力要比其他部位高很多,这对工程设计非常重要;土的相对重量是影响锚板周围土体的流动机制和锚土分离的重要因素,当其介于5～7时,锚板与土将会分离.

Pull-out capacity of inclined circular plate anchors in saturated clay

3D elasto-plastic (EP) finite element analysis is applied to evaluate the uplift capacity of the inclined circular anchors in undrained clay. Results are presented in the familiar form of break-out factors based on various anchor embedded depth and orientation. The effect of soil weight on the stability and soil flow mechanism is also discussed. Finally, a simple empirical relationship is given to evaluate the uplift capacity of inclined circular anchors. From the calculated results, it can be found that for shallow embedded anchor the effect of orientation on the uplift resistance is greater than that for deep one. The stress close to the anchor brim is much higher than that on the other part of the anchor. When the embedded depth is deeper than 7 D , the embedded depth and the orientation have no effect on the uplift resistance. The soil relative weight determines the separation between anchor and soil. When it is 5-7, the anchor will be separated from the soil.