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以极限分析上限理论为基础,利用旋转块体集的组合来构造条形锚板的运动许可速度场。分析了不排水黏土中深埋和浅埋条形锚板的抗拔承载力上限解,研究了锚板在不同埋置倾角和深度条件下的抗拔承载力和破坏面的特性,并将计算结果与已有计算方法进行了对比。分析结果表明:在不排水黏土中深埋条形锚板抗拔承载力与锚板的埋置方位和锚板的粗糙度无关,但完全光滑条件下破坏面扇圆部分的半径只有完全粗糙条件下的一半;在考虑无重土情况下浅埋条形锚板的抗拔承载力系数随锚板埋深比的增大而增大,破坏面也随埋深比的增加而逐渐扩大。所得上限解与已有文献解答较为吻合,而且求解所得破坏面更为直观,能为工程设计提供参考依据。
Based on the limit analysis upper bound theory, the combination of rotating block sets is used to construct the motion permitting speed field of strip anchor plate. The upper limit solution of the pull-out bearing capacity of deep and shallow buried anchor plates in undrained clay was analyzed. The anti-pull bearing capacity and failure characteristics of the anchor plate under different buried inclination and depth conditions were studied. The result is compared with the existing calculation method. The analysis results show that the pull-out bearing capacity of deep-buried anchor plate in undrained clay has nothing to do with the anchor orientation and the roughness of the anchor plate. However, the radius of the circular part of the failure surface under the complete smooth condition is only the complete roughness Under the condition of no heavy soil, the coefficient of uplift bearing capacity of shallow anchor plate increases with the increase of anchor depth ratio, and the failure surface also gradually expands with the increase of buried depth ratio. The obtained upper bound solution is in good agreement with the existing literature solutions, and the obtained damage surface is more intuitive and can provide a reference for engineering design.