LIMIT ANALYSIS OF ULTIMATE PULLOUT CAPACITY OF SHALLOW HORIZONTAL STRIP ANCHOR PLATE BASED ON NONLINEAR FAILURE CRITERION
LIMIT ANALYSIS OF ULTIMATE PULLOUT CAPACITY OF SHALLOW HORIZONTAL STRIP ANCHOR PLATE BASED ON NONLINEAR FAILURE CRITERION
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发表时间：
2014
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通讯作者：
Wang Hong-ta
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作者：
Wang Hong-ta
基于非线性摩尔 - 库仑破坏准则和相关联的流动法则，构建了锚板上方土体破坏机制的一个运动许可速度场，并根据变分原理通过上限极限分析推导了浅埋水平条形锚板的极限抗拔力和破坏机制。分析了锚板设计参数和土体参数对极限抗拔力和破坏机制的影响，并对上限解与不同解法进行了比较。结果表明：锚板的极限抗拔力会随着埋深、初始黏聚力和土体容重的增加而增大；所提出的土体破坏机制与现有文献的试验结果相符；破坏面的形状取决于非线性参数m的大小，并且非线性参数m对极限抗拔力也有显著影响。随着参数m的增大，极限抗拔力将非线性减小，土体的破裂范围也会缩小，而破坏曲面的曲率相应增大，当m等于1时，曲面将退化为平面。上限解与现有解法和数值计算解非常接近，这表明了该方法的有效性，为锚板设计提供了一些参考。
Based on a nonlinear Mohr-Coulomb failure criterion and an associated flow rule, a kinematic admissible velocity field of failure mechanism of soil above an anchor plate was constructed, and the ultimate pullout force and failure mechanism of a shallow horizontal strip anchor plate were deduced through the upper bound limit analysis according to a variation principle. The influences of design parameters of anchor plates and soil parameters on ultimate pullout forces and failure mechanisms were analyzed, and the comparison between upper bound solution and different solutions was also conducted. The results reveal that the ultimate pullout force of an anchor plate will increase with the improvement of buried depth, initial cohesion and soil unit weight, that the failure mechanism of soil proposed is consistent with the test results of existing literatures, that the shape of failure surface depends on the magnitude of non-linear parameter m, and that non-linear parameter m also have a significant influence on the ultimate pullout force. With the improvement of parameter m, the ultimate pullout force will decrease nonlinearly, the rupture range of soil will also shrink, while the curvature of failure curved surface increases accordingly, and curved surface will degenerate into a flat surface when m is equal to 1. The upper bound solution is extremely close to existing solutions and numerical calculation solutions, which shows the effectiveness of this method, and provides some references for the design of anchor plates.