Measured and Predicted Loads in Multi-Anchor Reinforced Soil Walls in Japan
Measured and Predicted Loads in Multi-Anchor Reinforced Soil Walls in Japan
复制标题
日本多锚加筋土墙的荷载实测和预测
DOI：
10.3208/sandf.49.1
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发表时间：
2009
影响因子：
3.7
通讯作者：
T. Konami
中科院分区：
文献类型：
--
作者：
Y. Miyata;R. Bathurst;T. Konami
摘要在过去的十年里，日本已经建造了3000多座多锚墙。本文简要回顾了总共8个可用于估算施工结束时锚固荷载的仪器化墙体截面。使用当前设计指南中的公式将测量的载荷与预测值进行比较。结果表明，对于摩擦填土墙体，只要采用朗肯公式计算Ka，日本和英国现行的锚固荷载计算方法是相当准确的。对于粘结-摩擦回填的墙，目前的设计方法对锚固荷载的预测高达两倍之多。目前英国和香港的设计方法中的偏心项并没有提高负荷预测的精度，建议从这些公式中去除这种额外的复杂性。提出了一种新的荷载方程，并对实测的锚固荷载数据进行了常系数回归。新方法基于荷载偏差值的统计，根据施工结束时锚固荷载的实测值与预测值的比率计算出的荷载偏差值，在定量上给出了更好的锚固荷载预测。
ABSTRACT More than 3000 multi-anchor walls have been built in Japan over the last decade. The paper briefly reviews a total of eight instrumented wall sections that can be used to estimate anchor loads at the end of construction. Measured loads are compared to predicted values using equations found in current design guidelines. The comparison shows that the current Japanese and UK design methods to compute anchor loads are reasonably accurate for walls with frictional backfills provided Ka is calculated using the Rankine equation. For walls with cohesive-frictional backfills, current design methods over-predict anchor loads by as much as a factor of two. The eccentricity term in current UK and Hong Kong design methods is shown to not improve the accuracy of load predictions and it is recommended that this additional complexity be removed from these equations. A new load equation is proposed and constant coefficients are back-fitted to measured anchor load data. The new method is demonstrated to give quantitatively better predictions of anchor loads based on the statistics for load bias values computed as the ratio of measured to predicted anchor loads at the end of construction.