Measured and Predicted Loads in Multi-Anchor Reinforced Soil Walls in Japan

Evaluation of Two Anchor Plate Capacity Models for Maw Systems

“…The slope of the linear regression line is about DXR/L＝0.25. Most of the MAW case study walls, for which there is load data, were constructed with anchor rod lengths of 4 m (Miyata et al, 2009). Similarly, most of the in situ anchor load tests were carried out with anchor rods of L＝4 m (Table 1).…”

“…Miyata et al (2009) compared the measured loads on these walls at the end of construction to the predicted loads using the methods recommended in BS8006 (1995) and PWRC (2002) design guidance documents and the new method proposed by the authors. The method proposed by Miyata et al (2009), for predicting anchor loads, was judged to be more accurate than the current BS8006 (1995) or PWRC (2002) methods based on the mean and the spread of the load bias statistics, for which (Miura et al 1994) load bias is deˆned as the ratio of measured to predicted anchor loads. Full-scale in situ anchor tests on MAW anchor plates embedded in the backˆll of the three above-mentioned walls have been reported by PWRC (1995), Kondo et al (1995) and Nakamura et al (1995).…”

“…The standard steel anchor plates are 300 mm by 300 mm. Miyata et al (2009Miyata et al ( , 2010) described a series of laboratory tests on walls constructed at the Public Works Research Institute (PWRI) in Japan. The test program involved three 6-m-high full-scale MAW structures constructed with diŠerent backˆll soils (MAW-1, -2 and -3).…”

Influence of Transient Flooding on Multi-Anchor Walls

“…However, for cohesive-frictional soils the predicted loads were typically twice the measured loads. Miyata et al (2009) proposed a new load equation based on back-ˆtting to measured anchor load data that was demonstrated to improve the accuracy of anchor loads on average and to…”

“…Current design methods to predict anchor loads in MAWs are based on variants of the classical tie-back wedge method (PWRC, 2002;BS8006, 1995;GeoGuide 6, 2002). Miyata et al (2009) compared measured loads from a series of eight test walls constructed at the Public Works Research Institute (PWRI) in Japan and at two other locations to predicted loads using current tie-back wedge methods. All of the test walls were tested in a dry state (i.e., not subject to ‰ooding and draining).…”