Laterally Loaded Shaft Group Capacities and Deflections behind an MSE Wall

Pierson, Matthew C.; Parsons, Robert L.; Han, Jie; Brennan, James J.

doi:10.1061/(asce)gt.1943-5606.0000496

Cited by 19 publications

(3 citation statements)

References 8 publications

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“…The minimum spacing for shaft groups with different backfill modulus constants was determined by enlarging the spacing until the load difference between the group shaft and the single shaft cases was less than 10% when the deflection was 50 mm. This approach is similar to that used by Pierson et al (2011) to find the minimum spacing. The minimum spacing to avoid the group effect is plotted against the modulus in Figure 10, in which the vertical axis is normalised by the minimum spacing calculated from Equation 9, and the horizontal axis is normalised by the modulus constant of the baseline case.…”

Section: Further Study On Group Effectmentioning

confidence: 94%

“…usually less than 50 mm). Pierson et al (2011) proposed a formula to estimate the minimum spacing between drilled shafts to avoid the group effect, based on field tests. This considered only the influence of the shaft distance from the MSE wall, as shown in Equation 9…”

Section: Further Study On Group Effectmentioning

confidence: 99%

“…Clearly, the influence of the modulus on the minimum spacing can be deemed linear. Since the baseline case contains the material properties of the field study of Pierson et al (2011), a modifier, F m , can be applied directly to Equation 9 to account for the modulus effect on the minimum spacing, as shown in Equation 10.…”

Section: Further Study On Group Effectmentioning

confidence: 99%

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Modelling of laterally loaded drilled shaft group in mechanically stabilised earth wall

Huang¹,

Han

Rahman

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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This paper proposes a numerical model, calibrated by a full-scale field test, to investigate the behaviour of a laterally loaded shaft group built within a mechanically stabilised earth wall. The numerical modelling yielded results of the geogrid strain and the lateral earth pressure distributions. It was found that the strain was a maximum at the edge of the each shaft, and decreased rapidly with distance from the shaft. The additional lateral earth pressure induced by the shaft group is non-linear and non-monotonic. The calibrated numerical model was then used to investigate the impacts of various factors on the group effect. It was found that the required minimum spacing to avoid group effect increased with decreasing modulus of the backfill material. The friction angle of the backfill material and the geogrid tensile stiffness did not have a significant influence on the group effect. Based on this study, a formula to estimate the minimum spacing to avoid group effect was developed.

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Section: Further Study On Group Effectmentioning

confidence: 94%

Section: Further Study On Group Effectmentioning

confidence: 99%