INHIBITORY EFFECT OF GROUND IMPROVEMENT ON THE SETTLEMENT OF THE LEANING PAGODA

Authors

  • Yuko Ishida Department of Technological Systems, Osaka Prefecture University Colledge of Technology, Japan
  • Hajime Ito JIP Techno Science Corporation., Japan
  • Ryoichi Fukagawa Faculty of Science and Engineering, Ritsumeikan University, Japan

Keywords:

Differential settlement, Consolidation analysis, Ground improvement, Deterioration of brick

Abstract

The Wat Krasai pagoda in Ayutthaya, Thailand, leans mainly toward the north. Soft clay
sediments of foundation ground and the deterioration of the bricks and mortar that compose the pagoda are the
main causes of the pagoda’s deformation. In 2013, the surface of the lower part of the pagoda was restored and
the base was reconstructed using new bricks. Since 2014, field surveys were conducted twice a year and we
confirmed that there are cracks and irregularities in the reconstructed structures in addition to a gap between
the reconstructed base and the pagoda at the southside. Based on the measurement of the inclination and our
surveys, we deduced that the pagoda has been continuously sinking toward the north and this settlement will
continue in the future. In this study, ground improvement was proposed as a countermeasure for differential
settlement and the settlement inhibitory effect of the ground improvement was evaluated through a numerical
simulation. The results of the analysis indicated that the weight of the bricks installed during the restoration in
2013 exacerbated the settlement and inclination of the pagoda. Additionally, ground improvement has an
inhibitory effect on settlement, and the rapid restoration-induced settlement was found to decrease in the case
where ground improvement was conducted from the surface of the ground to the bottom of the second soft clay
layer. The restoration work of historical brickwork buildings that need additional bricks should therefore
consider the possibility and consequences of settlement owing to its new weight.

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Published

2021-03-28

How to Cite

Yuko Ishida, Hajime Ito, & Ryoichi Fukagawa. (2021). INHIBITORY EFFECT OF GROUND IMPROVEMENT ON THE SETTLEMENT OF THE LEANING PAGODA. GEOMATE Journal, 20(79), 111–118. Retrieved from https://geomatejournal.com/geomate/article/view/236