Abstract
Settlement of a relatively small magnitude occurs in box structures supported by pile foundations. However, if cavities are generated under the box structure, ground settlement can be accelerated by surrounding soil entering the cavities. In order for the structure to maintain stability for a long period of time, sustainable development to maintain the stability of the building must be continued. Preventing rapid ground settlement can lead to long-term structural stability and prevent the occurrence of life-threatening damage, thereby helping to maintain and build a sustainable urban infrastructure. Thus, in this study, a soil flow protector (SFP) that can be easily installed on the sides of the structure was developed to mitigate the aforementioned problem. Field tests and numerical analysis were performed to investigate the effect of SFP installation on structural stability and settlement reduction. After performing field experiments, it was found that SFP installation could reduce ground settlement and ground horizontal displacement. Moreover, for a 79.9-mm settlement, the safety factor was 1.315, which remained stable even when the settlement reached 345 mm. Hence, the developed SFP can be used to reduce soft ground settlement affecting box structures supported by pile foundations.
Highlights
Box culverts, which present a similar structure to that of abutments, generally serve as connection elements between roads and between roads and bridges
To prevent and reduce the problems caused by cavity formation under structures supported by pile foundations, a soil flow protector (SFP) that can be installed on the side of the structure has been developed and is presented
It was concluded that the developed SFP is suitable for reducing soft ground settlement caused by cavity formation under box structures supported by pile foundations
Summary
Box culverts, which present a similar structure to that of abutments, generally serve as connection elements between roads and between roads and bridges. To prevent and reduce the problems caused by cavity formation under structures supported by pile foundations, a soil flow protector (SFP) that can be installed on the side of the structure has been developed and is presented . An SFP was installed on the side of a box structure supported by a pile foundation on soft ground, and a field test was performed. Numerical analysis was performed using a commercial program, Plaxis 2D, to simulate a field test and back analysis From these results, the behavior of the ground on which the SFP was installed was analyzed. It was concluded that the developed SFP is suitable for reducing soft ground settlement caused by cavity formation under box structures supported by pile foundations
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