Abstract
In order to create more underground space, it was important to investigate the impact of excavation on the preexisting building. In this paper, a scale model test was conducted to analyze the stability of the structure during excavation. The model consisted of underpinning piles preinstalled in clay, with a reinforced concrete building placed on underpinning piles. The strain and settlement of the structure were observed to reveal the time settlement of columns and the time strain of beams, columns, and piles during excavation. The results showed that the strain change of beams was small, and strain values of columns were getting higher. And underpinning piles had great strain variations. They were of great significance to underpinning design and engineering practice.
Highlights
During the last few decades, the needs for underground space had raised in downtown
Underpinning and excavation would help to expand the underground space without affecting the daily use of the building
Some underpinning methods based on the underground construction were widely adopted in many countries [5,6,7,8,9,10]
Summary
During the last few decades, the needs for underground space had raised in downtown. Making the underground space beneath a preexisting building can be an effective solution. Based on scale model test and cases, underground underpinning technology had made progress in Japan [2,3,4]. Several valuable conclusions of underpinning technology based on scale model experiment were achieved in recent years. E behavior of underpinning piles was found based on a real case in China, which included axial-loading and excavation-unloading responses of piles [17]. Investigating the behavior of piles and the preexisting structure in cases might bring up several unsolvable problems during excavation. Advances in Civil Engineering this engineering problem, but most of the scale model tests only focused on the influence of adjacent buildings during excavation [18,19,20,21]. A small-scale indoor physical model test was conducted to simulate the underpinning and excavation beneath the preexisting foundation. Observations included columns settlement, and strain changes of columns, beams, and piles. is offered an opportunity to study the stability of the preexisting structure and the behavior of micropiles as a result of soil stress relief. e paper focused on strain changes of the preexisting structure and vertical displacements of columns during excavation
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