Field Tests' Study of Deviation Correction of Building near Excavation

Xi Peng,Ningxin Yang,Mi Zhou,Chiara Bedon

doi:10.1155/2021/6287388

Xi Peng, Ningxin Yang + Show 2 more

Open Access

https://doi.org/10.1155/2021/6287388

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Abstract

Deviation correction of building is a big challenge for engineers. Without powerful technique for deviation, no special guidance can be followed to conduct the deviation rectification of buildings, which brings numerous failure cases. In this study, a case study was performed to provide insight into the behavior of a special technique for deviation rectification of building near excavation. The new technique was introduced firstly, and then, the field test data, in terms of lateral displacement of wall of pit, water level deviation, and soil deformation around pile of the building, were addressed to show the performance of the function of each process and the mechanism of it. The results show that this new technique for the deviation rectification of building works very well to uplift the whole building to reach the destination position (maximum uplift = 9.71 cm) and meets the requirement of design demand, without negative effect on the adjacent excavation reported.

Highlights

Excavated foundation pits are often close to buildings in urban areas, which make a big challenge for engineers to make the safety of surrounding buildings. e deformation of support structure and surrounding ground subsidence is directly due to dewatering of the foundation pit and leads to differential settlements of the surrounding buildings
Tang et al [20], Wang et al [21], and Zhang [22] all measured the variation of the horizontal displacement of the supporting structure of foundation pit with depth due to the effect of Earth pressure in their own field tests or numerical simulations. e horizontal displacement at the midpoint of the long side of the support structure from the excavation completion of the first layer to the completion of major structure has been increasing, but the curves of the horizontal displacement at the midpoint of the long side of the support structure were measured at each time point
Field tests were conducted to study the behavior of a special technique of deviation correction of building

Summary

Introduction

Excavated foundation pits are often close to buildings in urban areas, which make a big challenge for engineers to make the safety of surrounding buildings. e deformation of support structure and surrounding ground subsidence is directly due to dewatering of the foundation pit and leads to differential settlements of the surrounding buildings. The effective stress in soil increases by the lowering groundwater level for well-point dewatering around foundation pit, and the new settlement of surrounding buildings is caused. The study of rectifying building deviation mainly includes field tests and numerical simulations. Some previous works have been conducted to utilize the uplift technique through three methods, including grouting, steel pipe pile traction, and Earth hollowing, to rectify the deviation of residential buildings and ancient temple (Jia et al [3], Zhou et al [4], Yin et al [5], and Yin et al [6]), with very effective performance obtained for these three methods. A case study of a special building deviation technique is conducted through field test monitoring, including groundwater level, horizontal displacement of adjacent soil and support structure, vertical soil displacement, and building relative tilt rate, to access the performance and mechanism of this new technique. It is found that this new technique has a significant effect on the deviation of buildings

Site Condition

Results and Discussion

Conclusions