Abstract
The primary purpose of this paper is to analyze and predict the ground settlement law of large-span rectangular shield frame bridge jacking project, to provide a reference for the optimization design and safe construction of similar projects. In this paper, combined with the jacking project of ultra-shallow buried soft soil layer rectangular shield frame bridge, through the on-site monitoring, the settlement deformation law of the longitudinal and transverse sections of the expressway pavement during the jacking construction process is discussed, and the reasons for the large settlement and rebound are analyzed. The basic laws of the road surface settlement with time are summarized. Based on the Kriging spatiotemporal prediction model, the road surface settlement is predicted. The research shows that the transverse settlement trough of the pavement caused by the rectangular shield frame bridge’s jacking construction is stable within 15 m–20 m on both sides toward the axis and symmetrical along the coordinate axis and the alignment roughly conforms to the normal distribution. The influence range of settlement trough becomes greater and greater with shield jacking, and the final settlement curve is W-shaped. After comparing the predicted curve with the measured road settlement curve, we found that the two curves are in good agreement, and the prediction result of the Kriging spatiotemporal prediction model is valid, which can reflect the process of road deformation development during the jacking process of the shield.
Highlights
In recent years, with the advancement of the new-type urbanization strategy in China, urban underground space construction has made a spurt of progress
There is not a very accurate and perfect theoretical method for predicting ground deformation in rectangular pipe jacking construction. erefore, based on the jacking project of the rectangular shield frame bridge in ultra-shallow soft soil stratum, this paper summarizes the fundamental law of pavement settlement with time by monitoring data of fieldtest section, introduces the geostatistics method, and predicts the settlement and deformation of the expressway pavement based on the Kriging spatiotemporal prediction model
Based on Kriging spatiotemporal prediction model, this paper studies the pavement settlement deformation caused by shield jacking of the rectangular shield frame bridge in ultra-shallow soft soil stratum, combined with the monitoring data of the field-test section, and draws the following conclusions: (1) rough on-site monitoring, the law of settlement and deformation of longitudinal and transverse expressway pavement sections during jacking construction is studied. e causes of a substantial settlement and local settlement rebound are analyzed, and the fundamental law of ground settlement with time is summarized
Summary
With the advancement of the new-type urbanization strategy in China, urban underground space construction has made a spurt of progress. Erefore, it is of considerable significance to study the law of soil deformation caused by jacking construction of ultrashallow buried broad cross section rectangular shield, explore the control measures of surface deformation, and maximize the protection of the surrounding environment for improving the adaptability of rectangular pipe jacking in the complex urban environment. Based on Mindlin’s displacement solution and random medium theory, Wei et al [17] consider the influence of various factors to study the vertical soil displacement caused by rectangular shield construction. Erefore, based on the jacking project of the rectangular shield frame bridge in ultra-shallow soft soil stratum, this paper summarizes the fundamental law of pavement settlement with time by monitoring data of fieldtest section, introduces the geostatistics method, and predicts the settlement and deformation of the expressway pavement based on the Kriging spatiotemporal prediction model There is not a very accurate and perfect theoretical method for predicting ground deformation in rectangular pipe jacking construction. erefore, based on the jacking project of the rectangular shield frame bridge in ultra-shallow soft soil stratum, this paper summarizes the fundamental law of pavement settlement with time by monitoring data of fieldtest section, introduces the geostatistics method, and predicts the settlement and deformation of the expressway pavement based on the Kriging spatiotemporal prediction model
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