NDLI: A simplified analysis for deformation behavior of buried pipelines considering disturbance effects of underground excavation in soft clays

Content Provider	Springer Nature Link
Author	Zhang, Zhiguo Zhang, Mengxi Zhao, Qihua
Copyright Year	2015
Abstract	Underground excavation, such as tunneling and deep foundation pit, will no doubt induce the soil disturbance and have result in uneven settlements of adjacent buried pipelines which adversely affect and even damage the structures. In order to explicitly point out construction interaction mechanism and rapidly predict the structure mechanical behavior, a simplified displacement-controlled two-stage method and stress-controlled two-stage method are presented for determining the deformation behavior of pipeline structures caused by underground excavation in soil clays. According to tunneling project, the free soil deformation calculated by the displacement-controlled boundary element solution is used to estimate the soil disturbance effects of underground excavation. The oval-shaped ground deformation pattern is imposed to the tunnel opening to consider the nonuniform convergence characters. According to foundation pit project, the free soil stress based on the Mindlin solution is used to predict the soil disturbance effects of underground excavation. The situations that the excavation unloading center is not acting on the pipeline axis and that the excavation boundary and pipeline axis are formed with an arbitrary angle can fully be considered. Then, the free soil deformation and free soil stress are imposed onto existing pipelines to analyze the interaction mechanics between the disturbance soil and buried structures. The accuracy of proposed method is demonstrated with existing calculation results, centrifuge model tests, and site investigation data. In addition, the parametric analyses for the deformation influence factors of existing tunnel induced by foundation pit excavation, including the horizontal distance between the excavation boundary and tunnel axis, the tunnel buried depth, the tunnel bending stiffness, and the crossing angle between the excavation boundary and tunnel axis, are presented to demonstrate the performance of the proposed method. The results indicate that the proposed method can be used to estimate the mechanical behavior of buried pipelines considering disturbance effects of underground excavation with higher precision.
Starting Page	7771
Ending Page	7785
Page Count	15
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	10
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-01-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Underground excavation Tunneling Foundation pit Pipeline Deformation behavior Simplified analysis Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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