Abstract
The last half-century has witnessed a proliferation in the use of polyvinyl chloride (PVC) pipes in civil engineering applications. However, little physical data are available to date to assess conformance with performance limits of these pipes subjected to events involving localized ground subsidence. In this study, experimental results are generated and evaluated from a series of physical models involving a buried PVC pipe overlying a localized subsiding bedding zone. Ground subsidence was simulated using a precisely controlled trapdoor system positioned at mid-length of the pipe. A technique including the use of a custom-made displacement transducer was developed as part of this study to facilitate collection of continuous deflection profiles along the axis of the pipes. The progressive development of soil arching was also monitored using earth pressure sensors placed on the top, sides, and at several locations beneath the pipe, both within and beyond the zone of ground subsidence. Strains in the external wall of the pipe were also monitored. The results indicate that significant bending developed in the portion of the pipe traversing the subsidence zone, especially at the pipe crown. Beyond this point, radial deflections of the pipe cross section continued to be detected along the pipe length to distances of approximately four pipe diameters. Ground subsidence induced a severe redistribution of the earth pressures measured in the soil mass surrounding the pipe. A significant increase in vertical soil pressures beneath the pipe was captured within a distance of about one pipe diameter outside the subsidence zone. The overall response of the PVC pipe to localized ground subsidence was found to improve with increasing backfill density and decreasing soil confinement.
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Abbreviations
- A :
-
Area of pipe wall per unit length of pipe (m2/m)
- B :
-
Width of the trapdoor (m)
- C n :
-
Calibration factor
- D :
-
External diameter of the pipe (m)
- D r :
-
Soil relative density (%)
- E p :
-
Elastic modulus of pipe material (GPa)
- H :
-
Soil cover thickness above pipe crown (m)
- I p :
-
Moment of inertia of the pipe wall per unit length (m4/m)
- K :
-
Lateral earth pressure coefficient
- K a :
-
Rankine’s active earth pressure coefficient
- K kr :
-
Krynine’s earth pressure coefficient
- L :
-
Length of the trapdoor (m)
- M s :
-
Secant constrained soil modulus (MPa)
- PS:
-
Pipe stiffness (kN/m/m)
- R :
-
Radius from the center of the pipe to the centroid of the pipe profile (m)
- R H :
-
Correction factor for backfill soil geometry
- S H :
-
Hoop stiffness factor
- q :
-
External surcharge pressure (kPa)
- t :
-
Pipe wall thickness (mm)
- w :
-
Geometry coefficient (m−1)
- Δ:
-
Pipe radial deflection (%)
- ΔT :
-
Pipe total deflection (%)
- γ :
-
Soil unit weight (kN/m3)
- δ :
-
Trapdoor vertical displacement (m)
- ε :
-
Pipe wall strain
- ε bck :
-
Limit strain for buckling
- ε yc :
-
Maximum compressive strain
- ε yt :
-
Maximum service long-term tension strain
- ν s :
-
Poisson ratio of the soil
- σ h :
-
Horizontal pressure in the soil (kPa)
- σ ho :
-
Horizontal pressure prior to yielding of the buried structure (kPa)
- σ v :
-
Vertical pressure in the soil (kPa)
- σ vo :
-
Vertical pressure prior to yielding of the buried structure (kPa)
- ϕ :
-
Internal friction angle of the soil (°)
- ϕ bck :
-
Resistance factor for global buckling
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Acknowledgements
The authors express their gratitude to Prof. Benedito S. Bueno (in memoriam) for his valuable assistance in the development of this work. The authors are also thankful to the Geotechnical Engineering Department of the University of São Paulo at São Carlos, Brazil, and the Civil Engineering Department of the University of Colorado at Boulder, USA, where the first part of this investigation was conducted. Financial support to this research was provided by the Research Foundation of the State of São Paulo, Brazil (FAPESP) (Grant No. 00/09397-0).
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Costa, Y.D.J., Zornberg, J.G. & Costa, C.M.L. Physical modeling of buried PVC pipes overlying localized ground subsidence. Acta Geotech. 16, 807–825 (2021). https://doi.org/10.1007/s11440-020-01058-9
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DOI: https://doi.org/10.1007/s11440-020-01058-9