Abstract
Simultaneous leakage of soil particles and groundwater into underground vacant spaces caused by sewer pipe defects and cracks can cause underground cavities and even ground collapse on the surface. Numerical studies of this problem are limited, and the mechanism of ground subsidence caused by leakage of soil and groundwater into construction sites has yet to be verified. In this study, the factors affecting the mechanism of ground subsidence are verified via physical modelling of a sewer pipe defect. Through visual inspection and particle image velocimetry analysis, it has been found that the groundwater flow direction, hydraulic gradient around the leakage point, and strength of the ground to support itself are the main factors that dominate the mechanism of ground subsidence. These factors can affect ground deformation and cavity expansion direction, ground subsidence development and collapse speed, and occurrence of sudden ground collapse, respectively. It was also found that pore pressure fluctuates when cavity cavern collapse and cavity expansion occur.
Highlights
As an urban area grows, buried pipeline systems are required to supply water and provide drainage for the city. These pipeline systems cannot avoid ageing, and cracks can occur in the sewage pipes
The present study focuses on ground subsidence induced by causes and factors
Tests simulated cracks occurring in sewer pipes and the succession of flooding pipe leakage
Summary
As an urban area grows, buried pipeline systems are required to supply water and provide drainage for the city. Sewer sewer and and water water supply supply pipeline pipeline defects, defects, groundwater level drawdown, and excavation activity are the main causes of ground subsidence. Groundwater level drawdown, and excavation activity are the main causes of ground subsidence. Tests simulated cracks occurring in sewer pipes and the succession of flooding pipe leakage. Tests simulated cracks occurring in sewer pipes and the succession of flooding and and drainage during seasons. Vertical drainage tests were performed subsidence according to different groundwater flow modes. Vertical drainage tests were performed to simulate pipe cracks, andand water supply and drainage tests were to simulate groundwater groundwaterleakage leakagefrom fromsewer sewer pipe cracks, water supply and drainage tests performed to simulate the various possible underground soil responses.
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