Integrity Testing of Pile Cover Using Distributed Fibre Optic Sensing.
作者： Yi Rui , Cedric Kechavarzi , Frank O’Leary , Chris Barker , Duncan Nicholson
DOI: 10.3390/S17122949
关键词: Soil thermal properties 、 Optical fiber 、 Pile 、 Geology 、 Concrete cover 、 Heat transfer 、 Thermal 、 Geotechnical engineering 、 Parametric statistics 、 Finite element method
摘要: The integrity of cast-in-place foundation piles is a major concern in geotechnical engineering. In this study, distributed fibre optic sensing (DFOS) cables, embedded pile during concreting, are used to measure the changes concrete curing temperature profile infer cover thickness through modelling heat transfer processes within and adjacent ground. A field trial was conducted at high-rise building construction site London 51 m long test pile. DFOS cables were attached reinforcement cage four different axial directions obtain change data along monitoring shows clear development hydration with time pattern varies due small cover. one-dimensional axisymmetric finite element (FE) model estimate geometry depth by back analysing data. results show that estimated diameter range between 1.40 1.56 for instrumented This average compares well obtained standard Thermal Integrity Profiling (TIP) method. parametric study examine sensitivity soil thermal properties on estimating geometry.
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