Numerical evaluation of the dynamic response of pipelines to vibrations induced by the operation of a pavement breaker |
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| Institution: | 1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu, China;2. College of civil Engineering, Hunan University, Changsha 410082, Hunan, China;3. Jiangsu Institute of Building Science, Jiangsu Testing Center For Quality of Construction Engineering, Nanjing 210098, Jiangsu, China;1. Department of Civil Engineering, University of Coimbra, Coimbra, Portugal;2. Institute of Construction and Architecture, Slovak Academy of Sciences, 84503 Bratislava, Slovakia;1. Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, United Kingdom;2. Department of Civil Engineering, University of Bristol, Bristol BS8 1TH, United Kingdom |
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| Abstract: | This paper studies the response of pipelines to vibrations induced by the operation of a pavement breaker during the rehabilitation of concrete pavements. An efficient two-and-a-half-dimensional (2.5D) formulation is employed, where the geometry of the structure and the soil is assumed to be invariant in the longitudinal direction, allowing for a Fourier transform of the longitudinal coordinate y along the structure to the wavenumber ky. The dynamic soil–structure interaction problem is solved by means of a 2.5D coupled finite element–boundary element (FE–BE) method using a subdomain formulation. The numerical model is verified by means of results available in the literature for a buried pipeline subjected to incident P- and SV-waves with an arbitrary angle of incidence. The presented methodology is capable to incorporate any type of incident wave field induced by earthquakes, construction activities, traffic, explosions or industrial activities. The risk of damage to a high pressure steel natural gas pipeline and a concrete sewer pipe due to the operation of a pavement breaker is assessed by means of the 2.5D coupled FE–BE methodology. It is observed that the stresses in the steel pipeline due to the operation of the pavement breaker are much lower than those induced by the operating internal pressure. The steel pipeline behaves in the linear elastic range under the combined effect of the loadings, indicating that damage to steel pipelines close to the road due to the operation of a pavement breaker is unlikely. The maximum principal stress in the concrete pipe, on the other hand, remains only slightly lower than the specified tensile strength. The decision to use a pavement breaker should hence be taken with care, as its operation may induce tensile stresses in concrete sewer pipes which are of the same order of magnitude as the tensile strength of the concrete. Assessing the risk of damage by means of vibration guidelines based on the peak particle velocity (PPV) gives, for the particular cases considered, qualitatively similar results. |
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