Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)
Method for Assessing Damage Induced in Utilities Due to Ground Movements from Major Infrastructure Projects
Francesc Mirada, Geotechnical Engineer, Riccardo Impiumi, Geotechnical Engineer and Zeena Farook, Geotechnical Engineer
Geotechnical Engineers are faced with huge challenges in predicting the movements caused by tunnelling and excavations and their impacts on utilities. Furthermore the number of parties involved in infrastructure projects often requires multiple iterations to come to a common solution, making the analyses very labour intensive, locking resources and budget from other parts the project. The ground movement induced in utilities due to major infrastructure projects is to be assessed by means of the Oasys software Xdisp. The stakeholders comprise various utilities providers, each with unique criteria and a variety of asset dimensions to be assessed. Ground movements generated by three phases of works (demolition of buildings, installation of temporary and permanent retaining walls, excavation behind the walls and tunnelling) are calculated using a combination of Oasys Pdisp and Xdisp. Displacements are calculated for each phase and imported in the subsequent phase, for the utility assessment to be undertaken. Asset information provided in GIS format, which included the geo-referenced position of the asset, function, dimensions and material in order to identify the limiting criteria to be applied. Due to the number of assets and expected iteration typical of this kind of analysis a fluid solution consisting of tailoring the software XDisp to adapt it to the requirements of the different asset holders is adopted. The output can then be manipulated with a relatively sophisticated geospatial process for direct input in GIS for improved settlement visualisation based on strain and displacement set criteria. It is estimated the process can save up to 60% of the computing time, based on size of the project, compared to standard methods of calculation using the same software.
|article #3031; publication #1040 (ROME-2018)|