Elaborate numerical analysis and new fibre Bragg grating monitoring methods for the ground pressure in shallow large-diameter shield tunnels: a case study of the yellow crane tower tunnel project
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Abstract
The determination of ground pressure is an important prerequisite for the design load of tunnel. Currently, in the emerging field of shallow rock large diameter shield tunnels, the study of ground pressure is limited by the lack of comprehensive engineering case studies and experimental data. This study provides a comparison of elaborate numerical analysis method and Fibre Bragg Grating (FBG) monitoring method for the ground pressure in a shallow rock large-diameter shield tunnel based on a case study. Firstly, the elaborate 3D numerical model is developed by finite difference software to simulate the process of shield tunnelling. Construction details such as the force distribution, liner application, over-excavation gap and shield tail gap are considered in the simulation process. The elaborate numerical analysis method for the ground pressure in shallow rock large-diameter shield tunnels is presented. Then, using the elaborate numerical analysis method, the impact of key parameters such as support force at the tunnel face, grouting pressure, tunnel diameter, and tunnel depth on ground pressure are assessed. The new FBG monitoring method is developed to measure ground pressure in shallow rock large-diameter tunnel. Finally, the ground pressure obtained by the elaborate numerical analysis method is compared with that obtained by the new FBG monitoring method. The result shows that the elaborate numerical analysis method is generally larger than the new FBG monitoring method, with a reasonable 15% difference. The ground pressure that obtained by FBG monitoring shows the initial rapid increase, followed by gradual increase, eventually stabilising.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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