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Modelling the excavation of elliptical shafts in the geotechnical centrifuge
| Content Provider | Scilit |
|---|---|
| Author | Faustin, N. E. Elshafie, M. Z. E. B. Mair, R. J. |
| Copyright Year | 2018 |
| Description | Book Name: Physical Modelling in Geotechnics |
| Abstract | Vertical shafts are an essential component of tunnelling projects in urban environments and elliptical plan geometries are sometimes constructed. However, little is known about the performance of elliptical shafts and the associated adjacent ground movement during excavation; centrifuge testing of elliptical shaft excavation can provide valuable insight. Traditionally, excavation simulations in centrifuge testing mainly rely on the use of heavy fluid which is drained in-flight. This method assumes that the horizontal stress changes within the excavation are equal to the vertical stress changes which may not be the case in reality. More realistic stress changes could be achieved by carefully extracting sand from the centre of an elliptical shaft during excavation. This paper describes such centrifuge tests conducted at Cambridge University. The centrifuge model and the mechanism developed to excavate the shaft in-flight are described. Measurements are presented for strains in the elliptical shaft lining and associated ground displacements. This chapter describes such centrifuge tests conducted at Cambridge University. The centrifuge model and the mechanism developed to excavate the shaft in-flight are described. Vertical shafts are an essential component of tunnelling projects in urban environments and elliptical plan geometries are sometimes constructed. However, little is known about the performance of elliptical shafts and the associated adjacent ground movement during excavation; centrifuge testing of elliptical shaft excavation can provide valuable insight. The chapter describes the development of small-scale centrifuge model tests, conducted at Cambridge University, to investigate the behaviour of elliptical shaft linings and the adjacent ground during excavation. Centrifuge testing of an elliptical shaft excavation in dense Leighton Buzzard Fraction E sand was carried out using the 10 m beam centrifuge at Cambridge University. The test results showed that both hoop stresses and in-plane bending stresses developed in the elliptical shaft lining to resist in-situ horizontal soil stresses. |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2018-0-86960-X&isbn=9780429438646&doi=10.1201/9780429438646-3&format=pdf |
| Ending Page | 796 |
| Page Count | 6 |
| Starting Page | 791 |
| DOI | 10.1201/9780429438646-3 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Stress Model Centrifuge Testing Shaft Excavation Elliptical Shaft Testing of Elliptical |
| Content Type | Text |
| Resource Type | Chapter |
