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Design and construction of retaining structures for Lane Cove tunnel
The Lane Cove Tunnel in Sydney connects the M2 Motorway at North Ryde with the Gore Hill Freeway and the Pacific Highway at Artarmon. Design and construction involved about 70 retaining structures which included braced and anchored bored pile walls, soil nailing, reinforced soil wall systems and post-tensioned cantilever walls. Significant challenges related to restricted site access, the need to minimise construction impacts and a tight design schedule.
Rigorous assessment of the effects of new construction on existing structures and construction safety utilised advanced numerical techniques to model ground-structure interaction. This paper discusses various geotechnical issues affecting design and construction, how the design was implemented in the field and documents results of performance monitoring.
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Capabilities of saltflow and Pde2d in modelling saltwater intrusion in coastal Australian lowlands
Saline intrusion has the potential to cause a number of difficulties for coastal lowlands around Australia but the negative impacts of salt intrusion is not observed in the short to medium term. In order to plan for the longer term, researchers need to accurately map the saltwater distribution in the coastline. However, an appropriate finite element solver must be selected that can allow for complexities in representing the domain and boundary conditions. Saltflow and Pde2d are two such packages studied here. A 2D mathematical coupled salinity intrusion model is solved using these packages. The performances of the packages are analysed in terms of ease of use, accuracy of simulations and capacity to represent physical processes related to the boundary conditions. Problems fundamental to the saltwater literature are solved and solutions compared under different demands states. The accuracy of simulations was compared with a semi analytical solution. Although Saltflow was favoured for solving saltwater intrusion in coastal Australian lowlands, the comparison generally highlighted several user difficulties in saltwater intrusion modelling.
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Technical Note On The Interpretation Of Deep Fill Creep Settlement Monitoring Data
This technical note discusses the interpretation of settlement monitoring data for deep fill to assess long term creep settlement characteristics. Some general principles are discussed, and previously published settlement data is updated.
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Performance Assessment Of Cut Off Walls Subject To Tidal Variation
Cut off walls constructed in coastal settings are subject to external tidal variations in water pressure. A method to exploit this tidal variability to check the performance of cut-off wall construction is presented supported by analytical and numerical modelling results. The method described allows progressive assessment of performance of the wall during its construction. The approach is illustrated with reference to two case studies: one for a major building project and the other for an environmental control measure.
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Investigation And Monitoring Of A Slow Moving Landslide
An area in the township of Clifton Springs called The Dell is a prominent coastal amphitheatre feature of the Bellarine Peninsula in southern Victoria. The local community and visitors to the area have used the Dell as a safe access point to Corio Bay and for its recreational facilities.
The Dell is located within the area previously utilised as a Hotel Resort in the late 1890’s until the 1920’s. The groundwater springs, after which the township of Clifton Springs is named, emerge at the foreshore. The mineral springs have been known and utilised dating back to the early 1800’s. Development of the springs and a hotel resort was constructed in the 1870’s.
A long and continuous tension crack near the crest of the amphitheatre developed during the latter months of 2001 and has since increased in length and width. Visually observed acceleration of slope movements prompted the authorities to close and seal off the area.
The slow moving landslide has since been subject to geotechnical and hydrogeological investigation and monitoring of ground movements, surface movements and pore water pressures.
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Performance Of A Pile-supported Highway Embankment Over Soft Ground Reinforced With Geosynthetics
In this paper, a case history of a geosynthetic reinforced pile-supported embankment over soft clay is numerically simulated using a fully coupled finite element analysis. Field monitored data for pressures transferred from the embankment to the piles and soft foundation soil, excess pore pressures, settlements of piles and soil, and lateral deformations are compared with results from the finite element analysis. Results show that a significant amount of embankment load is carried by the piles and hence the excess pore pressures generated in the foundation soil are remarkably low. Although lateral effects are not usually incorporated in design methods used in current practice, results show that they are significant closer to the toe of the embankment.
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Geotechnical Stability Analysis
51st Rankine Lecture
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Foundations (piles) in Rock-Serviceability Rules
E.H. Davis Lecture 2007