Search results for: Free PDF Quiz 2024 High Hit-Rate EMC D-PM-IN-23 Latest Test Report 🍂 Search for ✔ D-PM-IN-23 ️✔️ and download exam materials for free through [ www.pdfvce.com ] 🦞Questions D-PM-IN-23 Exam
-
Helical Pile Installation for Offshore Renewable Energy Exploration in Clay Seabed
Offshore wind and wave energy exploration are moving from shallow waters with fixed foundations to deep waters with floating devices. Helical pile has the potential to be used as both shallow water foundations and deep water anchors due to its ‘quiet’ installation and environmental friendliness to marine living systems. Although helical pile and/or anchor have been used extensively for onshore applications, their offshore applications need larger diameters and longer shaft than the onshore counterparts hence pose significant installation challenges. This paper presents the current studies on helical pile installation process in clay seabed. The installation of helical pile in uniform and normally consolidated clay have been studied physically in centrifuge and numerically using large deformation finite element (LDFE) analyses. Both installation torque and installation force (or crown force) were studied under different pile-soil friction coefficients and different helical pile advancement ratios (AR: ratio of pile penetration to helix pitch). Soil flow mechanisms under different ARs can explain the development of required toque and crown force during torsional pile installation. The installation torque and installation force are a function of AR and can be designed based on the capacity of installation equipment.
-
Design Of Complex Permanent Tunnel Linings At Sydney Metro’s Victoria Cross Station
The permanent tunnel linings of Victoria Cross Station include complex intersections associated with their asymmetric geometry, significant groundwater and rock loads, and the large span of the station cavern.
Victoria Cross is one of six underground railway stations recently completed by the John Holland CPB Ghella JV (JHCPBG JV) as part of the Sydney Metro City & Southwest project. Sydney Metro is Australia’s biggest public transport project, which will deliver 31 metro stations and more than 66km of new metro rail line. It runs from Sydney’s northwest region, beneath Sydney Harbour, through new CBD stations and then southwest to Bankstown.
Victoria Cross Station comprises a 265 metre long cavern with several pedestrian and service adits connecting the cavern to two adjacent shafts. Located beneath Miller Street in North Sydney, it includes the largest cavern on the project with a clear span of 24 metres and internal height of almost 16 metres.
The design of the permanent lining at the intersection between the lift access adit, lift shaft and the cavern was particularly challenging due to the complex geometry. The lift shaft intersects the crown of the cavern and connects to the access adit located above the cavern, with these two structures separated by only a 2 metre thick sandstone slab. A range of numerical modelling techniques were developed to address the various design considerations which applied to this complex intersection.
The design requirement for the station permanent lining to be tanked led to the lining having to accommodate significant groundwater loads in addition to the large rock loads associated with a cavern of this span. Three-dimensional finite element modelling was undertaken to assess the interaction between the cavern and overlying lift adit structures as well as to inform the articulation and waterproofing details at different structural interfaces.
-
Effect of ballast contamination on the behaviour of track substructure
Ballast contamination by subgrade pumping and coal contamination is understood as major cause of track deterioration in many countries over the world. As contamination clogs the ballast voids, the drainage capacity of the track is compromised. Further, lubrication caused by these fines results in reducing load bearing capacity of the ballast layer. In this study, a series of large scale hydraulic conductivity and triaxial tests were performed to study the influence of contamination of ballast on its drainage and shear strength characteristics. Drainage capacity of the contaminated track under different level of contamination was determined, undertaking a numerical analysis using Seep/W. Shear strength of coal and clay contaminated ballast at different confining pressures were compared. Bearing capacity of contaminated track, using ‘foundation under three layers’ method was derived and plotted against the degree of contamination. Subsequently, the critical level of contamination by fouling materials such as clay and coal is discussed on the basis of hydraulic conductivity, shear strength and bearing capacity of the ballast.
-
An embankment constructed using vacuum consolidation
Vacuum consolidation ground treatment has been used to facilitate timely construction of a road embankment on a 25 m thick deposit of soft to firm estuarine clay. This was the first application of the vacuum consolidation technique in Australia. This paper presents the vacuum consolidation technique, provides a summary of its construction and presents data during construction, consolidation and after decommissioning. A comparison with an adjacent embankment section constructed using the conventional surcharge and wick drain approach highlights enhanced stability obtained using vacuum consolidation.
-
Theory and experience
Some examples of geotechnical occurrences are given in this paper to show everyone between 2 and 92 years of age what an exciting profession geotechnical engineers have. The examples will also make clear that theory and experience do not exactly match in every case. To get to a better understanding of the behaviour of the soil and to match theory with experience, better communication and co-operation between scientists, contractors and clients must be established.
-
Grouting – For Groundwater Control And Mitigation Of Ground Movements
Tunnelling through soft ground or broken rock is extremely difficult; and this is exacerbated by the presence of water. Tunnelling through soft ground or beneath sensitive sediments in an urban environment may cause unacceptable ground movements that create problems for surface or near surface structures. Such problems are typically overcome by grouting. Whilst grouting may not be the answer to everything, the development of our knowledge and understanding of grouting and ground improvement has enabled us to provide better controls and allow urban tunnelling to expand.
This paper will discuss the development of grouting techniques and the application of these techniques from the author’s experience in Australia and around the world.
-
A case study of a hillside slope instability in South East Queensland
This paper describes the failure mechanism associated with multiple landslides over the east facing slopes MapletonMaleny Plateau around 80 km north of Brisbane, Queensland. High localised groundwater outflows have been observed during remedial works to these landslides which are believed to be unique to these east facing slopes as a consequence of the combination of basaltic cap and structural geology of this area. Landslides of varying scale have been noted in this area since early settlement mainly associated with colluvial soils contained within relic drainage lines that bisect the steep slopes. This case history will summarise investigative work undertaken in this area following a particularly severe period of landslide activity that followed heavy rains of January 2011 and aims to summarise observations with regard to their commonality and possibly connectivity.
-
Innovative slope engineering – Victoria – Australia
In Australia since mid 2002, the Australian Geomechanics Society has provided Geotechnical Engineers with landslide risk assessment and risk management strategies [1] and we have been involved in some significant examples of excellence in hillside engineering, applying bold investigative techniques, analytical techniques and solutions to a number of prominent residential developments within Victoria and Melbourne.
With increased affluence in our society, consumers are wishing to build their palaces in places not previously thought advisable and sometimes in relatively highly developed areas.
These developments present significant challenges to practising engineers in applying a combination of solutions and endeavouring to assign risks in accordance with the guidelines.
A number of our significant case studies are presented as a practical application of these guidelines and the way they are being interpreted by practising engineers.
Case studies and innovative solutions are presented for a site at Moreley Avenue, Wye River (South West of Melbourne – a slip area in the Otway Ranges) sites on the Mornington Peninsula South of Melbourne namely: Spindrift Avenue, Flinders (sites with a number of historical landslides and having an irregular slope of 15˚ – 45˚), Portsea (a 20 m high escarpment with a slope of 45˚ with seismic shocks originating from nearby fault in Port Philip Bay) and Nepean Highway, Frankston South (a site with a long history of slope instability with a slope of 40 degrees).