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
-
Physical modelling of soft clay using Vacuum-Surcharge Method
In this paper, the large-scale consolidation apparatus was employed to investigate the performance of vacuum preloading with conventional surcharge loading. Several tests were conducted to examine the effect of a vacuum and associated parameters such as smear zone and soil permeability characteristics. The measured settlement and excess pore pressure indicates that the vacuum application has certain benefits to control excess pore pressure for a given total loading application. The analytical modelling for radial consolidation and vacuum preloading considering both variation of soil compressibility and permeability was employed to predict the soil consolidation behaviour. It is shown that the analytical model can reasonably capture the laboratory behaviour.
-
Numerical modelling of a full scale reinforced embankment on deep mixing cement piles
Finite element modeling using PLAXIS software of a full scale reinforced embankment on clay-cement deep mixing (DMM) piles foundation have been carried out based on the observation of its performance over more than one year. In order to investigate the appropriate consolidation and deformation parameters of the improved foundation, back analysis of the embankment has been done with particular attention given to the actual monitored vertical settlements, excess pore water pressures and horizontal displacements. Good agreement between the predicted and observed data has been obtained with the ratio of the permeability of clay-cement pile over that of surrounding untreated clay, kpile/ksoil of 10 and the modulus of the clay-cement material of 50 MPa, which is about 135 times the undrained shear strength of the clay-cement piles.
-
Foundation Investigation In Weak Slaking Rock, Darwin, Australia
Most of the Darwin CBD is underlain by a Mesozoic rock locally termed porcellanite. Much of this is a silcrete which can be up to 8 m thick and is typically high to very high strength. Many of Darwin’s buildings are supported on shallow footings founded on porcellanite and there is little available geotechnical information of relevance to foundation design in the weathered Proterozoic phyllite underlying the porcellanite.
This paper describes a foundation investigation and design for a 34 storey building with sunken lift core in Darwin which, when complete will be the tallest in that city. Preliminary footing design by others was based on the precedent of shallow footings supported in the porcellanite. A preliminary geotechnical investigation (by others) comprising boreholes to a depth of about 15 m, indicated that a significant thickness of porcellanite underlies only part of the site and that footings would need to be supported on older deeply weathered phyllite or a thin layer of porcellanite overlying phyllite. Based on low soil stiffness properties estimated mainly on the basis of low SPT ‘N’ values large diameter deep bored piles were proposed as a means of reducing differential settlement.
To further investigate the proposed footing solution options, a supplementary geotechnical investigation was undertaken to obtain estimates of the engineering properties of the phyllite. Diamond core drilling with pressuremeter testing was undertaken. However core recovery was poor and the results of the pressuremeter testing were affected by the slaking of the phyllite. The stiffness of the phyllite was subsequently estimated using dynamic load testing of precast concrete piles placed into pre-drilled sockets at select depths. Analyses using the estimated stiffness properties of the phyllite suggested that differential settlements could be kept within acceptable limits using a shallow footing solution, which was subsequently adopted. The footing system has since been constructed and construction is near completion. Settlement monitoring indicates settlements less than design predictions.
-
Behaviour of concrete-filled glass fiber reinforced composite model piles under lateral loads
Pile foundations serve as one of the most important structural components in the design and construction of off-shore and on-shore facilities such as oil-rig platforms, jetties and naval bases. Conventional piling materials such as concrete, steel and timber deteriorate in the marine environment and in corrosive soils. Recently the use of fiber reinforced polymer (FRP) wraps has become quite apparent as repair materials to rehabilitate piles in such conditions. Millions of dollars are spent each year to carry out these rehabilitation works or to replace damaged piles. FRP composites are used in a wide range of structural applications where high strength, corrosion resistance and long term durability are of primary importance in harsh operating environments. Glass fiber reinforced polymer (GFRP) composite piles could therefore be a possible alternative to overcome the continuous degradation of conventional piles. The present study incorporates an experimental investigation of the lateral load capacity of GFRP composite piles. The results indicate that GFRP composite piles can carry a higher load compared to concrete plies.
-
Three-dimensional geometric modelling for the construction of the north-west corner of the Port Botany Expansion Project
The Port Botany Expansion (PBE) project involves the construction of an extension to the existing port in Botany Bay, Sydney. A new Tug Berth is located in the North-West corner of this port expansion, and provides berthing for tug vessels associated with the operation of the port. The design and construction of this berth and the North-West corner of the PBE project was heavily constrained by the geometric requirements of the project. This geometric complexity posed significant challenges in the staging of construction. As a consequence, three dimensional (3D) construction staging models were developed by the design team to assist in knowledge transfer through the construction process. The modelling process also allowed for greater efficiency by minimising dredge volumes, and the application of quality controls throughout construction. This paper discusses the development of these staging models, and the benefits that were seen on the project as a result. It also presents some lessons learnt through the design and construction process which could be beneficial for similar future projects.
-
Development of a residential estate affected by landslide, Shire of Yarra Ranges
In the mid-1980s, development of a residential estate in the Shire of Yarra Ranges (SOYR), to the east of Melbourne was halted after landslides were identified near the site and a batter failed during excavation for a court bowl. In the late 1980s, SOYR commissioned Shire-wide geotechnical studies to assess and manage landslide risk. These studies indicated that parts of the estate previously quarantined from development could possibly be released for development. In 2003, SOYR commissioned further geotechnical works to assess development options. These works led to the release of parts of the estate for development.
The estate is underlain by Tertiary age Older Volcanics, an important geological unit with respect to landslide in eastern Melbourne. This case study outlines the risk assessment (to AGS 2000 guidelines) undertaken following the 2003 geotechnical investigation, along with relevant background information including the landslide history of the site, SOYR planning controls and the general landslide characteristics of the Older Volcanics geological unit.
-
Rehabilitation of an uncontrolled landfill site for residential development
The project site was originally part of a wetland on the Swan Coastal Plain and subsequently utilised as a market garden. The site was then excavated for peat, and filled with over 120,000 m3 of uncontrolled landfill, predominantly building materials. In April 2004 a geotechnical investigation of the site indicated that about 50% of the landfill material was sand and about 30-40% was concrete and brick fragments. This paper presents an innovative rehabilitation methodology successfully employed at the site, which retained over 80% of the uncontrolled fill material. This was achieved through the re-use of the sand fraction and reclamation of the brick and concrete fragments to form rock fill. Subaqueous placement of rock fill material eliminated the need for dewatering, which might have impacted nearby wetlands and adjacent buildings.
-
Happy Soil Mechanics Father’s Day 2024 – Celebrating Karl Terzaghi’s Birthday
Ground truth, control and design of driven piles: implementing old ways with a new twist