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
-
Resilient Foundations: Building In Repair Capability
There is considerable literature on strategies for the repair and self-healing of concrete structures. However, in geotechnical engineering there has been much less interest in the repair of foundation elements. Typical remediation strategies involve provision of extra piles or further ground improvement. One of the approaches which is seen as promising in concrete repair is the use of bio-cements. These are solutions where bacterial actions result in the precipitation of a chemical that can act as a cementing agent. The most widely investigated of these is the use of ureolytic bacteria to precipitate calcium carbonate.
The paper provides a review of repair strategies and techniques used in concrete to encourage self-healing should damage occur. It describes the MICP process, and presents data showing how bio-cement can improve the strength and stiffness of sandy soils. Finally the paper reports results from some preliminary laboratory model tests performed to investigate the ability of bio-cement to repair cemented soil columns.
-
Slope failure mechanisms in hydraulically placed coarse sand tailings
Coarse sand tailings deposited during the mineral sands mining process can often contain varying quantities of clay and silt sized particles referred to as “slimes”. When placed hydraulically, these slimes can become trapped, resulting in pockets or lenses of sand-slime mixtures within the quartz sand tailings.
Extensive mineral sands deposits exist in Western Australia. The case study for this paper is an active mineral sands mine located north of Perth. Minor slope failures resulting from hydraulically placed coarse sand tailings are not uncommon and have been experienced in the past. Recorded failures at the site have typically occurred beneath pond level or at the overburden tip face resulting in recession of the tailings beach and ground heave at the toe of the tip face. Despite being problematic, these types of failures are not of sufficient magnitude to affect day to day operations and present no risk to employees’ safety.
This paper looks at the effect of these sand-slimes mixtures and the mechanisms responsible for triggering a massive slope failure vastly different to previous failures observed in this type of mining operation. The control measures implemented to reduce risk and minimise the possibility of this type of failure occurring again in the future are also discussed.
-
Case study: Assessment of the shaft capacity of a driven pile in sand using CPT based methods
A number of CPT-based pile capacity prediction methods have recently been presented that claim to take friction fatigue into account. These methods were used to assess the shaft capacity of a 1.54m diameter steel tubular pile, driven to 40m depth, which showed substantial friction fatigue during driving. All of the methods over-predicted the shaft capacity at the end of drive. After a 34 day period to allow the pile to set-up, the NGI and UWA methods were found to most closely predict the shaft capacity inferred from a dynamic restrike test. The ICP method also produced similar results when an exponent of -0.5 for driven piles was used on the h/D ratio instead of -0.38.
-
Geotechnical and Geological Engineering for the Nakheel Tower, Dubai
Dr Chris Haberfield
-
Powering Pile Design through Parametrics
Parametric design skills are increasingly in demand within the engineering consulting industry due to ever-pressing time and budget constraints on medium- to large-scale infrastructure projects. The structural engineering team at Arup examined obstacles and manual processes encountered by the team during the design of a piled noise wall and endeavoured to automate, or at-least streamline, many of them. This resulted in a 94% saving in pile cross- sectional analysis computation time compared to manually inputting pile cross-section and design actions into analysis software and designing the pile using spreadsheets. The team’s skills in parametric design in Grasshopper, a parametric modelling tool, and basic scripting were leveraged and developed throughout the process, providing an essential way of designing. The pile design process was selected to demonstrate the benefits of the parametric design due to it being a common design task on major infrastructure projects, such as pile wall design. The tool was developed with the intent of it being modular, employing a plug-and-play approach that connected the key stages of the design process with outputs, such as embodied carbon calculations and engineering drawings. McNeel Rhino, a 3D visualisation software, and Grasshopper were chosen for the tool development as they provided a user-friendly, visual programming interface and many plug-ins to existing automation workflows. Thus, enabling the engineer to interrogate the output of each stage of the design process both visually and numerically. The modular approach also enabled engineers to substitute ALP in place of Brom’s calculation, as the design progresses.
-
Report on the Fourth International Symposium on Landslides, ISL – 1984
The fourth International Symposium on Landslides washeld on Toronto, Canada from September 16-22, 1984. The first day was designated as Canada Day and keynote lectures were given on Landslide problems in the different regions of Canada. From Tuesday to Friday (September 17 to 22) the International meeting covered the following topics (1) Climatic and Groundwater Aspects of Landslides (2) Slope Movements in Hard Rocks (3) Slope Movements in Weathered Rocks (4) Landslides in Heavily Over- consolidated Clays and Soft Rocks (5) Landslides in Soft Clays (6) Landslides in Silts, Sands and Loess Including Subaqueous Slides (7) Recent Developments in Landslide Studies: Analytical and Probabilistic Methods (8) Landslide Risk Mapping (9) Instrumentation and Slide Warning Systems. State-of-the-Art lecturers were selected from U.S.A., France, Hong Kong, Australia, Peru, Japan, Canada, U.K., Switzerland, Norway, Sweden and India.
Dr R.N. Chowdhury, the only such invited speaker from Australia, presented his State-of-the-Art Report on ‘Recent Developments in Landslide Studies – Probabilistic Methods’. The paper was well received and considerable interest is being shown by geotechnical engineers in this new trend i.e. use of probabilistic methods in slope engineering. There is an urgent need for the application of probabilistic methods to practical problems involving risk assessment. Relatively simple approaches need to be developed to assist engineers who are not yet exposed to probabilistic methodology.
-
“Granular Pavements — Geomechanics’ Lost Child”
The central theme of this paper is that pavement technology is without a behavioural model for unbound granular pavements. Some very weighty questions about transport efficiency, load limits and pavement asset protection cannot be addressed because of this. It is argued that the basis for a suitable model is likely to be found within geomechanics. The paper gives a brief summary of current design methods and of the conventional understanding of pavement behaviour and as well provides insights into alternative understandings of material behaviour and appropriate directions for pavement research.
-
Factors Influencing Shear Strength And Slope Failures In Basalt Soils Of North Eastern New South Wales
Landslides are a common feature of the basalt terrain or north eastern New South Wales. Failures typically occur through residual soil layers, at strength between the peak soil substance strength, and typical residual strength values. Shear strength on soil fissures approach residual strength. Failure therefore seems to occur through a combination of turbulent or rolling shear of the soil substance and sliding shear on fissure surfaces. Fissure properties such as surface condition continuity, spacing and orientation need to be observed when investigating sites in the area, or in similar geological terrains to allow consideration of the likely influence on overall soil mass strength.
-
The Development and Application of Grouting and Ground Treatment
Grouting and ground treatment is the application of engineering practices to provide improvement to the ground. These practices have been developed over the last 200 years. This paper will look at the development of these techniques and some of their recent application to the success of major engineering projects.