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
-
Dem Simulations Of Liquefaction And Postliquefaction Behaviour Of Granular Materials
This paper illustrates the potential of DEM simulations to capture the behaviour of liquefaction and post liquefaction behaviour of granular materials. A series of strain controlled undrained cyclic triaxial test has been carried out on isotropically compressed assembly of spheres. The undrained tests have been simulated by maintaining a constant volume condition of the sample throughout the cyclic triaxial tests. The pore water pressure has been computed considering the difference of mean pressure between the undrained (effective) and drained (total) stress path during strain controlled cyclic triaxial tests. As observed from the results, numerical simulation using DEM has captured liquefaction and pore water pressure generation and post liquefaction behaviour very similar to the experimental results. Further, evolution of micromechanical parameters such as average coordination number during cyclic triaxial loading has also been reported and discussed.
-
Engineering characterisation of in situ foamed bitumen stabilised pavements
This report is the second of two papers that reviews the results of research undertaken into the stiffness and fatigue performance of in situ foamed bitumen stabilised pavement materials at various sites in the Cities of Canning and Gosnells in Western Australia. In the first paper “The development of a fatigue transfer function for In situ Foamed Bitumen Stabilised Pavements,” the authors reported a review of laboratory fatigue testing that was undertaken over a 13 year history.
In this paper, a review of recent work by Collings and Jenkins in South Africa where failure by shear is examined in relation to failures to date at pavements constructed in City of Canning which do support Collings and Jenkins theory.
-
Sampling and laboratory testing of Ballina Clay
This paper discusses some topics related to the sampling and laboratory testing currently ongoing on Ballina clay (NSW). Emphasis is made on particular aspects of natural soft clays frequently neglected in laboratory procedures that may affect its mechanical response. Preliminary results are shown to highlight the importance of sample disturbance, salinity and rate effects in Ballina clay. Ongoing research as well as future activities are discussed in the last section of the paper. Implications for the current state of practice as well as the development of new constitutive models for soft clays are highlighted.
-
Effect of void ratio on swelling and permeability of bentonite
A series of experiments has been conducted at the Geosphere Research Institute of Saitama University, Japan to evaluate the effect of void ratio on swelling and permeability of bentonite. Void ratio is the prime criterion for swelling and permeability of bentonite and bentonite-sand mixtures when it is used as a buffer material for waste disposal facilities. At the end of swelling void ratio increased 7 to 8 times when compared with the initial state of the bentonite and bentonite-sand mixture. Permeability is also increased as a result of an increase in void ratio.
-
Geotextile Tubes In Environmental Applications
Geotextile tubes have been successfully used to dewater contaminated sediments, industrial process waste, agricultural process waste, sewerage sludge and other such waste stream products. The system provides a low cost, efficient means of containment and consolidation of waste. The technology is evolving with new developments in fabric construction and fabrication techniques. This paper reviews the historical development of geotextile containment products and the wider applications of use and then specifically discusses the installation and field performance of geotextile tubes used for dewatering waste in a sewage treatment plant (STP). The critical design parameters are discussed and related to the overall performance of the system at Winmalee STP. Geotextile containment and dewatering technology is versatile and lends itself to a wide field of engineering applications.
-
Piles Creek Embankment Collapse – The Investigations, The Expert’s Findings And Subsequent Improvements In Asset Management Of Culvert Structures On Major Roads In NSW
This paper outlines the methods and techniques adopted to gather the field investigation data to further our understanding of the failure mechanisms for the Pacific Highway Culvert at Piles Creek. Details of the combined expert’s opinions in to the mechanism and reasons for the failure will be presented.
Following the investigations and findings of the experts, the NSW Deputy State Coroner provided this recommendation in his Inquest report:
“…..development and implementation of its (Gosford City Council) assets management and records management systems with particular reference to the need to implement an effective inspection regime for road assets, the identification of risks associated with such assets, the timely response to risks that are identified and the effective managerial oversight of such systems”
Since this incident a significant amount of work has also been commissioned by the Roads and Maritime Services of NSW (RMS) to improve culvert asset management along their network of roads. The details of the RMS culvert asset management system are available to local councils. The paper will conclude with brief details of the RMS cataloguing and culvert risk assessment developments.
-
Excavation, Structural Stabilisation And Groundwater Management By Jet Grouting On Sydney Harbour Foreshore
A former town gasworks site on Sydney Harbour’s foreshore has been the subject of site remediation to address residual industrial contamination. Jet Grouting was undertaken under a Design & Construct contract to form a temporary retaining structure behind and under the full length of a 19th Century seawall, thereby facilitating the excavation and exsitu remediation of contaminated materials at the site and ensuring long-term stability of the seawall. In addition, existing heritage buildings were underpinned with Jet Grouting to ensure the structural stability and integrity of these structures during the excavation phase. The excavation was up to 7m deep and 6m below sea level. Jet Grouting was undertaken under strict settlement and deflection controls, with a target permeability no greater than 1×10-7 m/s. The works were performed by installing over 300 Jet Grout Columns ranging from 1.2m to 2.5m in diameter. Jetting was partially carried out from within the confines of existing heritage structures, while the bulk of the external works was carried out from within an environmental odour control enclosure. The confined nature of the site and its access limitations required the effective co-ordination of Jet Grouting with other site works.
-
Stability Assessment Of Dartmouth Dam Crest Road
This paper describes a case study where the AGS guidelines on Landslip Risk Management were utilised as part of a stability assessment undertaken by Golder Associates Pty Ltd for VicRoads at a site on the Dartmouth Dam Crest Road, located west of Dartmouth Village in North East Victoria. A previous investigation by others had recommended costly engineering works involving significant buttressing and rock anchoring work in a difficult and potentially dangerous environment. These recommendations were based on a subjective assessment. The objective of our work was to review and assess the available information, undertake a walkover survey and provide advice on the need and timing of remedial actions at the site. Advice was also required by the client on the relative risk that the site provides, options for action, and the relative urgency of such remedial actions.
-
On the need to consider kinematics when seeking to prevent the sudden collapse of the sides of coal mine roadways
In 2014 a portion of the side of an underground roadway at Austar Mine collapsed and crushed two coal mine workers. The investigation report prepared by the NSW Mine Safety Investigation Unit concluded that the collapse was a pressure burst. After reviewing the available evidence, this paper suggests that an alternative explanation is possible based on rock slope kinematics. The Austar event possibly can be explained as the collapse of a wedge in association with a very low intensity seismic event. Kinematics using either toppling or planar slide models can provide explanations for the collapse of unsupported ribs where joints or mining-induced fractures are vertical. Behaviour models based on kinematics can provide the basis for the specification of ground support. There is a need for geotechnical engineers in the underground coal industry to collect and analyse orientation data and to better characterise the shear strengths of joints, shears and fractured coal. There is also a need to consider mine seismicity in the context of accelerations as well as velocities.