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Geoenvironment: Protecting the Environment using Geosynthetics
Some answers and some questions
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The use of rapid impact compaction for ground improvement prior to sheet pile installation in sandy fill at the Australian Marine Complex, Henderson, WA
The use of Rapid Impact Compaction to compact the loosely placed gravelly sand fill materials available at the Australian Marine Complex south of Perth, WA is presented. A compaction trial was undertaken to assign the optimum number of passes and grid spacing. Pre and post-compaction Cone Penetration Test (CPT) results were used to confirm whether total cumulative momentum (as opposed to momentum per blow) is a better indicator of the depth of improvement achievable as compared to the traditional use of compaction energy per blow at the site. Two methodologies that describe the profile and degree of improvement are also discussed.
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Phenomenon of Mud Pumping in Rail Tracks
Fundamental Concepts and Practical Implications
Distinguished Professor Buddhima Indraratna
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Working platform assessments for tracked plant
Bruce McPherson
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Ground Improvement Of Granville Harbour Wind Farm Foundations Using CMC
Granville Harbour Wind Farm is located on a remote site that is approximately 35 km northwest of Zeehan on Tasmania’s west coast. The project includes 31 wind turbines with the capacity to generate 112 MW of power when it is complete. Each giant turbine is 137 m from ground level to rotor hub and 200 m from ground level to blade tip. The site’s ground profile consists of extremely weathered to highly weathered volcaniclastic breccia overlain with stiff clays, silts and embedded basalt cobbles. At 27 turbine locations, the ground did not meet the project’s requirements and specific measures were required to improve the foundations’ behaviour. Whilst piling is commonly used for improving bearing and reducing ground settlements of foundations of highly sensitive structures, in an innovative first-time approach in Australia, an alternative foundation solution using Controlled Modulus Column (CMC) rigid inclusions was considered and developed to allow the safe operation of the turbines more affordably. During this process, foundation systems were designed for eight ground models. Approximately 44,000 m of CMC were installed to support the wind turbines. The longest and shortest columns were respectively 4.5 m and 22.8 m. Quality control and assurance included the installation of trial columns, concrete testing, integrity testing and static load testing of the columns.
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Performance of battered mini driven pile group in basaltic clays: field testing and numerical modelling
A new battered mini driven pile group footing system developed recently in Victoria, Australia shows considerable advantages compared to traditional reinforced concrete footings. It can be manually handled and installed with light jackhammers without the need for an excavation or drilling. Soil disturbance is also much lower than other types of foundation systems and being concrete-free system leads to a shorter construction time and lower cost and carbon footprint. This new system is known as Surefoot. One of the best methods to ascertain the performance of foundation systems is field load testing. To evaluate the ultimate capacity of this system, eight static compression and pull-out tests were performed. The results were discussed according to commonly used interpretation methods and 3D numerical modelling. These tests were all conducted in an area of quaternary basaltic clay deposits in Braybrook, Victoria. This paper presents results of the soil investigation in terms of in-situ and laboratory tests, field static load tests and evaluation of the current design method. The field test and numerical modelling results suggests that the new battered mini driven pile system is a time and cost effective alternative to traditional footing systems.