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TMI assessment and climate zones in Western Australia
Thornthwaite Moisture Index (TMI) is commonly used in climate zone classifications when designing residential slabs and footings on foundation soils with potential surface movements due to moisture changes. However in the current design guidelines β AS2870-2011, there is no specific guidance for the large land area of Western Australia. This paper has collected climate data in 39 town specific locations for 25 years (1988 ~ 2012). The TMI values were calculated using the method by Thornthwaite (1948). A climate zone map of Western Australia was produced based on the average TMI values of each town specific locations. The new climate zone map provided better predictions on the depth of soil suction change due to moisture change in Lake King, Ravensthorpe and Jerramungup with field data available.
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GIS for Geotechs Short Course
Colin Mazengarb, Senior Geologist, Mineral Resources Tasmania (MRT)
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Underground Construction In Urban Areas β Challenges For Innovation
The paper is intended to highlight and discuss the solution to major challenges of planning underground projects in urban environments. These discussions are presented in the form of examples from the viewpoint of a practitioner, who is deeply involved in the actual design for the implementation of such projects. Infrastructure in large cities is getting denser over time. Therefore, interference with existing structures is becoming a very common feature during the implementation process of new projects. As a consequence, actual geotechnical challenges often relate to the application of innovative methods of construction in order to minimize potential construction impact or disruption. The paper wants to direct the focus on the application of unusual construction methods and related design and construction challenges.
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Point-load testing chips of rock
Hole production in the mining and petroleum industries produces chips of rock ranging in size from a few mm up to approximately 15 mm. Chips have however generally been considered too small for strength testing. The current research has shown that it may be possible to obtain the strength of chips from well-sorted, homogeneous, rocks, having fine to medium particle size, when tested perpendicular to discontinuities, using a standard point load test apparatus with modified platens. The modification only requires the 5 mm ball bearings on the tips of the platens to be replaced with 1 mm ball bearings. More research is however required to validate the result.
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Artificial Neural NetworkβBased Settlement Prediction Formula For Shallow Foundations On Granular Soils
The problem of estimating the settlement of shallow foundations on granular soils is very complex and not yet entirely understood. The geotechnical literature has included many formulae that are based on several theoretical or experimental methods to obtain an accurate, or near-accurate, prediction of such settlement. However, these methods fail to achieve consistent success in relation to accurate settlement prediction. Recently, artificial neural networks (ANNs) have been used successfully for settlement prediction of shallow foundations on granular soils and have been found to outperform the most commonly-used traditional methods. This paper presents a new hand-calculation design formula for settlement prediction of shallow foundations on granular soils based on a more accurate settlement prediction from an artificial neural network model. The design formula presented is a quick tool from which settlement can be calculated easily without the need for computers.