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A Useful Tool For Earthworks Control – The Dilatometer
This paper briefly discusses and promotes the use of the in situ Flat Dilatometer test (DMT) for at least some earthworks control. The paper is meant to provoke thought, as follows:
- Geotechnical design is most often based on two parameters, soil strength and modulus. Yet these two parameters are seldom specified or measured as part of earthworks contracts.
- The author holds the view that the main reason for this is βhistoryβ. Practical methods were not available in the past to directly measure strength and modulus in the field.
- Advances in in situ testing technology make such measurements possible today.
- Why not, where relevant, include these design-required parameters within earthworks specifications, and why not measure them and make achievement of them part of the earthworks acceptance process?
One, now available, tool that can defensibly measure both strength and modulus and is robust and simple to use, is discussed within this paper, the Flat Dilatometer.
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Performance And Prediction Of Soft Clay Behaviour Under Vacuum Conditions
This paper describes the behaviour of soft soil foundation under vacuum-assisted preloading at the Second Bangkok International Airport, Thailand. An analytical solution considering the variation of soil permeability and compressibility is proposed. The associated settlement and excess pore pressure at the embankment centerline are predicted and compared with the available field measurement. The field data shows that the efficiency of this improvement technique depends on the magnitude and distribution of vacuum pressure as well as on the extent of air leak protection. The height of sand surcharge and consolidation time can be significantly reduced in comparison with the conventional method of surcharge alone.
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AGS QLD Symposium 2018
Innovative Geotechnical Practice within Major QLD infrastructure projects
Geoff Burns, Clinton Chan, Matthew Dews, Ajith (Diss) Dissanayake, Scott Fidler, Pat Gibbons, Greg Hackney, Jared Lester, Rick Martin, Graham Rose, Tiasha de Silva, Greg Anderson and Amir Shahkolhi
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Sustainable Lining for Underground Hard Rock Openings
Conventional cast-in-situ concrete linings are costly, time consuming and environmentally unfriendly solutions for supporting hard rock excavations, because concrete linings are unable to utilise the inherent strength of the rock. It is well understood that rock support is the application of a reactive force to the surface of an excavation such as concrete lining for example; whereas rock reinforcement is a means of conserving or improving the overall rockmass properties from within the rockmass by techniques such as rock bolts, cable bolts and ground anchors. This rock reinforcement strategy introduced to the tunnel roof and walls is considered to be a supporting element capable of sustaining a thrust at the arch ends. However, a potential small rock wedge failure is highly probable and may occur in between rock bolts. To deal with this issue, shotcrete linings will then be introduced acting as thin βprotective skinβ liners to support the rock surface with performance similar to a reinforced concrete slab. As the reinforced rock arch provides the required support to the opening, this shotcrete liner will then be designed to act as permanent protection cover and to comply with structural and durability requirements. Examples referenced in this paper demonstrate that the thickness of this shotcrete liner is relatively thinner than traditional concrete lining. Due to reduction of the permanent concrete lining thickness, the total excavation volume of caverns/tunnels is also reduced. As it minimises the use of cementitious products for permanent lining construction, thus leading to reduced CO2 emissions and lower energy.
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Design Methods for Driven Piles in Sand and Clay
Dr Fiona Chow
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CPT in Antarctica
CPT is used extensively to determine material properties in soils and clays, however, it has not previously been used in hard polar snow. Therefore, existing CPT equipment was adapted for use in Antarctica to assess polar snow to depths of 10 m or more where resistances may exceed 10 MPa. Snow is a rate dependant material and numerous factors must be considered when interpreting CPT in polar snow, but valuable parameters such as snow shear strength, stratigraphy and relative density may be obtained using CPT in polar snow.
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Recent Development in Seismic Hazard Assessment in Australia
Dr Paul Somerville
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From Drought to Deluge: Case studies & Improving Slab Performance
Geotechnical & Engineering Workshop
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Geomechanics Career Presentation
Geosciences Pathway Project