A5026771988- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Geotechnical Engineering and Underground Structures
- Geotechnical and construction materials studies
- Seismic Performance and Analysis
- Geotechnical Engineering and Analysis
- Landslides and related hazards
- Soil and Unsaturated Flow
- Grouting, Rheology, and Soil Mechanics
- Rock Mechanics and Modeling
- Structural Engineering and Vibration Analysis
- Structural Health Monitoring Techniques
- earthquake and tectonic studies
- Granular flow and fluidized beds
- Seismic Waves and Analysis
- Geotechnical and Geomechanical Engineering
- Structural Behavior of Reinforced Concrete
- Seismology and Earthquake Studies
- Tree Root and Stability Studies
- Seismic and Structural Analysis of Tall Buildings
- Engineering Structural Analysis Methods
- Dam Engineering and Safety
- Soil, Finite Element Methods
- Hydrocarbon exploration and reservoir analysis
- Railway Engineering and Dynamics
University of Auckland
2013-2024
University of Canterbury
2009
Iowa State University
2009
Ministry for Primary Industries
1976
The 22 February 2011, Mw6.2-6.3 Christchurch earthquake is the most costly to affect New Zealand, causing 181 fatalities and severely damaging thousands of residential commercial buildings, city lifelines infrastructure. This manuscript presents an overview observed geotechnical aspects this as well some completed on-going research investigations. A unique aspect, which particularly emphasized, severity spatial extent liquefaction occurring in native soils. Overall, both was greater than...
On 4 September 2010, a magnitude Mw 7.1 earthquake struck the Canterbury region on South Island of New Zealand. The epicentre was located in Darfield area about 40 km west city Christchurch. Extensive damage inflicted to lifelines and residential houses due widespread liquefaction lateral spreading areas close major streams, rivers wetlands throughout Christchurch Kaiapoi. Unreinforced masonry buildings also suffered extensive region. Despite severe infrastructure houses, fortunately, no...
Abstract Solutions for the expansion of cylindrical and spherical cavities in sands are presented. The sand is modelled using recently proposed critical‐state models which values friction dilation angles depend on deformation history. Similarity solutions obtained enable limit pressure to be calculated as a function initial conditions. Comparisons with existing perfectly plastic theories made consequences interpretation cone penetrometer measurements indicated.
Methods of assessing, for preliminary design purposes, the stiffness and capacity pile foundations under seismic forces are presented. Although main thrust paper is to aseismic methods applicable other forms dynamic excitation foundations. Emphasis placed on expressions in form simple formulae that can be incorporated into spreadsheet or similar types software. The use equations illustrated with a number worked examples. Where possible justified by data from field testing at prototype scale.
Abstract Upper bound techniques are used to analyse the stability of slopes material failing according a non‐linear failure criterion, such as closely jointed rocks. The global, extremal nature upper calculations is discussed, inverse use procedures for obtaining safe lower estimates strength properties in back analyses. Specific results presented model proposed by Hoek and Brown.
A mathematical model is formulated to represent the stress-strain behaviour of overconsolidated soil. The full range from lightly heavily over-consolidated states covered. basis utilization a constitutive equation for work-hardening plastic material. fits into general framework provided by critical state view soil behaviour. As with other models four parameters characterize particular These are determined routine laboratory tests. object enable good qualitative predictions wide be made using...
This paper aims to simulate the thermomechanical behaviour of saturated clays in triaxial stress space at states wetter than critical condition. A thermoelastic-plastic (TEP) mechanical model was developed under framework state soil mechanics and modified Cam-Clay model. It consists two parts. The first part involves an isotropic TEP that is able reproduce thermally induced volume change clay specimens normally consolidated overconsolidated conditions. introduced earlier validated by...
Sands containing pumice particles are widely distributed over the Waikato Basin, North Island in New Zealand. These pumiceous sands, due to vesicular nature and presence of internal voids particles, highly crushable, compressible, lightweight; factors which make them problematic from an engineering point view. In this paper, order investigate effect particle shape crushing on undrained cyclic behavior natural we report results triaxial tests performed sand Toyoura with different relative...
Lateral dynamic experiments were performed on small-scale pile groups at two different sites, one with stiff soil and the other soft soil. The diameters spacings varied to create spacing diameter (s/d) ratios of between 2.25 15.0. results showed group interaction effects be negligible s/d greater than 12 for site, 16 site. are first alter both confirm that spacing-to-diameter ratio is an important parameter when calculating effects. testing was found cause a permanent nonlinear response in...
Pumice occurs widely in New Zealand and is important infrastructure construction, but not readily characterized situ. It a unique material, the particles of which crush easily under finger pressure, making it arguably most delicate suite crushable soils found various locations around world. In this study, we scanned pumice different sizes using an X-ray computed tomography (CT) scanning machine to investigate particle microstructure. Using image analyses, were able determine solid density...
A dramatic consequence of the Christchurch, New Zealand, earthquakes 2010 and 2011 was widespread liquefaction in city. Part central business district (CBD) badly affected by but elsewhere large volumes ejecta were not evident for those parts CBD where upper layers soil profile are sandy gravel gravelly sand. The purpose paper is to investigate effect permeability on rise dissipation excess pore water pressure during cyclic loading a idealised from Christchurch data. Cyclic1D software, which...
Pumice materials are problematic from engineering and construction viewpoints because of their lightweight, highly crushable compressible nature. The mechanical properties pumice sands at particle-size level were investigated to better understand behaviour. X-ray computed tomography images showed internal surface voids within the particles. characteristics then compared with those other hard-grained soils. Detailed investigation that samples consist different types Next, single-particle...
Geothermal, as a source of renewable energy (power and heating), has the potential to meet 3–5% global demand by 2050. For some high-temperature reservoirs, technical challenge that may constrain deployment is ground subsidence caused reservoir pressure decline. At Wairakei–Tauhara geothermal system in New Zealand, an integrated geotechnical-geoscientific investigation causes local anomalies (up 15 m, accumulated over 50 years) successfully identified modelled factors, mechanisms processes...
One of the assumptions standard consolidation theory used in soil mechanics is that coefficient a material property remains constant during process. This note demonstrates numerically effect on rate changes with increasing effective stress. The letter proposes set dimensionless curves when changing linearly over incremental stress generating consolidation.
Abstract Crushable volcanic soils are well-known for their distinctive texture, vesicular nature and grain fragility. These features of lead to difficulty in interpreting the results laboratory field testing because occurrence particle crushing. Sands containing pumice particles commonly found Hamilton Basin North Island New Zealand. The originated from a series eruptions centered Taupo Rotorua regions. As result flooding erosion along Waikato River, have become mixed with other materials...