Abstract Pumice-rich deposits are found in a number of locations around the world, and in particular across large areas of the North Island of New Zealand. Pumice grains are commonly described as being lightweight, highly crushable, and vesicular in nature. These characteristics give rise to…
Presented by Ricardo Dobry at the Geotechnical and Structural Engineering Congress, Phoenix, Arizona, February 2016 The focus of the Lecture includes New Zealand, San Francisco and Haiti.
The “Liquefaction-Induced Ground Movements Effects” workshop was held on the University of California, Berkeley campus at the Faculty Club, 2-4 November 2016. Fifty-five people participated in the workshop. Invited workshop participants included leading researchers in the area of soil liquefaction and its effects in the…
Resin injection has long been used internationally for the lifting or ‘level correction’ of buildings. For this purpose, expanding resin mixes are injected into the ground at relatively shallow depths, resulting in ground heave and building lift. It is logical to expect that this resin injection…
The major events of the Canterbury Earthquake Sequence (CES) caused significant land and building damage in Christchurch between September 2010 and December 2011. The extensive damage necessitated detailed ground investigations and liquefaction hazard assessments to inform repair and rebuild options. Relying solely on intrusive testing to provide sufficient…
In this paper we describe two case studies where a combination of geophysics and ‘conventional’ geotechnical techniques was used to characterise the sites for risk associated with voids in the near surface soils that could potentially collapse. One is a former mine site where the…
A number of field testing techniques, such as standard penetration test (SPT), cone penetration test (CPT), and Swedish weight sounding (SWS), are popularly used for in-situ characterisation. The screw driving sounding (SDS) method, which has been recently developed in Japan, is an improved version of the SWS technique…
The gel-push sampling technique was developed to try to provide an economic technique capable of obtaining high quality specimens of silty sands and sands. This paper describes two of the gel-push samplers which are now commercially available and describes their performance on recent projects carried out on…
The sleeve friction measurement, fs, is considered to be the least reliable of the three measurements in piezocone testing. It has been shown that the diameter of the friction sleeve in relation to the cone tip diameter has an effect on the sleeve friction measurements (fs). Testing…
This session report provides an overview of papers the presented at the conference that were related to liquefaction assessment. Aspects related to the current research and practice are also addressed by the reporters to provide an indication of the current state-of-the-art and of areas requiring further investigation….