Ed Mcroberts

Ed Mcroberts
Amec Foster Wheeler

16.93

About

21
Publications
9,609
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475
Citations
Introduction
Skills and Expertise

Publications

Publications (21)
Article
Full-text available
When sandy soils respond in a strain-softening manner to undrained loading, an estimation of the resulting undrained shear strength (Su) is required to determine the potential for flow liquefaction at a given site. One of the most commonly used methods for estimating the undrained strength of liquefied sand is an empirical standard penetration test...
Article
An analysis of the engineering behavior of a thawing soil requires knowledge of the rate of melting. Some solutions for heat transfer in thawing soils are reviewed. The relative importance of the thermal properties necessary for solution is assessed and some properties of frozen soil are found to be of secondary importance in a thawing problem. Som...
Article
As a result of recent field exploration and study in the Mackenzie River Valley between Fort Simpson and Fort Good Hope, N.W.T., coupled with a review of the periglacial literature it is evident that thaw plays an important role in a wide range of landslide types associated with permafrost.This study seeks first to present a description of the most...
Article
A field study of landslides has shown that certain types of mass movement in the Mackenzie Valley, N.W.T. are associated with shear failure in frozen soil. These land-slides have been classified on a descriptive basis as being block and multiple retrogressive slides. A detailed description of the characteristic morphology, and of the soil and perma...
Article
This study presents the solution to a simple model for deformations due to secondary creep in permafrost slopes. By introducing a constitutive relationship, or flow law, for ice into the model it is shown that significant creep deformations can occur in frozen slopes. Evidence is reviewed that suggests that secondary creep in ice-rich soils may be...
Article
Case histories are considered which indicate that under some field conditions a thaw interface proceeds as predicted by a simple model. Some reasons for possible deviations are investigated and comparisons are made between calculated and measured rates of thaw.
Article
When a freezing front advances through a saturated soil water may either be expelled or attracted to the freezing front depending upon soil type, stress level, and rate of freezing. Experimental evidence is considered which shows that coarse-grained sandy soils expel water under most conditions while fine grained soils can be made to expel water on...
Article
A design philosophy for piles in ice and ice-rich permafrost is proposed, whereby the pile settlements over the design life of the structure are retained within acceptable limits.The secondary creep law for ice is reviewed and the relationships between secondary creep rate, stress, and temperature are obtained using existing creep test data from ma...
Article
The sedimentation behaviour of thick dispersions of mineral grains and water, a process that can be called hindered settling, is of some interest in geotechnical practice. This study draws attention to the existence of the phenomenon, investigates the laws governing the settling behaviour of dispersions and provides experimental verification of the...
Article
The paper focuses on a review of elements of the liquefaction of sand. Consideration is given to both the static and cyclic approach, and the bases for many of the divergent opinions that currently exist are given. The objective of the paper is to state the arguments and to explore common ground. By considering the inconsistencies that currently ex...
Article
Full-text available
The traditional impoundment where a dam(s) retains pumped slurried tailings with solids contents typically in the range of 30-40% remains the most common method for storing the tailings from milling operations. However, there are a growing number of operationswhereby the tailings are dewatered and placed in the tailings storage facility with less a...
Article
The evaluation and performance of four upstream-constructed tailings dams in South America are presented. All four dams were constructed beginning in the 1990's. The juxtaposition of the same design to four sites, each with unique site and operating conditions, led not surprisingly to four different outcomes. These outcomes ranged from outright fai...
Article
Full-text available
Upstream constructed tailings dams represent a significant challenge to the geotechnical engineer in terms of analysis of their stability, in large part because the shear strength of the loose sands and fine grained or "slimes" components of such structures is open to considerable uncertainty. In particular, it is critical that the behavior of the...
Article
Reclaimed tailings disposal sites must be configured to avoid the possibility of catastrophic dewatering to ensure long term sustainability. This can normally be achieved by dewatering tailings impoundments and breaching tailings dams or by reducing the size of the pond to a shallow ponded area far removed from any dam.. Where tailings are stored i...
Article
The Berkeley trigger criterion for evaluating the potential for earthquake-induced phenomena in sandy soils is reviewed in this paper. The historical database comprising the criterion is reconsidered using a consistent ''weakest-link-in-the-chain'' approach. Revised plots of average cyclic stress ratio (CSR) versus (N-l)(60) are presented using the...
Article
Geotechnical engineering embraces soil mechanics, rock mechanics, and engineering geology. In practice it employs a wide variety of techniques ranging from site mapping and characterization to advanced theoretical analysis and performance monitoring. This paper draws on the development of the Alberta oil sands as a case study to illustrate the brea...
Article
The development of an open-pit mine at Thompson, Manitoba, required the excavation by dredge of 17.6 × 10⁶ m³ of overburden. The overburden consisted primarily of normally consolidated glaciolacustrine soils found beneath Thompson Lake. The paper reviews the geological and geotechnical characteristics of the varved deposits and the basis for establ...
Article
Full-text available
Within the entire range of failure modes that have occurred at tailings impound- ments static liquefaction is likely the most common, and at the same time likely the least understood. As design practice in many mining regions has in fact discounted the possi- bility of the mechanisms and criteria for this failure mode, the possibility of its occurr...

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