Soft zones in the glacial till in downtown Edmonton

1982 ◽  
Vol 19 (2) ◽  
pp. 175-180 ◽  
Author(s):  
S. Thomson ◽  
R. L. Martin ◽  
Z. Eisenstein
Keyword(s):  
Recent Work ◽  
Case History ◽  
Early Experience ◽  
Site Investigation ◽  
Glacial Till ◽  
Geological Model ◽  
High Rise ◽  
Material Type ◽  
Spread Footings

High-rise buildings in downtown Edmonton have generally been founded on spread footings in glacial till. Early geotechnical work proposed a geological model comprising uniform, very dense basal (lodgement) till. However, recent work shows that the till is more complex, being variable in both material type and consistency. A case history is described that exemplifies this variability. It is concluded that early experience with the dense tills has led to an overconfident approach to soil investigation in this area and that a thorough site investigation is required.

Successful application of CSAMT for high‐rise buildings' site investigation in urban areas of Tangshan city, China

2010 ◽  
Author(s):  
Qingyun Di ◽  
Diquan Li ◽  
Hui Cheng ◽  
Changmin Fu ◽  
Miaoyue Wang
Keyword(s):  
Urban Areas ◽  
Site Investigation ◽  
High Rise

Brownfield Site Investigation Using Geophysics: A Case History From East Chicago

1998 ◽  
Author(s):  
Jennifer Halt ◽  
Jeffrey Daniels ◽  
Mark Vendl ◽  
Francois Baumgartner ◽  
Stanley Radziviscius
Keyword(s):  
Case History ◽  
Site Investigation ◽  
Brownfield Site

Characterisation of the Geology of the UK Low Level Waste Repository

2011 ◽  
Author(s):  
John Shevelan ◽  
Nicholas T. Smith
Keyword(s):  
Site Investigation ◽  
Environmental Safety ◽  
Geological Model ◽  
Hydrogeological Model ◽  
Geological Interpretation ◽  
Low Level ◽  
Geological Models ◽  
Waste Repository ◽  
Site Characterisation ◽  
The Uk

The UK Low Level Waste Repository Ltd (LLWR) submitted an Environmental Safety Case (ESC) for the disposal of low-level waste (LLW) to the UK Environment Agency on the 1st of May 2011. As part of the ESC, the LLWR have to demonstrate that a programme of site investigation and site characterisation has been carried out to provide the requisite information for the ESC and support facility design and construction. This paper explains the development of the site investigation programme and how the understanding of the geology of the site has developed. The geological environment in the region of the LLWR consists of Quaternary age deposits overlying older bedrock. The site has been subjected to a series of site investigation programmes from 1939 to the present day. The development of 3-D geological models was necessary to integrate data from boreholes, trial pits, geophysical investigations and beach exposures and data gained from site operations. The understanding of the geology has developed with each new set of data. Early simple interpretations from a few boreholes have been superseded by a series of more complex interpretations each incorporating the increasingly detailed observations. Initial attempts to develop a lithostratigraphic representation of the geology proved difficult. It was also difficult provide a clear link between the geology and the hydrogeology using a lithostratigraphic approach as required for the development of hydrogeological models. A lithofacies approach to characterising the geology was adopted in 2007, which has allowed the grouping of geological units with similar hydraulic properties and the development of a regional 3-D geological model. The 3-D geological model has been used as the framework for the development of a hydrogeological model for the site. The development of the 3-D geological models has been iterative. It was observed that there are differences between models developed using solely mathematical interpolation and those controlled by geological interpretation. The different representations of the geological information have been used to consider the effects of uncertainty in the geological interpretation in the hydrogeological modelling.

Embankment failures at Vernon, British Columbia

1995 ◽  
Vol 32 (2) ◽  
pp. 271-284 ◽  
Author(s):  
C.B. Crawford ◽  
R.J. Fannin ◽  
C.B. Kern
Keyword(s):  
Case History ◽  
Field Observation ◽  
Factor Of Safety ◽  
Strain Softening ◽  
Progressive Failure ◽  
Back Analysis ◽  
Site Investigation ◽  
Silty Clay ◽  
Pore Pressures ◽  
Similar Materials

A section of Highway 97, west of Vernon, B.C., is located over a soft-to-firm, compressible, silty clay subsoil. In addition to an extensive site investigation, the performance of two test embankments was observed for 2 years before construction was begun on the highway grade between them. When the highway fill reached a maximum thickness of about 10 m a failure occurred. The design was then changed to include berms on either side, but a second failure occurred when the grade was rebuilt. An undrained back-analysis of the first failure shows the influence of various variables on the factor of safety and illustrates the difficulty of choosing appropriate strength values for design when the site has a strong crust overlying a weaker layer and there is potential for progressive failure. Observations of settlements, pore pressures, and lateral movements in the subsoil describe the performance of the embankment during construction and reveal the importance of strain softening as a factor in the failures. Comparisons with a variety of similar failures in Canada, Scandinavia, and southeast Asia provide some guidance for future construction over similar materials. Key words : case history, embankment failure, field observation, pore pressures, stability, strength, undrained analysis.

scholarly journals The capability of terrestrial laser scanning for monitoring the displacement of high-rise buildings

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Trung Dung PHAM ◽  
Quoc Khanh PHAM ◽  
Xuan Cuong CAO ◽  
Viet Hung NGUYEN ◽  
Sy Cuong NGO
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Terrestrial Laser Scanning ◽  
Site Investigation ◽  
Time Saving ◽  
High Rise ◽  
Point Density ◽  
Monitoring Procedure ◽  
Data Acquisition And Processing ◽  
Scanning Geometry

Recently, terrestrial laser scanner (TLS) has been increasingly used to monitor ofdisplacement of high-rise buildings. The main advantages of this technique are time-saving, higherpoint density, and higher accuracy in comparison with GPS and conventional methods. While TLS isordinary worldwide, there has been no study of the capability of TLS in monitoring the displacement ofhigh-rise buildings yet in Vietnam. The paper's goal is to build a procedure for displacement monitoringof high-rise buildings and assess the accuracy of TLS in this application. In the experiments, a scannedboard with a 60 cm x 60 cm mounted on a moveable monument system is scanned by Faro Focus3DX130. A monitoring procedure using TLS is proposed, including three main stages: site investigation,data acquisition and processing, and displacement determination by the Cloud-to-Cloud method (C2C).As a result, the displacement of the scanned object between epochs is computed. In order to evaluate theaccuracy, the estimated displacement using TLS is compared with the real displacement. The accuracydepends on scanning geometry, surface property, and point density conditions. Our results show that theaccuracy of the estimated displacement is within ± 2 mm for buildings lower than 50 m of height. Thus,TLS completely meets the accuracy requirements of monitoring displacement in the Vietnam Standardsof Engineering Surveying. With such outstanding performance, our workflow of using TLS could beapplied to monitor the displacement of high-rise buildings in the reality of geodetic production inVietnam.

The Influence of Bulking Material Type and Volume On In-house Composting in High-Rise, Caged Layer Facilities

2001 ◽  
Vol 9 (1) ◽  
pp. 50-59 ◽  
Author(s):  
F. Dean Miner ◽  
Richard T. Koenig ◽  
Bruce E. Miller
Keyword(s):  
High Rise ◽  
Material Type

Settlement Performance of the Burlington Bay Skyway

1971 ◽  
Vol 8 (2) ◽  
pp. 252-271 ◽  
Author(s):  
M. A. J. Matich ◽  
A. G. Stermac
Keyword(s):  
Case History ◽  
Ground Level ◽  
Steel Beam ◽  
Rolled Steel ◽  
The North ◽  
North Side ◽  
Northern Half ◽  
Spread Footings ◽  
Timber Piles ◽  
Considerable Depth

The Burlington Bay Skyway is founded on a deep baymouth bar which is believed to be about 10 000 years old and to be normally loaded with respect to present ground level. Beneath the northern half of the bar there is a considerable depth of clay, which is also believed to be normally loaded under the weight of the bar. Bedrock occurs directly beneath the southern half.The skyway is symmetrical about Burlington channel, which is approximately centrally located along the length of the bar. Foundations include 74 piers and the abutments. Two main piers are carried on steel H-piles acting in friction, while 20 other piers on the north side are founded on short timber piles. All other piers, and the abutments, are founded on spread footings. The superstructure is of steel construction incorporating plate girder and rolled steel beam spans with continuity in units of three and four spans, respectively. Computations carried out during design indicated that differential settlements could exceed tolerable limits for continuous spans. Provision for shimming was therefore made, and settlement observations taken to provide the necessary control.The results of the settlement readings are presented primarily as a case history, along with a number of unusual features in the foundation subsoil arising out of its origin as a deep bar deposit.

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