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Case Histories
Published in Pat M. Cashman, Martin Preene, Groundwater Lowering in Construction, 2020
Occasionally, groundwater lowering operations can cause damaging settlements. One such case occurred when a 15 m diameter shaft was being sunk by caisson methods. The shaft was in an urban area, and the nearest existing structure was located around 5 m from the edge of the shaft. Ground conditions were Glaciolacustrine Deposits that were predominantly very low-permeability clay with some laminations or thin layers/lenses of sand were expected. The Glaciolacustrine Deposits were underlain by fractured bedrock of higher permeability, which formed a confined aquifer (Figure 27.13a).
Glacial geology
Published in Barry G. Clarke, Engineering of Glacial Deposits, 2017
As a glacier melts, debris is transported by water to be deposited on, within, beneath or beyond the glacier creating glaciofluvial deposits that have similar geotechnical characteristics to other fluvial deposits as they are gravitationally consolidated. If a glacier terminates in water, sedimentation of glacial debris creates glaciolacustrine deposits when formed in a standing body of fresh water such as that found at ice margins; and glaciomarine deposits when a glacier terminates in the sea. The full list of glacial soils is given in Table 2.1 and their evolution in Figures 2.5 through 2.8.
Development of mechanical properties of Edmonton stiff clay treated with cement and fly ash
Published in International Journal of Geotechnical Engineering, 2020
Natural soil samples in disturbed and undisturbed states were collected from a site located in eastern Edmonton, where the DSM is to be performed to support oil storage tanks. Soils at this site were formed as the glaciolacustrine deposit of Great Edmonton Lake that existed after the last glacial period in the Holocene (Godfrey 1993). Edmonton stiff clay is usually an interbedded combination of cohesive soils with sand or silt.