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Sumi Siddiqua Greg Siemens James Blatz Alex Man Bee Fong Lim 《Geotechnical and Geological Engineering》2014,32(4):1029-1042
The producers of nuclear waste, within all countries exploring options, including Canada, have determined the long-term solution to be a deep geological repository. In the Canadian concept, within the deep geologic repository a number of clay-based barriers will separate the containers from the surrounding geosphere. Following placement the surrounding groundwater will infiltrate into the repository. In order to analyze the performance of the repository under very complex conditions, accurate material properties are required. The chemistry of the host rock is an important aspect as the behaviour of clay-based barrier materials could be affected by the saturating saline groundwater. This paper investigates the saturated mechanical behaviour of light backfill (composed of 50 % silica sand and 50 % Na-bentonite clay) and dense backfill (composed of 70 % crushed granite, 25 % glacial lake clay and 5 % Na-bentonite clay) and the quantifying the effect of pore fluid chemistry on the strength and compressibility behaviour of the materials. The results indicate that light backfill behaviour is strongly influenced by its pore fluid chemistry while dense backfill shows limited effects. The material parameters of light backfill and dense backfill are interpreted for input into numerical simulations. These results and interpretation enrich the understanding of the mechanical response of light and dense backfill, two components of the sealing system of the Canadian deep geologic repository. 相似文献
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Emslie Derek Siddiqua Sumi Crawford Bryn Teece Wayne 《Geotechnical and Geological Engineering》2022,40(3):1251-1266
Geotechnical and Geological Engineering - Clean drinking water is a necessity and recycling stormwater and greywater has been more appealing in the recent decades to provide filtered water for... 相似文献
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Natural Hazards - The probabilistic seismic hazard analysis (PSHA) has been performed for Bangladesh using background seismicity, crustal fault, and subduction zone source models. The latest ground... 相似文献
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Thermal conductivity is an important parameter to consider when designing clay-based barriers for use in deep geological repositories (DGR). In the DGR environment, the infiltration of local saline groundwater can potentially change the pore fluid chemistry of a barrier over its lifetime. This change in chemistry is known to alter the thermal properties of the barrier materials. In order to examine the impact of pore fluid salinity on thermal conductivity, experiments were conducted under both distilled water and saline pore fluid conditions. The material mixtures were prepared at two different dry densities using two different salt types. Furthermore, five different thermal conductivity prediction models were selected and evaluated on their performance with respect to the experimental outcomes. In general, these results indicated that an increase in the constituent pore fluid’s salt concentration leads to a decrease in the thermal conductivity of the material. Additionally, the thermal conductivity values of the materials prepared at a high dry density were greater than of those compacted at a low dry density. 相似文献
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Study of compressive loading capacities of helical piles using torque method and induced settlements
Torque is a most widely used method to estimate the load capacities of helical piles because of its simplicity and minimal costs. This research attempts to investigate the torque method by incorporating settlements and involves its comparison with bearing equations which have also been used to estimate the capacities of helical piles. The test program consisted of installation of seven helical piles including a static axial compression test to estimate the corresponding settlements. The compression test was conducted on the seventh pile which is referred to as the test pile. The load movement curve of the test pile is used to predict the settlement of each pile corresponding to the ultimate load calculated using torque method. In addition, few methods to interpret the load movement curve have been discussed. This research would pave way to yield more reliable results using torque method and could lead to the large-scale usage of helical piles. 相似文献
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ElMouchi Ahmed Siddiqua Sumi Wijewickreme Dharma Polinder Herbert 《Geotechnical and Geological Engineering》2021,39(5):3315-3336
Geotechnical and Geological Engineering - Organic soils are considered one of the most problematic soils due to their high compressibility and low shear strength at small strains. Characterizing... 相似文献
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Natural Hazards - The ground motion intensity of an earthquake is significantly changed when seismic waves propagate from the bedrock to the near-surface soft geological materials. The ground where... 相似文献
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