Feldspathic Sandstone Flagstone from Near Hudson Hope, Northern British Columbia - Potential for Sandstone Production in British Columbia
There are a number of well-established flagstone and dimension stone producers supplying the existing market in Western Canada and adjacent US states. Such products are distributed in pallets of approximately 1 cubic metre (around 2 metric tonnes) (Photos 1, 2 ), sorted by thickness and degree of processing, such as with or without sharp edges, random or square shapes, etc. The BC and Alberta products are complemented by imported stone types not available from local producers.
Report on the Building and Ornamental Stones of Canada
THIS volume constitutes the third part of the monograph on the building and ornamental stones of Canada, and worthily upholds the high standard established in the earlier portion of the work. The greater part of this report is occupied by a systematic account of the quarries of the maritime provinces and of their products. The stones are considered according to the class to which they belong, e.g., granite, black granite (greenstones), sandstone, limestone, &c., and arranged according to more or less definite geographical areas into which the quarries o naturally fall. In order to give prominence to the economic and commercial aspect of the work, the quarries are described under the name of the owner wherever possible. The general plan adopted for the description of individual properties is: (a) quarry observations; (b) description of the stone, with tests; (c) economic remarks and statistics; (d) examples of the use of the stone. Sketch maps are given showing the geology and location of quarries in important districts; special mention must be made of the excellent colour-photo plates which show in an admirable manner the colour and appearance of the stones, a feature which should be appreciated by architects.Report on the Building and Ornamental Stones of Canada.Vol. ii., Maritime Provinces. By Dr. Wm. A. Parks. Pp. xii + 264. Plates i–xlv, sketch maps 1–9. (Ottawa: Government Printing Bureau, 1914.)
Centrifuge modelling of effects of shield tunnels on existing tunnels in soft clay
With the rapid development of the subway network,the phenomena of shield tunnels going across the adjacent tunnels are becoming more and more common.The interaction between shield tunneling and nearby tunnels is more complicated than the ordinary shield tunneling in intact soil strata.Based on the project of Shanghai Bund Passage crossing Metro Line 2,the method of centrifuge modeling together with the field measurement is employed to study the effects shield tunneling on nearby strata and existing tunnels.In centrifugal model tests,the effects simulation techniques considering the unloading of excavation,ground loss and grouting are developed to analyze the longitudinal settlement of the shield tunnel and the existing tunnel induced by the shield tunneling.Besides,the deformation distribution and settlement curves of the existing tunnels during shield construction are studied by using the monitoring data.