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首页> 美国政府科技报告 >Experimental Residential Foundation Designs on Expansive Clay Soils. Data Supplement
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Experimental Residential Foundation Designs on Expansive Clay Soils. Data Supplement

机译：膨胀土的实验住宅基础设计。数据补充

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This report documents activities associated with the design and construction of 11 single - family residences and the behavioral pattern of these structures over 6 seasonal climatic cycles or about 3 years. The floor slabs for all the houses were of reinforced concrete and were placed on the residual highly - expansive clay soils of the Eagle Ford formation located in the Fort Worth - Dallas, Tex., area. The control slab - on - ground for performance comparison was designed in accordance with the Building Research Advisory Board (BRAB) criteria. Eight experimental slabs - on - ground were designed by modifying the BRAB criteria for both reduced and thin sections where the subsurface soil volume change was considered to be inhibited or minimized by various stabilization techniques. One cantilevered, post - tensioned slab - on - ground was designed and constructed on soils in their insitu condition. One locally - used slab - on - ground was both designed and placed by the builder / developer and was monitored for comparative purposes. The subsurface soils beneath each house were instrumented with moisture - temperature cells paired at each elevation and depth in boreholes separated by 1 foot. Borings were located at the midpoint of each side of the house and at the slab center. Permanent leveling inserts were placed in the perimeter beam around each house to determine vertical movements with time. All elevations were referred to a permanent bench mark installed in the project area. Results indicate that preswelling a desiccated soil by raising the natural moisture content by a minimum of 2 to 3 percent above the plastic limit and maintaining the moisture at this level by use of vertical barriers significantly inhibits volume changes in expansive clay soils due to seasonal weather cycles. This was evidenced for both total vertical movements and differential movements. Soil moisture data, soil temperature data, extensive tabular data and numerous graphs are included. The appendix presents supplementary reports. (Author abstract modified).

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