I-15 reconstruction long-term embankment monitoring study : final report.
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2012-05-01
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Abstract:The I-15 Reconstruction Project in Salt Lake City, Utah required rapid embankment construction in an urban environment atop soft lacustrine soils. These soils are thick, highly compressible, have low shear strength and require significant time to complete primary consolidation settlement. Because of this, innovative embankment systems and foundation treatments were employed to complete construction within the approved budget and demanding schedule constraints. This final report completes a monitoring project that has provided a wealth of information about the behavior of these innovative geo-technologies for soft soil sites. It provides the final installation of a ten-year post construction monitoring project to evaluate the performance of the innovative embankment/foundation systems used on this project: (1) one-stage MSE wall over lime cement column treated foundation, (2) two-stage MSE wall with PV drain installation and surcharging, (3) expanded polystyrene (geofoam) embankment with tilt-up panel fascia walls, and (4) large earthen embankments, also with PV drain installation and surcharging. Long-term settlement monitoring has shown that the surcharging strategy used by the contractor has not always limited large MSE walls and earthen embankments to the 3 inches of postconstruction settlement in a ten-year period. Some areas using these technologies have experienced about 6 inches of post-construction settlement. Geofoam embankments have met the internal creep strain tolerances established by the design. However, larger than anticipated foundation settlement measured at two locations shows that caution is warranted in both the design and construction of adjacent and overlying fill, so as not to induce unintentional settlement in the underlying foundation soil. The lime cement column technology has reduced the total settlement (i.e., construction and post-construction) to less than 10 inches in a 10-year period and the post-construction settlement to about 2.5 inches.
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