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https://hdl.handle.net/11681/10958| Title: | Methods used in tieback wall design and construction to prevent local anchor failure, progressive anchorage failure, and ground mass stability failure |
| Authors: | Innovations for Navigation Projects Research Program (U.S.) Strom, Ralph W. Ebeling, Robert M., 1954- |
| Keywords: | Anchor failure Anchored wall Ground mass stability Tieback wall Bulkheads Retaining walls Design Construction |
| Publisher: | Information Technology Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | ERDC/ITL TR 02-11. |
| Description: | Technical Report Abstract: A local failure that spreads throughout a tieback wall system can result in progressive collapse. The risk of progressive collapse of tieback wall systems is inherently low because of the capacity of the soil to arch and redistribute loads to adjacent ground anchors. The current practice of the U.S. Army Corps of Engineers is to design tieback walls and ground anchorage systems with sufficient strength to prevent failure due to the loss of a single ground anchor. Results of this investigation indicate that the risk of progressive collapse can be reduced by using performance tests, proof tests, extended creep tests, and lift-off tests to ensure that local anchor failures will not occur and to ensure the tieback wall system will meet all performance objectives; by using yield line (i.e., limit state) analysis to ensure that failure of a single anchor will not lead to progressive failure of the tieback wall system; by verifying (by limiting equilibrium analysis) that the restraint force provided by the tieback anchors provides an adequate margin of safety against an internal stability failure; and by verifying (by limiting equilibrium analysis) that the anchors are located a sufficient distance behind the wall face to provide an adequate margin of safety against external stability (ground mass) failure. Design measures that can be used to protect against local anchor failure are described, along with testing methods that can be used to ensure that anchor performance meets project performance objectives. Examples are given to demonstrate the yield line analysis techniques that are used to verify that the wall system under the failed anchor condition can safely deliver loads to adjacent anchors and to ensure that the failure of a single anchor will not lead to progressive wall failure are. Limiting equilibrium analysis procedures used for the internal and external stability of tieback wall systems are also described. Simple procedures applicable to dry homogeneous sites and general-purpose slope stability programs applicable to layered sites (with and without a water table) are also illustrated by example. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/10958 |
| Appears in Collections: | Technical Report |
