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|Description:||Base friction tests involved application of several increments of horizontal wall displacement towards the backfill without allowing vertical displacement. The concrete backwall specimen T5.5 rested directly on native soil.More details on this test in section 5.1.1 of the final report.
The major interest of the test was the relationship between the total horizontal force applied to the wall and the corresponding horizontal displacement. A pretest was performed pushing the wall up to 1.0 inch without the backfill soil. Afterwards, the wall was moved up to a total displacement level of 7 inches under displacement control. Vertical movement of the test specimen was restrained. The load was applied cyclic while the unloading cycles were limited to a total displacement of max 1/10 of the current displacement level.The formation of cracks was monitored during the test and the backfill soil was excavated after test completion in order to investigate the failure plane. The use of drilled gypsum columns at several distances behind the wall reveals an accurate determination of the major and minor failure planes and their locations. The maximum horizontally applied force was reached at a displacement level of 1.96 inches and measures 486.25 kips.
|Dates:||July 17, 2006 - July 17, 2006|
|Facility:||University of California, Los Angeles, CA, United States|
Sensor Placement for Pretest
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