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|Title:||Investigation of beach sand trafficability enhancement using sand-grid confinement and membrane reinforcement concepts. Report 1. Sand test sections 1 and 2|
|Authors:||Webster, Steve L.|
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-79-20 rept.1.|
Abstract: Containerization of Army cargo for use in overseas theater of operations is progressing. The discharging of containers from containerships and moving them across beaches in logistic over-the-shore operations is a problem that the Army must be capable of handling. The objective of this study was to investigate sand-grid confinement and membrane reinforcement concepts for possible application in moving containers over unstable beach sands using wheeled vehicles such as the XM 878 truck tractor and XM 872 semi trailer. In particular, it was desired to determine the optimum grid cell size and minimum surfacing requirements for handling the over-the-shore container operations. A secondary objective was to test the potential use of buried membrane as expedient means for enhancing truck-semitrailer trafficability over beach sands. Two test sections containing a total of 14 test items were constructed and subjected to truck traffic . The tests included three membrane reinforcement items, 10 sand-grid confinement items, and one control item. Also tested in conjunction with the test items were four expedient-type surfacings. Test results showed that aluminum grids with a 6-in. cell size, 8 in. thick, filled with an unstable type beach sand, and surfaced with a spray application of SS-1 emulsified asphalt withstood 5000 passes of heavy truck traffic with less than 2 in. of permanent depression at the grid surface. Results also showed that two layers of T-17 membrane buried in unstable sand at 1- and 5- in. depths, respectively, and anchored from side pull-in can increase the trafficability of a loaded truck from 10 pusses to more than 3500 passes before an 11-in. rut develops.
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