Thickness Requirements for Soils Beneath Landing Mats; Bare Base Support

摘要

The study reported herein is one phase of the research program being conducted at the U.S. Army Engineer Waterways Experiment Station for the purpose of developing a method for determining thickness requirements for landing-mat-surfaced, membrane-surfaced, and unsurfaced airfields. The phase of the program presented in the report pertains to the development of a method for determining thickness requirements of soil strengthening layers for landing-mat-surfaced airfields. Five landing-mat-surfaced test sections were constructed and tested. The subgrades of the test sections consisted of heavy clay (1.3 to 3.7 CBR) of various thicknesses. The same material placed at a higher strength (3.0 to 8.0 CBR) was used as a strengthening layer between the landing mat and subgrade. Test section I was surfaced with M8A1 landing mat; test sections II, III, and IV were surfaced with XM18 landing mat; and test section V was surfaced with AM2 mat. (Author)