MODULUS 4.0, User's Manual

摘要

The MODULUS program, a modulus backcalculation system described in the report, has been developed by the Texas Transportation Institute for the Texas Department of Highways and Public Transportation. The system is intended to be used when analyzing data collected with only the Falling Weight Deflectometer. The following enhancements have been made in the version of the software: (1) Automatic calculation of a depth to a stiff layer (H4), which can be overwritten by the user (2) Automatic calculation of weighting factors for each sensor. (3) Detection of non-linearity in the subgrade, and automatic selection of the optimum numbers of sensors to use in the backcalculation process. (4) The use of the Corps of Engineers WES5 linear elastic program which is considerably faster than existing programs and has no copyright restrictions. (5) Inclusion of a routine to permit manual input of deflection bowl data. One minor restriction on the version of MODULUS is that four of the deflection sensors must be located at offsets of 0, 12, 24, 36 inches from the center of the load plate.