Accession Number : ADA134343

Title :   Analytical and Experimental Investigation of Soil Reinforcing.

Descriptive Note : Final rept. 1 Jan 81-30 Jun 82 on Phase 1,


Personal Author(s) : Holtz,R D ; Harr,M E

PDF Url : ADA134343

Report Date : Oct 1983

Pagination or Media Count : 142

Abstract : Significant improvements in the capacity and service life of reinforced earth structures require an improved understanding of the fundamental behavior of these systems. Both experimental and analytical investigations were carried out to develop models for the interaction of geotextile-type reinforcement and granular soils. Reinforcement configurations and systems investigated were thought to be applicable to alternate launch and recovery surfaces (ALRS). Model ALRS systems using geotextiles and geogrids as reinforcement were tested in the laboratory in a variety of configurations. These were loaded to failure, quasi-statically, by both plane strain and axisymmetric rigid plates. Load-deformation characteristics as well as the shape of the deflected basin are reported. Significant increases in bearing capacity and modulus of subgrade reaction as a function of depth and number of layers of reinforcement were observed. However, there was a decrease in improvement as the depth to the first layer increased. Edge fixity conditions were found to be relatively unimportant, and the benefit of multiple-reinforcement layers was greater if the depth and spacing were small compared to the diameter of the loaded area. Surprisingly, little difference was observed in the response of the geogrids and geotextiles, probably because sand was used in the experiments. Geometric scaling of bearing capacity, based on the diameters of the loaded areas, was not possible.

Descriptors :   *Soils, *Textiles, *Reinforcing materials, Roads, Walls, Structures, Interactions, Loads(Forces), Bearing strength, Test methods, Mathematical prediction

Subject Categories : Soil Mechanics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE