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Title:

EXPERIMENTS ON VIBRATORY CUTTING OF SOILS

Accession Number:

00233140

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

A SERIES OF SMALL-SCALE, LABORATORY INVESTIGATIONS ARE REPORTED COMPARING THE EFFECTS OF CUTTING SOIL AND SOIL-LIKE MATERIALS BY A COMBINATON STATIC-PLUS-OSCILLATORY LOADING WITH THE EFFECTS OF CUTTING BY A PURELY STATIC LOAD. THE CUTTING APPARATUS CONSISTS ESSENTIALLY OF A BLADE AND CUTTING HEAD TO WHICH IS ATTACHED A VARIABLE SPEED MOTOR THAT ROTATES A SMALL UNBALANCED WEIGHT AT FREQUENCIES UP TO ABOUT 100 CYCLES PER SECOND. THREE TYPES OF MATERIALS WERE INVESTIGATED, INCLUDING A SAND, A SILTY CLAY, AND AN ARTIFICIAL MATERIAL (PLASTICENE) RESEMBLING A CLAY IN SOME OF ITS PROPERTIES. THE MOISTURE CONTENTS OF THE SAND AND OF THE CLAY WERE VARIED; HOWEVER, THE TESTS ON THE SAND WERE GENERALLY CONDUCTED AT OPTIMUM MOISTURE CONTENT AND THE TESTS ON THE CLAY AT THE PLASTIC LIMIT. TEMPERATURE WAS FOUND TO BE AN IMPORTANT FACTOR IN THE TESTS USING PLASTICENE. THE MATERIALS WERE COMPACTED IN RIGID MOLDS BY THE USE OF A PROCTOR HAMMER. THREE TYPES OF SUPPORT OF THE CUTTING HEAD WERE INVESTIGATED, ONE HAVING A SINGLE DEGREE OF FREEDOM, ONE 3, AND ONE 6 (RESTRAINED ONLY BY A VERY "SOFT" SPRING SUSPENSION). THE TESTS WERE COMPARED ON THE BASES OF CUTTING DESPLACEMENT AND TIME. IN GENERAL, IT WAS FOUND THAT THE USE OF THE OSCILLATORY LOADING WAS ADVANTAGEOUS, THE ADVANTAGE RESIDING PRIMARILY IN THE CONSIDERABLE REDUCTION OF THE STATIC COMPONENT OF THE LOAD (REDUCTION IN WEIGHT OF CUTTING HEAD, I. E., IN STATIC FORCE REQUIRED TO PUSH THE CUTTING BLADE). /AUTHOR/

Supplemental Notes:

Vol 35, pp 714-724, 21 FIG, 9 PHOT, 3 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

01490392

Authors:

Ayre, R S

Editors:

Burggraf, Fred
Ward, Elmer M

Publication Date:

1956

Serial:

Highway Research Board Proceedings

Volume: 35
Publisher: Highway Research Board

Media Type:

Digital/other

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Aug 15 1971 12:00AM