Call number:
ZSP-202-66
In:
Research report / Cold Regions Research and Engineering Laboratory, 66
Description / Table of Contents:
Summary: A simple theory is proposed for crack formation and development by soil desiccation on the basis of laboratory experiments utilizing soil samples (Bloomington till) with max particle size of 1 mm diam. held in flat wooden containers. The crack pattern is more dependent on the thickness of the soil sample than on temperature or humidity. Some effect is caused also by differences in the bottom material of the containers. The area of cells made by crack patterns has a log normal size distribution. Total length of cracks decreases with increase in sample thickness. The number of sides of cells also depends on the thickness. Cracking was found to begin from the center of the soil layer and to propagate to the surface or bottom with non-uniform speed.
Type of Medium:
Series available for loan
Pages:
vi, 48, A4 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 66
URL:
https://hdl.handle.net/11681/2755
Language:
English
Note:
CONTENTS
Preface
Summary
Introduction
Soil material
Soil
Preparation of the soil material
Containers
Temperature and humidity of the air
Moisture content and dry density of the soil
Experimental procedures and results
General procedures
Definition of the characteristics of cracking of soil
Cracking moisture content
Size of cells made by cracking of the soil
Length of cracks
Number of sides of cells
Development of cracks
Additional experiments
Interfacial fracture markings
Method of auxilliary tests on physical properties of the soil
Elastic constants of the soil
Shrinkage of soil due to desiccation
Tests of the adhesion between the soil and the bottom material
Results of auxiliary tests
Elastic constants of the soil
Free shrinkage process of the soil due to desiccation
Adhesion between the soil and glass or wood
Mechanism of crack formation due to the desiccation of soil
Geometric interpretation
Mechanical interpretation
Conclusions
References
Appendix: Table of experiments
Location:
AWI Archive
Branch Library:
AWI Library
