Improving Embankment Design and Performance:An Examination of the Variability Resulting from Soil Compaction.

摘要

A glacial silty clay was studied to determine what variables control laboratory impact-compacted density and strength and their variabilities. Additionally,the laboratory data were examined statistically as possible predictors of field results. Density and strength are controlled by moisture content and density,respectively,as well as by interactions between variables (i.e.,one-on-one relations between variables are not adequate to define the dependences). The variabilities are controlled by the magnitudes of density or strength as well as by interactions between variables. Results of limited field sheepsfoot compaction of the same soil show relationships very similar to those from the laboratory;the field variabilities are,however larger. Enough field data were not available to develop reliable field compaction relationships. However a prediction technique was developed,using laboratory data that should ultimately be applicable for field data. The designer selects the strength he wishes for the compacted soil,and the variability he will accept;the technique tells him what density,moisture content,and energy to specify for compaction of that soil using a specific type of compaction. Appropriate field data are now being collected to demonstrate this technique for field compaction predictions.