抄録
In situ investigation of the soil characteristics offers significant promise for providing a reliable and economical method for obtaining strength and stiffness characteristics associated with pavement design. The investigation of the compressibility and compaction properties of a layer of soil below subgrade of an internal road was carried out in Salt lake campus of Jadavpur University. A cut section of 990 mm depth below existing ground level (EGL) was prepared for subgrade of that internal road construction. The characteristics of top subgrade soil are silty sand and foundation soil below subgrade is silty clay to clayey silt in nature upto a substantial depth. Field tests reported in this paper were carried out by flat dilatometer, field CBR using loaded reaction truck and truss both. Dynamic cone penetrometer(DCP) test was also done for a preliminary research program for evaluation of newly compacted subgrade support characteristics. Flat dilatometer (DMT) was used to determine the different properties and moduli of foundation soil below the subgrade and also field CBR, DCP and field compaction tests were carried out to determine the bearing strength and compaction properties. After completion of numerous dilatometer investigations the box was excavated in the field allowing for conducting field CBR test at different depth below the subgrade. Field and DCP CBR versus dilatometer index are plotted for moisture and density variations at different depth.
