Geotechnical Characterization of Soil in Cagayan de Oro Riverbank within Barangay Balulang and Macasandig after the Flashflood Incident Brought by Typhoon Sendong
The aim of this study is to determine the depth and geotechnical characteristics of new and old soil deposits after typhoon Sendong hit the city. Twenty-nine soil samples from 16 observation sites were taken along the riverbank near Brgy. Balulang and Macasandig, as these areas were seriously damage during typhoon. The results of geotechnical testing shows that for the new deposit, Liquid Limit value ranges from 0% to 35%, Plastic Limit from 0% to 46% and with corresponding Plasticity Index of 0% to 8.8%. Specific Gravity ranges from 2.65 to 2.99 and moisture content from 3.08% to 76.09%. Maximum Dry Density, Optimum Moisture Content and Field Density vary from 10.75kN/m3 to 16.59kN/m3 , 19.22% to 31.25% and 8.71kN/m3 to 13.02kN/m3 , respectively. On the other hand, for the old deposit have Liquid Limit ranges from 0% to 46%, Plastic Limit from 0% to 39% and Plasticity Index from 0% to 10.5%. Specific Gravity ranges from 2.65 to 2.98 and Moisture content vary from 4.76% to 46.78%. Maximum Dry Density and Optimum Moisture Content vary from 12.78kN/m3 to 15.47kN/m3 , 20.38% to 41.0%, respectively. The depth of new deposit ranges from 0.20m - 1.30m. Because of their non-plastic behavior, most of the new deposits as well as the old deposits have low swelling potential but have high collapsibility potential. Therefore, these deposits are expected to lose its strength upon saturation. The compendium will serve as a preliminary forecast and reference guide for the future civil engineering works and construction with respect to the geotechnical characterization of soil along the Cagayan de Oro River.