| Title |
Characteristics of the Expanded Road Embankment Constructed by Lightweight Air-Mixed Soils for a Short-Term |
| Keywords |
lightweight air-mixed soils;expanded road embankment;unconfined compressive strength;capillary rise height;settlement;경량기포혼합토;확포도로성토체;압축강도;모관상승고;침하량 |
| Abstract |
This study was conducted to find out the characteristics of the expanded road embankment constructed by the lightweight air-mixed soil (slurry density 10 kN/㎥) for a short-term without any ground improvement. Compression strength, capillary rise height of the lightweight air-mixed soil and settlement behavior of soft ground were studied. Compression strengths of the specimens sampled at the site after 1 and 5 months of construction were all satisfied the required strength 500 ㎪. However, it was not convinced the homogeneity construction, because the values of strength were depending on the sampled location. Also, strength difference between laboratory and site specimens were found about 19%, and thus it should be considered for mixing design. Capillary rise reached about 20 em for 70 hours because of a numerous tiny pores existed inside the lightweight air-mixed soil. Relationship between settlement and time of the soft ground placed underneath the expanded embankment was estimated by using the measured data and back analysis technique. The current average consolidation ratio and the final settlement after 120 months later were estimated about 32% and 4.5cm, respectively. This settlement is much less value than the allowable settlement 10㎝ for this structure. |