| Title |
Computing Procedure of Daily Average Air Temperature using Field Data and Frost Index Calibration for Anti-Frost Heave Layer Design |
| Keywords |
freezing index;calibration;frost depth;daily average air temperature;anti-frost heave layer;동결지수;보정;동결깊이;일평균 대기온도;동상 방지층 |
| Abstract |
The frost depth(frost penetration) is used to install anti-frost heave layers in pavement designs. The freezing index is calculated by an annual accumulated value of multiplying the period of time with temperatures below zero, and the corresponding temperature. Therefore, the DAAT(daily average air temperature) calculation method may play an effect on the FI(freezing index). The Weather Observatory used to supply 4 average air temperatures per day, but currently supplies 8 per day. With this study, we divided the southern part(below FI=350°Cㆍday) of the Korean peninsula into 6 areas according to site conditions(low embankment, embankment-cutting slope, and the cutting slope) and established a field measurement system for 15 positions to check the effects on the result of PI according to differing DAAT calculation methods. The air temperatures obtained by the field measurement system was used to calculate and compare the FI. As a result, the freezing index calculated based on the DAAT₄(T₄) is normally greater by 3% than the one on DAAT?(T?). In addition, the calibration equation for the freezing index using air temperatures was proposed through the research. |