| Title |
A Study on CBR Characteristics of National Highway in Yeongnam Region |
| Authors |
박영목(Park, Yeong-Mog) ; 이고현(Lee, Go-Hyeun) ; 김낙석(Kim, Nak-Seok) ; 조규태(Cho, Gyu-Tae) |
| DOI |
https://doi.org/10.12652/Ksce.2016.36.3.0535 |
| Keywords |
자연함수비;No. 200체 통과율;최적함수비;최대건조밀도;영남지역 CBR;Natural water content;No. 200 seive passing;Optimum moisture content;Maximum dry density;Yeongnam region |
| Abstract |
This study has been carried out to evaluate the CBR characteristics and the correlations among every soil properties of National road in Yeongnam region. Total of 480 soil samples were collected from 41 administrative districts for more than 30 years. Their physical and mechanical properties such as natural water content, the Atterberg limit, No. 200 sieve passing, the compaction test and the CBR test results were involved. The soils in Yeongnam region, SM, SC, SP and CL by USCS have predominated approximately 79%. The test results show that average CBR values of gravel and sand range from 12.7% to 20.3% and those of silt and clay range from 4.8% to 7.1%. It means that average CBR values of fine grained soils are less than a half of coarse grained one. Natural water content, No. 200 sieve passing, optimum moisture content and maximum dry density of soils are well correlated with CBR values. Especially, it presents that No. 200 sieve passing is the best correlation factor with CBR value. If consider the partition off this region into 6 zones of classified by mother rock, the correlation between CBR value and every soil properties tends to increase. It is suggested that tables, figures and the regressions described in this paper may be available for designers and engineers to understand the characteristics of an embankment materials in Yeongnam region. |