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ESTIMATION OF EQUIVALENT CALIFORNIA BEARING RATIO WITH RESPECT TO TESTING SURCHARGE WEIGHTS FOR CLAYEY SOIL
| 题名： | ESTIMATION OF EQUIVALENT CALIFORNIA BEARING RATIO WITH RESPECT TO TESTING SURCHARGE WEIGHTS FOR CLAYEY SOIL |
| 正文语种： | eng |
| 作者： | BISWABIKASH ROUT;ASHUTOSH SAT;V. GOVINDARAJ |
| 作者单位： | R&D L&T Construction Chermai;R&D L&T Construction Chermai;R&D L&T Construction Chermai |
| 摘要： | The subgrade is the foundation for construction of any type of pavement. The performance of the pavement is directly related to the performance of the subgrade layer. The construction of a durable subgrade layer depends on various factors like nature of soil, moisture content, field compaction etc. The strength of subgrade material is usually determined by the California Bearing Ratio (CBR) test. The 96 hours soaked CBR test results are widely used to calculate the Resilient Modulus values for subgrade layers, which is used as an input for pavement crust thickness design. The CBR test is performed as per IS 2720 Part 16, the samples for which are prepared using maximum dry density and optimum moisture content obtained as per IS 2720 Part 8. The CBR test results primarily depend on nature of soil, percentage compaction, initial moisture content, soaking period and surcharge weights used during soaking and testing. IS 2720 Part 16 stipulates usage of surcharge weights equal to weight of base material and pavement layers expected or existing over the subgrade. This surcharge weight for typical highway flexible pavements varies in the range of 15-25 kg, but traditionally surcharge weight of 5-7.5 kg have been used to determine the CBR results, especially during tendering and design stages, where the crust thickness are unknown. This paper presents a brief study on effect of compaction, moisture content and surcharge weights on CBR of clay soil. The authors also propose empirical correlations to convert the tested CBR value of clayey soil to equivalent CBR values at different surcharge weights. |
| 出版年： | 2021 |
| 期刊名称： | Indian Highways |
| 卷： | 49 |
| 期： | 7 |
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