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| Design and Construction Experiment of Collapsibility Loess Subgrade in Dayun Expressway |
| SUN Ai-bin, WU Lian-hai |
| The Third Railway Survey & Design Institute, Tianjin 300251, China |
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Abstract Research purposes: On the basis of the fact that the ground condition of the area where Houma-Yuncheng section of Dayun expressway runs across in Shanxi province is mainly of collapsibility new loess, the paper researched the problems including the slope and drainage designs and the treatment methods for collapsibility new loess.
Research methods: According to the real situation of Houma-Yuncheng section and in combination with the research achievements at home and abroad and current state codes, the subgrade slope and drainage were designed specially based on the analysis of the geological, topographical and hydrological conditions and the integral comparisons of technology and economy. And the new loess subgrades with various collapsibility were treated using different measures, such as mechanical roller compaction, heavy tamping consolidation and dynamic compaction etc.
Research results: A set of successful design experience and a series of technical researches were presented.
Research conclusions: The results of construction experiment and traffic practice proved that the treatment methods used for the collapsibility new loess subgrade in this expressway were reasonable and feasible. Moreover, the treatment methods also provided valuable experience of subgrade design and treatment for this area or those with the same type of loess in future.
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Received: 26 May 2006
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2006, Vol. 23 
