大运高速公路湿陷性黄土路基设计和施工试验

Design and Construction Experiment of Collapsibility Loess Subgrade in Dayun Expressway

研究目的:针对山西省大运高速公路侯运段所经地区主要为湿陷性新黄土地基的特点,对该线路基边坡及排水设计和湿陷性新黄土地基处理方法进行研究。研究方法:根据该线侯运段的实际情况,结合国内外研究成果和国家现有规范,在分析该线地质、地形和水文条件,进行综合技术经济比较后,对路基边坡和排水进行个别设计,针对不同湿陷性程度的新黄土地基采用了机械碾压、重锤夯实、强夯等多种工程措施进行处理。研究结果:得出了一套成功地设计经验和一系列有针对性的技术措施。研究结论:经施工检验和通车运营后的验证,在该线湿陷性新黄土路基设计中采用的机械碾压、重锤夯实、强夯等多种处理措施是合理的、可行的。这些措施为今后该地区或相同类型的黄土地区进行路基设计和地基处理提供了可供借鉴的经验。

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.