有轨电车一般路段软土地基处理技术研究

结合南京河西新城现代有轨电车工程,对线路一般路段软土地基所采用的三种不同的地基处理方法:挖除换填法、真空预压法和真空预压联合水泥土搅拌桩法的加固方式和施工工艺进行详细介绍。根据现场监测数据,分析了采用上述三种地基处理方法加固软基后工后沉降随时间的变化情况,结果表明:三种方法处理软基后的工后累积沉降值分别为15.8、13.2和8.6 mm,远小于设计允许工后沉降警戒值100 mm,可以看出,上述三种处理方法均有效加固了有轨电车一般路段软土地基,其中水泥土搅拌桩联合真空预压法的加固效果要优于另外两种方法。

Study on the soft soil improvement technologies of Rapid-Transit Tram

Based on the Rapid-Transit Tram Project in Nanjing, three soft soil improvement methods including replacement method, vacuum preloading method, as well as vacuum preloading combined with cement-soil mixing pile method were introduced in this paper.. The reinforcement method and the construction technology were reported in detail for the three methods. The post-construction settlement of the soft soil foundation reinforced by the three methods was investigated. It can be found that the post-construction settlements were 15.8 mm, 13.2 mm and 8.6 mm for replacement method, vacuum preloading method, and vacuum preloading combined with cement-soil mixing pile method respectively, which were much less than the cumulative alarm value of 100 mm. It can be concluded that these three improvement methods reinforced the soft soil foundation effectively, whereas the reinforcement effect of the vacuum preloading combined with cement-soil mixing pile method is better than the other two methods.