山区高速公路特殊软基段处理

Soft Soil Treatment for Special Mountainous Expressway Sections

以江罗高速公路为例,介绍软基工程施工前设计补勘的作用,以及采用换填法、排水板+反压护道法、换填+抛石挤淤联合处治法等对不同路段软基处理效果的分析。施工前通过静力触探方法补勘,详细了解地质情况,选择不同段落不同地质的处理方法。实践表明,以上三种方法均适用于山区公路软基处理,其中换填法处理效果较好,且具有施工方便、速度快、材料充足、对周围环境影响小和工程造价低等优点。

Taking Jiangluo Expressway as an example,in this paper,the function of the design reconnaissance before the construction of soft foundation has been introduced. The effects of various treatment（ including replacement,drainage plate ＋ reverse pressure,combination method of replacement riprap） based on different sections of soft foundation have been analyzed. Through the reconnaissance of static cone penetration before construction,we can learn the geological condition in detail and optimize the most suitable treatment corresponding to the geological situation of different sections of expressway. This analysis has shown that these methods mentioned above could all be applied to treatment of soft foundation in mountainous expressway, especially the method of replacement. The method of replacement has the advantages of convenient construction, shorter construction period, adequate supple, less environmental effect and lower cost of construction.