挖孔桩在朝阳至黑水高速公路中的应用

Application of Excavation Pile in Chaoyang-Heishui Expressway

丹东至锡林浩特高速公路朝阳至黑水(辽蒙界)段,桥梁基础地层多属于较密实地层且地下水不发达,地质结构稳定,不易产生坍孔,特别适合采用人工挖孔。我们通过钻孔灌注桩和人工挖孔灌注桩的设计理论、施工工艺、工程造价的比较,在工程地质条件允许,优先考虑采用人工挖孔灌注桩方案,取得了良好的经济技术效益。

The stratum of bridge foundations in Chaoyang - Heishui （ boundary of Liaoning and Inner Mongo- lia） section of Dandong to Xilinhaote Expressway are mosdy compact stratum with stable geologic framework and lacking of groundwater, which is not likely to produce hole collapse in construction and is suitable for manual exca- vation. After comparison of design theory, construction techniques and construction cost of cast - in - place pore pile and artificial excavated pore - pile, we found out that if the engineering geology conditions are suitable, artifi- cial excavated pore -pile method will bring better economic benefits.