后注浆超长大直径灌注桩承载性能试验研究

以软土地区桥梁桩基础为工程依据,进行了普通和后注浆超长大直径灌注桩的静载试验和桩身轴力测试,对比分析了普通灌注桩和后注浆灌注桩的承载性状,发现在软土地区后注浆技术能有效地改善超长大直径灌注桩桩端和桩侧土层特性,增加桩侧摩阻力和桩端阻力,使单桩承载能力得到明显提高,此项试验研究可为软土地区的类似工程提供参考和借鉴。

Studies of Post Grout on the Axial Capacity of Large Diameter Long Bored Piles

The comparative studies on the large diameter, long bored piles in soft soils with and without post grouting are pres- ented in this paper. Based on the instrumented static load test results on both types of piles, it is concluded that the post grou- ting can effectively improve interaction between pile and adjacent soils. Therefore, the capacity of both end bearing and side friction is obviously increased.