后压浆桩基础的承载力试验对比分析

摘要

According to the results of the stress test of four test piles in an extra-long bridge experimental zone, the paper analyzed the bearing capacity and the changes of settlement of conventional piles and post-grouting piles. The results show that under the same geological conditions, post grouting at the tip of bored pile could enhance the ultimate bearing capacity of single pile by improving the bearing capacity both at the tip and on the sides, and di-minish the settlement, which optimizes the pile foundation.%　　结合陕西省高速公路工程某特大桥试验区4根试桩的应力测试结果，对比分析常规桩和后压浆桩的承载性能以及沉降量的变化情况。试验结果表明，在相同地质条件下，钻孔灌注桩桩端后压浆可以通过改善桩端和桩侧承载性能，从而提高单桩极限承载力，减小沉降，达到优化桩基础的目的。