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为研究桥梁桩基后压浆对桩基础承载性能的影响,通过采用MARC有限元软件,对后压浆桩基础的承载性能进行仿真分析和现场桩基静载试验,对压浆桩与未压浆桩的桩侧摩阻力、桩端阻力的性状进行了对比分析。有限元数值仿真分析说明,桩周浆体与桩底土体在自身压缩模量增加和桩侧摩擦系数增大的共同作用下,能够明显增大桩体承载力。现场试验数据显示,后压浆桩较未压浆桩的桩基荷载传递减缓,各级荷载的沉降减小,沉降稳定较快;桩侧阻力及桩端阻力发挥充分,增长速度快。结果表明:采用后压浆技术,能够明显减小桩基沉降量,并可有效提高桩基承载力。
In order to study the influence of post-grouting on the bearing capacity of pile foundation, the bearing capacity of post-grouting pile foundation was simulated and the static pile foundation test was conducted by using MARC finite element software. Pile side of the pile friction resistance, pile end resistance traits were analyzed. Finite element numerical simulation shows that the pile body can significantly increase the bearing capacity of piles under the combined action of the increase of self-compressing modulus and the increase of friction coefficient of pile-side soil. Field test data show that the post-grouting pile is slower than the un-grouting pile pile load transfer, load settlement at all levels to reduce the settling faster; pile side resistance and pile end resistance to fully play, the growth rate is fast. The results show that the post grouting technology can significantly reduce the settlement of pile foundation and can effectively improve the bearing capacity of pile foundation.