大直径桩波动方程可打性分析及应用

摘要

利用波动方程分析程序模拟某超大跨海工程大直径钢管桩的打桩过程,并根据实际桩-土-锤系统参数进行可打性分析,确定桩-土-锤系统性能及桩的运动和受力状况.波动方程分析可采用不同的打桩锤模拟计算,得到锤击数、承载力、桩身拉应力和压应力结果.通过比较,选择最佳的打桩锤并制定合理的沉桩标准,估计总的打入时间.%On the basis of the wave equation analysis program,the driving process of a large-di-ameter steel pipe pile in a huge cross-sea bridge proj ect was simulated and analyzed in this paper. The drivability analysis of the pile was performed to determine the performance of a pile-soil-hammer system and the force condition of pile movement during driving and to provide feasible technical parameters for designers and piling contractors.Successful application of wave equation drivability analysis in this proj ect resulted in significant advantages in the design and construction of offshore piles.Various hammers can be used to simulate various piling conditions and obtain a series of parameters such as blow counts,bearing capacity,soil resistance to driving,compres-sive stress,and tensile stress.The best suited hammer can be chosen using this analysis and a ra-tional installation criterion can be formulated.The total driving time can also be estimated.