深海水下导管架钢管桩可打性实例分析

A Case Study of Driveability of Offshore Jacket Steel Pipe Pile under Deep Water

利用波动方程可打性分析方法对我国东海海域水下导管架钢管桩的沉桩可能性进行了计算和分析,模拟了钢管桩在打桩过程中桩-土-锤系统的性能及桩的运动和受力状况,得到了如锤击数、打桩阻力、承载力、桩身压、拉应力、锤击能量等一系列参数,并选择了最佳的打桩锤,制定了合理的沉桩标准以及估计了总的打入时间。这些成果为设计部门和沉桩作业部门提供了重要的计算依据和控制参数。波动方程可打性分析方法既考虑了桩土的静力作用,又考虑了桩-土-锤系统的动态效应,对我国深海水下大直径钢管桩的设计和施工大有裨益。

A case study of piling capability analysis for offshore jacket steel pipe piles under deep water in the East China Sea was presented in this paper. Based on the wave equation driveability analysis and computation,the performance of pile-soil-hammer system and the loading condition of pile movement during driving were described; a series of parameters were obtained,such as blow counts,bearing capacity,soil resistance to driving,compressive stress,tensile stress,transfered energy,etc; a total driving time was estimated; a best hammer was chosen and then a rational installation criterion was formulated. The result can provide a powerful technical support and important data for the designers and piling contractors to assure a successful piling. Both the static effect of pile-soil and the dynamic response of pile-soil-hammer system were involved in the wave equation driveability analysis. Therefore,it is a beneficial and practical tool for the design and construction of offshore large-diameter steel pipe pile under deep water in China.