考虑超静孔隙水压力的大直径桩可打性分析

Drivability Analysis of Large Diameter Pile Considering Excess Pore Water Pressure

随着海上风电建设中大直径钢管桩的广泛应用,可打性分析在预判和解决沉桩施工技术难题及安全隐患上发挥重要作用。通过考虑超静孔隙水压力影响下桩周土体承载力变化的分析研究,提出可打性分析过程中土参数获取的新方式,并通过某海上风电大直径钢管桩的沉桩过程进行可打性分析应用,应用结果显示:可打性分析对桩承载力、桩身最大应力值、终锤贯入度等数据的预测均与实际测得值十分接近,验证考虑超静孔隙水压力的大直径桩可打性分析准确性较高,能为沉桩施工可行性提供科学性的技术指导。

With the widespread application of large-diameter steel pipe piles in offshore wind power construction,driveability analysis has played an important role in predicting and solving technical problems and safety hazards in pile sinking construction.By considering the analysis and research on the change of soil bearing capacity around piles under the influence of excess pore water pressure,a new method for obtaining soil parameters in the process of driveability analysis is proposed,and the pile sinking process of a large-diameter steel pipe pile in an offshore wind power plant is carried out.Application of driveability analysis,the application results show that the prediction of pile bearing capacity,maximum stress value of pile body,final hammer penetration and other data of driveability analysis is very close to the actual measured value,which verifies the consideration of excess pore water,The analysis of the driveability of large-diameter piles under pressure is more accurate,and can provide scientific technical guidance for the feasibility of pile sinking construction.