打桩作用下高桩码头岸坡稳定可靠度分析

Reliability analysis on stability of wharf slopes during pile driving

系统分析了打桩对高桩码头岸坡稳定的不利影响,研究了沉桩过程中孔隙水压力的分布,结合边坡稳定分析中的简化Bishop法建立极限状态方程,考虑土性参数相关性按JC法计算可靠度指标,编制了计算程序。对南通某港打桩时码头的岸坡稳定可靠性进行分析,结果表明:打桩会对岸坡稳定产生不利影响。考虑到打桩作用时岸坡稳定安全系数明显降低,可靠度指标也会降低,建议对工程中打桩时码头岸坡稳定进行验算。

We analyze the disadvantageous effect of pile driving on the slope stability of piled wharf, study the distribution of pore water pressure during piling construction, and establish the limit state equation combining with the predigested Bishop method on slope stability analysis. Considering th,： pertinence of earth parameters, we design the calculation program of the reliability index according to JC method. The analyzing result of the wharf slope stability reliability of Nantong port during pile driving shows that piling will bring about disadvantageous effect on the slope stability, and the safety factor and reliability index reduce evidently. It is suggested to carry out checking calculation to the wharf slope＇s stability during piling.