砂土地震液化判别及碎石桩加固设计参数优化

Evaluation of Earthquake Liquefaction of Sand Soil and Optimization of Design Parameters Gravel Pile

本文运用FLAC3D作为计算工具对江苏某滩涂匡围工程的天然地基和采用碎石桩加固的复合地基进行动力反应分析,探讨了砂土地基在地震作用下的孔隙水压力的变化和碎石桩桩长、桩间距、桩径等设计参数对消散动孔隙水压力、控制液化的影响.分析结果表明:超孔压比可以作为地基土液化的判别依据;为满足碎石桩的抗液化性能和工程经济性要求,可采用长短桩间隔布置、控制桩间距以及不同桩径相结合等措施.本文取得的成果可为同类工程的设计建设提供参考.

Through analyzing dynamic response to natural foundation and stone column composite foundation of a beach polder project in Jiangsu province, China, this paper discusses the changes in pore water pressure of sand foundation under earthquake action and the influence of stone columns design parameters on anti-lique- faction and dissipating pore water pressure. The results show that the excess pore pressure ratio can be used as criterion for determining soil liquefaction. Combining the pile length, controlling pile spacing and adopting different pile diameters, etc. measures can meet columns＂ anti-liquefaction performance and techno-economic requirements. The results can provide a reference for the design and construction of similar proiects.