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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.
In this paper, FLAC3D is used as a calculation tool to analyze the dynamic response of the natural foundation of a confined beach in Jiangsu and the composite foundation reinforced by gravel piles. The change of pore water pressure under the action of earthquake and the change of the gravel pile Length and spacing of piles, pile diameter and other design parameters on dissipation of pore-water pressure and control of liquefaction.The analysis results show that the excess pore-pressure ratio can be used as the basis for the determination of liquefaction of foundation soil.In order to meet the liquefaction resistance and engineering Economic requirements, long and short pile spacing can be used to control the spacing of the pile and the combination of different pile diameter and other measures.The results obtained in this paper can provide reference for the design and construction of similar projects.