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通过现场试验对天然地基和CFG桩复合地基动力特性和时程响应进行了研究。分析了天然地基和CFG桩复合地基在空载情况下一阶频率变化规律。单桩复合地基和九桩复合地基时,分别在静载和爆破情况下,对CFG桩复合地基动力特性和时程响应进行了分析。研究了爆破激振作用下,单桩复合地基和九桩复合地基水平方向位移的变化规律。分析了CFG桩在不同荷载条件下一阶频率的变化规律;在相同爆破激振条件下,峰值加速度的规律。为今后探讨动力荷载作用下CFG复合地基的承载力和变形特性提供了研究基础。
The dynamic characteristics and time-history response of natural foundation and CFG pile composite foundation were studied through field experiments. The first-order frequency variation of natural foundation and CFG pile composite foundation under no-load condition was analyzed. Single pile composite foundation and nine composite foundation, the dynamic characteristics and time-history response of CFG pile composite foundation are analyzed under static load and blasting respectively. The variation of horizontal displacement of single pile composite foundation and nine composite foundation under blasting vibration was studied. The variation law of the first order frequency of CFG pile under different loading conditions is analyzed. The law of peak acceleration under the same blasting excitation condition is analyzed. It provides the basis for future study on the bearing capacity and deformation characteristics of CFG composite foundation under dynamic loads.