作　　者： ; ; ;

机构地区： 浙江海洋学院船舶与建筑工程学院土木工程系

出　　处： 《建筑科学与工程学报》 2011年第1期42-48,共7页

摘　　要： 根据挤土分区模型,建立了饱和土中考虑孔压消散的桩侧非均质挤土区桩竖向振动简化计算模型;通过分离变量方法,得到了桩竖向振动频域解析解和时域半解析解,分析了挤土区对桩竖向振动特性的影响。数值计算结果表明:挤土区当量半径和桩周孔压增量比越小,桩周土对桩的约束作用越强;挤土区的存在使桩土间的相互作用减弱,采用均质土完全粘结模型过高地估计了土对桩的约束能力,实际工程中尽早开展挤土桩小应变反射波检测有利于获得较大的测试深度。 A simplified calculation model for vertical vibration of compation pile considering the inhomogeneous compaction zone of soil in the vicinity of the pile disturbed by pile driving was established.An analytical solution was deduced in frequency domain by means of variable separating method and then a semi-analytical solution in time domain was obtained using numerical convolution method.Numerical calculation results from the frequency domain and time domain indicate that the equivalent radius of compaction zone has major effect on pile dynamic response,as well as the ratio of exceeding pore pressure.It can also be concluded that the actual interaction of pile and soil will be weaken due to the compaction zone caused by pile driving,a fact can be deduced that the interaction of pile and soil is overestimated under the ideal undisturbed model.The presented model can reflect the interaction of pile and soil better than the perfect contact model.Small strain reflected wave test of compaction pile can be conducted as soon as possible in order to obtain greater depth of pile test in practical engineering.

关 键 词： 岩土工程 桩土相互作用 竖向振动 饱和土 孔压 挤土桩

领　　域： [建筑科学] [建筑科学]