面波法检测地基波速中振源与测点的布置方法  

ON ARRANGEMENT OF EXCITATION AND TRANSDUCERS IN SURFACE WAVE MEASUREMENT

作　　者：陈龙珠[1] 严细水[2] 宋春雨[1] 

机构地区：[1]上海交通大学建筑工程与力学学院,上海200030 [2]浙江大学防灾工程研究所,杭州310027

出　　处：《工程力学》2003年第5期174-178,154,共6页Engineering Mechanics

基　　金：国家自然科学基金会资助项目(50079027)

摘　　要：在地面竖向简谐集中力作用下,利用轴对称有限元-无限元耦合模型计算了地表动力响应的相频特性,并由此系统地考察了由两点相位差确定R波速度的影响因素及其规律性。对匀质弹性地基的研究结果表明,为保证由不作P波和S波滤波处理的实测地表信号相位差求出的R波速度具有足够高的精度,点-源距和测点间距必须满足一定的要求;对高饱和度地基及当测点间距较小时,目前对振源和测点布置的常见做法会使检测结果出现较大的误差。结论对地基波速检测的面波法现场工作方法具有重要的指导意义。Using the finite element method coupled with three kinds of infinite elements for the axisymmetrical dynamic solutions of vertical displacement at surface of a homogenous semi-infinite ground under a vertical harmonic excitation, the variation of its phase angle with distance from the excitation as well as the R-wave velocity calculated through the phase angle difference between two measuring points at any spacing interval are investigated in this paper. It is shown that arrangement of source and receivers has significant effect on results of the surface wave measurement or SASW testing, especially for soils with high Poisson抯 ratio or saturated soils. Larger source-to-receiver distance and receiver spacing interval usually give better results, and it is unnecessary to keep them equal. To satisfy error control requirement in the measurement, some corresponding minimum values of source-to-receiver distance and receiver spacing interval are also proposed for different Poisson抯 ratios of soil.

关 键 词：地基基础工程 面波法 SASW法 瑞利波 测点布置 

分 类 号：TU435[建筑科学—岩土工程]