This paper presents a theoretical study on the ground vibration isolation cfficiency by multi-rows of piles as passive barricr in a three-dimensional context. Integral equations governing Rayleigh wave scattering are derived according to the Green's solution of Lamb problem. The integral equations are solved accuratcly and efficently with an iteration teehnique. They are used to predict the complicalled Rayleigh wave field that is generated by a number of irrcgular scatterets embedded in an elastic half-solid. The method is Vcrified with a numberial solution available in the literature for a simplified Rayleigh wave scatteing problem. Passive isolation effectiveness of ground vibration with two or three rows of small piles is further studied in detail Effccts of relevant parameters on the effectiveness of vibration isolation are analyzed and presented. 2006 Elsevier Ltd. All rights reservd.

Magnetic-levitating train is a new typa of ground transportation means. Tha first commerciai magnetic-levitation line in the world has been built in Pu Dong of Shanghai, China However, to the authors' knowledge, few tests and analyses about ground vibration and the influences on environment induced by actual magnetic-levitatlng train have been reported in the open literature. In this paper, the large-scale test results about the magnetic-train in Shanghai are reported. The characters of grand vibration and wave propagation induced by magnetic-train at different speeds are studied. The results indicate that the ground vibration by magnetic-levitating train is less than that caused by wheel-track train. The dramatic increase of ground vibration, which is existed in wheel-track train when the speed exceeds Raylaigh wave, was not found.

The propagation of Man-Made environmental vibration at near-field and far-field were expounded in the paper respectively. The near-field wave is mainly caused by source energy mechanism and the far-field wave energy is lost due to mainly the proporty of soft. Meanwhile real terrain is not perfectly smooth. The barders, the effective and the reliable measures, were used to control environmental vibration. It is a practical and conomical way. The beneficial result of the barriers only when the found theory of wave propagation and the theory of screening of baeders are reasonable plan. Theory of design and calculation of vertical and horizontal barriers and the cause that some barrier engineering which were designed in the screening inefficiency or anti-effictency caused by neglecting and mistmderstandthg the principle of shield of the battier were presented in the paper. The poablem of attached environmental vibration induced by barrier was installed which will change the frequency at the ground is also presented. These case histories, which have alredy been used effectively on controlling Man-Made environmental vibration by baffler, were reported in the paper.

从Lamb问题的基本解出发，通过对弹性波散射问题的积分方程进行复杂的数学变换和推导，得到了一个适合于瑞利波散射问题的积分方程的简单表达式，通过迭代求解这个表达式即可解决多个不规则异质体引起的瑞利波散射问题。实例证明本文方法收敛速度非常快，通常只需迭代3～4次即可得到精确的解答。

视桩为弹性半空间中的异质体，以瑞利波散射的积分方程为基础，首次对多排桩屏障的远场被动隔振效果进行了三维分析。详细讨论了影响隔振效果的几个主要参数，指出非连续排桩屏障隔振起到的是整体屏蔽作用。研究表明，影响多排桩屏障体系隔振效果的厚度主要取决于桩的排数，与桩的截面尺寸关系不大；密布小截面多排桩隔振效果与空沟和填充沟相当；桩的排距对隔振效果影响小；每一排桩的桩间净距是影响隔振效果的重要参量，为了获得满意的隔振效果，应控制相邻桩的桩间距足够小。最后，通过工程实例验证了多排桩的隔振效果。