Man-Made Vibrations and Solutions

The generation and propagation of man-made vibrations in the ground is discussed. Emphasis is placed a simplified approach which is used to assess the most important factors, such as wave attenuation, refraction focusing and vibration amplification as a result of resonance. Practical guidelines are presented which can be used to predict vibrations and settlements in the ground. A semi-empirical relationship for the assessment of permissible vibration levels for buildings is proposed. Finally, a new ground vibration isolation method, the gas cushion screen is presented

Stability of Shannon Embankments

During the operating life of the Shannon Embankments, stability and seepage problems have occurred which caused concern regarding long term safety. The geology was studied, a comprehensive scheme of field and laboratory investigation was undertaken and the stability was analyzed and back calculated under failure conditions. The relative significance of various parameters was studied and provided the basis for the design of remedial measures. This paper deals in detail with the study of the stability of one embankment section (Fort Henry) and the recommendations on remedial measures