Investigating on the performance of retrofitted trench with Leca in reducing ground vibrations

Document Type : Research Article


1 Department of Civil Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran

2 Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran

3 Department of Civil Engineering, Rudehen Branch, Islamic Azad University, Rudehen, Iran

4 Assistant Professor, Department of Civil Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran


Environmental vibrations can have a significant impact on noise pollution and the health of the residents of buildings adjacent the vibration sources. Therefore, the studies conducted in the last two decades on reducing vibrations have attracted a lot of attention from researchers. In this study, the effect of different types of improved trenches with Leca lightweight aggregate, including single and double-walled trenches in both active and passive modes, has been investigated, using the combination of Plexis3D finite element software and Python programming language, and the models with the results of other researches. It has been validated and also, a parametric study has been done to evaluate the effect of geometrical factors including depth, width and length for both systems. The obtained results indicate that in order to achieve an acceptable amount of trench efficiency, the depth of 0.8λr and 1λr is sufficient as the optimal depth for single and wall systems, respectively, and considering the effect of the width of the trench filled with Leca, a width equal to 0.2λr and 0.15λr are enough to reach the optimal width for single-wall and double-wall systems, respectively. Also, for passive design, the role of depth can be ignored for single and double-walled barriers, because trench width plays a more important role compared to trench depth. Moreover, to achieve an acceptable single-wall system, the normal width should be increased to about 0.2λr.


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