Influence of tamper weight shape on dynamic compaction

Abstract

This paper presents the effect of tamper weight shape on the dynamic compaction method in granular soils. Although the dynamic compaction method appears to be very simple, it requires careful design of the compaction process. The aim of this study is to improve the efficiency and decrease the cost of deep compaction by using cylinder-shaped tamper weights. The influence of the shape of the bottom of the tamper weight on dynamic compaction efficiency was evaluated experimentally on sandy soils. Sands of three different densities were used to evaluate the compaction efficiency. Conical-bottom tamper weights were studied with the conic angle approximately the same values as the internal friction angles of the three different densities of soil. Also, in order to compare results, a flat-bottom tamper was used with the same weight. The results indicated significant increases of the amount of ground improvement by using a conical rather than a flat-bottom load.Cet article traite de l'effet de la forme du poids de dameuse sur la méthode de compactage dynamique sur les sols granulaires. Bien que cette méthode apparaisse très simple, elle demande une conception soignée du processus de compactage. Cette étude a pour objectif d'améliorer l'efficacité et de réduire le coû t du compactage profond en utilisant des poids de dameuse de forme cylindrique. Elle évalue expérimentalement l'influence de la forme de la base du poids de dameuse sur l'efficacité du compactage dynamique pour des sols sablonneux. Des sables de trois densités différentes ont été utilisés pour déterminer l'efficacité du compactage. L'étude porte sur des poids de dameuse de forme conique avec un angle conique correspondant approximativement aux mêmes valeurs que les angles de frottement interne des trois différentes densités de sable. Une dameuse de base plate, de même poids, a également été utilisée en vue d'établir une comparaison. Les résultats indiquent une augmentation significative de l'amélioration du sol lorsque l'on utilise une charge à base conique plutô t que plate.

Improving The Engineering Properties of The Gypseous Soil Using Dynamic Compaction Method

“…The results of field penetration test are shown in table (2) and according to these results most of the soil is either loose or medium in its relative density and with depth the soil becomes dense.…”

“…The most popular formula which is used in this study to predict the depth of improvement is Menard formula [2].…”

“…From equation (1): The fall height of (8.0 m) was used in FDC under all towers foundations and a parametric study on soil below or near tower (F-4) was conducted using field penetration test (SPT) and the results are presented in table (2).…”

Numerical Modeling of Dynamic Compaction Considering Critical Distance from Adjacent Structures

“…Many researchers have used numerical methods to evaluate the mechanism of dynamic compaction (Pan and Selby 2002; Arslan et al 2007;Kopf et al 2010;Li et al 2010;Jia and Zhou 2010;Ghassemi et al 2010;Jahangiri et al 2010). Also experimental and physical modeling has been used to study this phenomenon (Jafarzadeh 2006).…”

Investigation on tamping spacing in dynamic compaction using model tests

“…They found that the efficiency of dynamic compaction with the conical-based pounder depended on both the grain size characteristics and the volume change behaviour of the sand. Arslan et al (2007) investigated the effect of tamper weight shape and the influence of the shape of the bottom of the tamper weight on the dynamic compaction method in granular soils experimentally. They studied conical-bottom tamper weights with the conic angles having approximately the same values as the internal friction angles of the three different densities of soil.…”