Abstract
Dynamic compaction (DC) is commonly used to strengthen the coarse grained soil foundation, where particle breakage of coarse soils is unavoidable under high-energy impacts. In this paper, a novel method of modeling DC progress was developed, which can realize particle breakage by impact stress. A particle failure criterion of critical stress is first employed. The “population balance” between particles before and after crushing is guaranteed by the overlapping method. The performance of the DC model is successfully validated against literature data. A series of DC tests were then carried out. The effect of particle breakage on key parameters of DC including crater depth and impact stress was discussed. Besides, it is observed that the relationship between breakage amount and tamping times can be expressed by a logarithmic curve. The present method will contribute to a better understanding of DC and benefit further research on the macro-micro mechanism of DC.
Highlights
Dynamic compaction (DC) refers to the ground improvement method in which a heavy weight is dropped onto the ground surface from a great height to increase the density of the underlying soils. e DC method has been found to be useful in improving the mechanical behavior of underlying soil layers, especially loose granular materials [1,2,3,4]
The topic of DC has been widely researched in geomechanics, the performance design and the application of dynamic compaction are still largely empirical in nature. is may be due to the complexity of the soil itself and the substantial challenges associated with a DC field test
Particular attention is paid to develop a numerical model of the DC process that can stimulate the phenomena of particle breakage caused by DC. e influence of particle breakage on crater depth and impact stress by DC is presented. e relationship between particle breakage amount and impact time is discussed in detail
Summary
Dynamic compaction (DC) refers to the ground improvement method in which a heavy weight is dropped onto the ground surface from a great height to increase the density of the underlying soils. e DC method has been found to be useful in improving the mechanical behavior of underlying soil layers, especially loose granular materials [1,2,3,4]. Poran and Rodriguez [13] presented one of the earliest 2D models for simulating DC in dry sand using the finite element code. Considering numerical studies of DC, the discrete element method, which is neither limited by the large deformation nor the constitutive model of the soil, is superior [17, 18]. Ma et al [18] pointed out that the improvement and the maximum influence depth of DC can be evaluated via the porosity changes of the gravel soil obtained by the particle flow discrete (PFC) element method. Particular attention is paid to develop a numerical model of the DC process that can stimulate the phenomena of particle breakage caused by DC. Particular attention is paid to develop a numerical model of the DC process that can stimulate the phenomena of particle breakage caused by DC. e influence of particle breakage on crater depth and impact stress by DC is presented. e relationship between particle breakage amount and impact time is discussed in detail
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