Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Li, Liang; Kou, X. Y.; Zhang, Gao; Huang, Ke-Wei

doi:10.3390/ma15134690

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…The paper [4] by Li, Kou, Zhang, and I Huang describes tests on aggregates, particularly sand. The authors presented results from dynamic compressive tests on sand under passive confining pressure, which were performed with a Split Hopkinson Pressure Bar (SHPB) setup.…”

Section: Reinforced Concrete Structuresmentioning

confidence: 99%

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Construction and Building Materials: Masonry Structures and Reinforced Concrete Structures

Drobiec,

Jasiński

2023

Materials

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Section: Reinforced Concrete Structuresmentioning

confidence: 99%

“…The numerical validation of the model of wall connections was proposed only in the paper [21]. Tests on component elements [2,4,5,7,9,11,14,21], and on repairs and strengthening of constructions [10,13,19,24] were conducted for both reinforced concrete and masonry structures.…”

Section: Reinforced Concrete Structuresmentioning

confidence: 99%

Construction and Building Materials: Masonry Structures and Reinforced Concrete Structures

Drobiec,

Jasiński

2023

Materials

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Analysis of the Influence of Silty Sands Moisture Content and Impact Velocity in SHPB Testing on Their Compactability and Change in Granulometric Composition

et al. 2023

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This paper presents the results of a test cycle of two types of silty sand (siSa) with different contents of fine fractions. Fine fractions are understood as soil grains with a grain diameter of less than 63 µm (as the sum of silt and clay fractions). The soils tested had a content of fine fractions of fSi+Cl,1 = 15.14% and fSi+Cl,2 = 20.48%, respectively, before the study. Changes in the content of these fractions after the experiments were analyzed. These experiments consisted of dynamic bar projectile impact loading, and a split Hopkinson pressure bar (SHPB) test stand was used in the study. Changes in the granulometric composition of the silty sands studied were carried out in a laser particle size analyzer, allowing measurement of fractional content in the grain size range from 0.01 µm to 3500 µm. As a result, a summary of changes in soil grain size curves in the range of fine fractions was compiled. Repeated trends were observed in the changes in the granulometric composition of the soil samples as a function of the moisture content of the soil sample (w1 = 0%, w2 = 5%, w3 = 10%, and w4 = 15%) and the impact velocity of the loading bar projectile for SHPB pneumatic launcher pressures (p1 = 1.2 bar → v1 = 12.76 m/s, p2 = 1.8 bar → v2 = 17.69 m/s and p3 = 2.4 bar → v3 = 21.32 m/s). The influence of the initial moisture content of the investigated soil on the value of the optimum moisture content obtained during its dynamic compaction was discussed. The trend in the behavior of the change in the granulometric composition of the tested samples was determined, taking the value of the initial moisture content of the soil in relation to the optimum moisture content of the reference sample as a reference. The largest percentage change in granulometric composition through an increase in the value of the silt and clay fraction relative to the reference sample fSi+Cl for both types of silty sand tested occurs for the same moisture content variant w2 = 5%–for soil fSi+Cl,1 = 15.14% there is an increase in the fine fraction of 11.08% and for soil fSi+Cl,2 = 20.48% there is an increase in the fine fraction of 15.17%. In general, it can be seen that more silty soil is more strongly susceptible to the phenomenon of grain crushing for moisture content w1 = 0% and w2 = 5% less than its optimum moisture content wopt,1 = 8.70%. In contrast, less silty soil is more susceptible to the phenomenon of grain crushing for moisture contents w3 = 10% and w4 = 15% greater than its optimum moisture content wopt,2 = 9.20%. The presented dynamic physical phenomenon of soil behavior is crucial during explosive and impact impacts on structures made of soil, e.g., as ground protection layers.

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Strain Energy Dissipation Characteristics and Neural Network Model during Uniaxial Cyclic Loading and Unloading of Dry and Saturated Sandstone

Yang

Cui

et al. 2023

Minerals

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The energy dissipation characteristics are important features of rock damage and failure during loading. However, the quantitative relationship between energy dissipation and rock failure is not clear. In this work, acoustic emission monitoring tests during uniaxial cyclic loading and unloading were conducted on sandstones in two conditions, namely dry and saturated, to investigate the energy evolution characteristics. Then, an index of the absolute energy ratio and a dynamic adjustment coefficient were put forward to represent rock damage and failure. A recurrent neural network was employed to predict the dynamic adjustment coefficient of dissipative strain energy. The results showed that (1) water saturation promoted the increased rate of dissipative strain energy during the last loading and unloading, but suppressed the sudden drop in elastic strain energy. (2) In the early and middle stages of cyclic loading–unloading, the absolute acoustic emission energy of dry and saturated rock samples was mainly generated by the historical maximum stress, while the absolute acoustic emission energy was mainly generated by cycle loading–unloading in the final cyclic stages. (3) The absolute energy ratio of both dry and saturated rock samples showed a sudden increase at the last cyclic loading–unloading, and this phenomenon can be taken as a precursor of rock damage of cycle loading–unloading. (4) The recurrent neural network for the prediction of the dynamic adjustment coefficient shows good agreement for rock failure related to dissipative strain energy. The results can provide experimental and prediction models for the monitoring and warning of rock engineering disasters in slopes, hydraulic fractures, tunnels, and coal mines.

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Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Cited by 3 publications

References 53 publications

Construction and Building Materials: Masonry Structures and Reinforced Concrete Structures

Construction and Building Materials: Masonry Structures and Reinforced Concrete Structures

Analysis of the Influence of Silty Sands Moisture Content and Impact Velocity in SHPB Testing on Their Compactability and Change in Granulometric Composition

Strain Energy Dissipation Characteristics and Neural Network Model during Uniaxial Cyclic Loading and Unloading of Dry and Saturated Sandstone

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