Control negative effects of blasting waves on concrete of the structures by analyzing of parameters of ground vibration

Nateghi, R.; Kiany, M.; Gholipouri, O.

doi:10.1016/j.tust.2009.04.004

Cited by 54 publications

(23 citation statements)

References 4 publications

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“…Fig. 1 Particle size distribution by simple and double hydrometric methods [6,11] Fig. 2 Soil classification [7,10] The step to produce and treat samples was to apply the density test through application of the proctor compaction test on natural soil (Table 4).…”

Section: Materials Used and The Testing Programmentioning

confidence: 99%

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Dispersive Clay Stabilised by Alum and Lime

Hassanlourad¹

2017

geomate

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Dispersion phenomenon can cause erosion problems during hydraulic construction projects such as earth dams, channels, hydraulic installations and embankments. However, aluminum sulfate can be used to stabilize dispersive clay. Tests were done to consider the effects of alum and lime additions on shear strength parameters of clay as secondary effects. Clay for samples was taken from the Mirzakhanluo Dam, located in Tarom County, northwestern Zanjan Province of Iran. In this research, the clay sample was subjected to direct shear testing; the clay was tested with optimum moisture under varying percentages of alum (0, 0.3, 0.6, 1, 3, and 5 as percentage of dry soil weight) for 28 days. Also, unconfined tests were conducted on samples with equal amounts of moisture, alum and lime under the different treatment durations of 7, 14, and 21 and 28 days, separately. Results for the direct shear test indicated that the maximum cohesion was recorded in the sample with 1% alum. Results also showed that the internal friction angle decreased in samples with alum percentage up to the level of 0.6% and at levels higher than that it showed an increase. Generally, results showed that soil shear strength was higher in soil stabilized by alum than in unstabilized soil. Results of the uniaxial test, determined that alum and lime additions to dispersive soil and its treatment, compression strength was not limited and elastic modulus showed an increase. The highest evaluations were determined for amounts of elastic modulus and uniaxial strength in soil with 3% lime or 5% alum on the 28 th day of treatment.

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Section: Materials Used and The Testing Programmentioning

confidence: 99%

“…In Iran, the effect of aluminum sulfate was evaluated in terms of dispersive rate in the Gotvand Dam project [6]. According to these above-mentioned investigations, addition of 0.6 % aluminum sulfate changes soil to a non-dispersive state [7].…”

Section: Introductionmentioning

confidence: 99%

Dispersive Clay Stabilised by Alum and Lime

Hassanlourad¹

2017

geomate

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“…Nevertheless, it has not been applied in all areas. However, the effects of blast-induced PPV in each country are different [60] and need to be accurately predicted. Also, comparison, evaluation, and selection of SVR models with varying functions of kernel have not been performed in previous studies.…”

Section: Introductionmentioning

confidence: 99%

Support vector regression approach with different kernel functions for predicting blast-induced ground vibration: a case study in an open-pit coal mine of Vietnam

Nguyen

2019

SN Appl. Sci.

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Blast-induced ground vibration (PPV) is one of the effects of the hazard in open-pit mines. It can make vibration of the structure, instability of slope and bench, impact on underground water, and the surrounding residential. Therefore, the precise prediction of blast-induced PPV is needed to minimize undesirable effects on the surrounding environment. Also, one of the most important objectives of this study is to determine the site characteristics for the application of controlled blasting techniques. In this study, the support vector regression (SVR) approach was considered and developed for predicting blast-induced PPV in an open-pit coal mine (Vietnam) as a case study. Three forms of the equation include linear (L), polynomial (P), and radius basis function (RBF) were applied to develop the SVR models. For comparison purpose, an empirical technique was also referred to as estimate blast-induced PPV in this study on the same training dataset. A database with 181 blasting events was used for this aim. Performance indicators such as root-mean-square error (RMSE) and the coefficient of determination (R 2 ) were used to compare and evaluate the performance of the predictive models. The results showed that SVR was an effective approach for predicting blast-induced PPV in this study. Among three forms of the equation, the SVR model with RBF was the most superior model for predicting blast-induced PPV in this study with an RMSE of 0.396, R 2 of 0.924, and MAE of 0.135, whereas the empirical model only obtained performance with an RMSE of 0.856, R 2 of 0.643, and MAE of 0.575. This study provided an overview of the SVR approach in predicting blast-induced PPV. A comparison of different kernel functions for the selection of the SVR model is needed to find out the best model for predicting blast-induced PPV.

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“…Reinforced concrete structures will bear various types of loads, among which constantly repeated loads during normal usage. These loads can include vehicle loads on bridges, elevated roads and underground railway tunnels, vibration loads on industrial structures, wind loads on ocean engineering constructions, and wave loads on harbor constructions . The effect of repeated loads on the operational properties of concrete structures is more intense and complex than that of static loads.…”

Section: Introductionmentioning

confidence: 99%

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

Sun

et al. 2017

Structural Concrete

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Some reinforced concrete structures are subjected to repeated loads during their service lives, and the effect of repeated loads is stronger and more complex than static loads. This paper reports the results of the tests performed on cylindrical reinforced concrete specimens under uniaxial repeated loads. The effect of structural parameters (e.g., stirrup configuration, bond length, confinement method, and concrete cover) and loading parameters (e.g., amplitude, peak load, loading rate, and initial load cycles) on the bond properties of the reinforced concrete under repeated loads was studied in detail. In addition, the degradation mechanisms and failure modes of the specimens' bond stress were analyzed. It is found that the use of stirrups, increase of bond length, and concrete cover, as well as confinement can effectively curb the widening and expansion of cracks in concrete and significantly improve ductility and repeated load bearing capability. As the rigidity of confinement material increased, the enhancement effect of confinement on bond stress increases. Compared to the role of confinement (e.g., carbon fiber reinforced polymer), increasing the concrete cover can more effectively improve the bond stress. The rebar's subsequent residual bond stress declines as the number of early-stage load cycle increases.bond stress, load parameter, reinforced concrete, repeated load, structural feature | INTRODUCTIONReinforced concrete structures will bear various types of loads, among which constantly repeated loads during normal usage. These loads can include vehicle loads on bridges, elevated roads and underground railway tunnels, vibration loads on industrial structures, wind loads on ocean engineering constructions, and wave loads on harbor constructions. [1][2][3][4][5][6] The effect of repeated loads on the operational properties of concrete structures is more intense and complex than that of static loads. With an increasing number of load cycles, damage accumulates in the bond of the reinforced concrete, and slip occurs between the rebar and the concrete, leading to increased structural deflection, reduced strength, and even sudden failure. An effective, scientific evaluation of the accumulated level of a structure's damage in a repeated load environment and an understanding of the degradation mechanism of the bond stress between the rebar and concrete under repeated loading would enable prompt and effective strengthening and repair measures to slow the structural damage process.Because of the heterogenic nature of concrete materials and the complexity of repeated loads, performance tests are the most commonly employed means of investigating this problem. Rehm and Elingehausen 7 showed that rebar diameter and concrete strength had no effect on bond fatigue life; with an increasing number of load cycles, rebar slip was related to not only load cycles but also stress levels and loading rates, and the effect of load cycles on the ultimate bond stress was relatively small. Balazs 8 reported that the slip rate tended...

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Control negative effects of blasting waves on concrete of the structures by analyzing of parameters of ground vibration

Cited by 54 publications

References 4 publications

Dispersive Clay Stabilised by Alum and Lime

Dispersive Clay Stabilised by Alum and Lime

Support vector regression approach with different kernel functions for predicting blast-induced ground vibration: a case study in an open-pit coal mine of Vietnam

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

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