Experimental Study on Ground Vibration Caused by the Blast Loading of an Explosion Vessel

2021 ◽  
pp. 2250003
Author(s):  
Jie Gong ◽  
Quan Wang ◽  
Baisheng Nie ◽  
Ze Ge
Keyword(s):  
Explosive Charge ◽  
Blast Loading ◽  
Ground Vibration ◽  
Propagation Distance ◽  
Vibration Velocity ◽  
Frequency Distributions ◽  
Hilbert Huang Transform ◽  
Propagation Law ◽  
Vibration Tests ◽  
Vibration Parameters

To investigate the ground vibration caused by the internal blast loading of an explosion vessel while evaluating the damage caused by vibration propagation to surrounding buildings, a series of explosion vibration tests were carried out using an explosion vessel. The blasting vibration monitors recorded the vibration parameters, and the vibration velocity frequency distributions were analyzed by the Hilbert–Huang transform (HHT) method. The results show that the explosion vibration velocity is closely related to the explosive charge and propagation distance. The effect of an explosive charge and propagation distance on the vibration amplitude at frequencies of 20–60[Formula: see text]Hz is not apparent, but at frequencies of 5–10[Formula: see text]Hz, low-order frequencies are noticeable. Furthermore, the energy amplitude and vibration action duration increase with increasing explosive charge and decrease with increasing propagation distance. The results provide an essential reference for studying the propagation law and effects on ground vibration waves produced by blast loading in an explosion vessel.

scholarly journals ENVIRONMENTAL IMPACT OF MINE BLASTING

1999 ◽  
Vol 1 ◽  
pp. 213
Author(s):  
Tonu Tomberg ◽  
Arvi Toomik
Keyword(s):  
Oil Shale ◽  
Ground Vibration ◽  
Mining Area ◽  
Underground Mines ◽  
Vibration Velocity ◽  
Charge Weight ◽  
Opencast Mines ◽  
Oil Shale Mining ◽  
Vibration Parameters ◽  
The Impact

The blasting is the predominating method o f breaking rocks in various surface and underground mines. At the same time some damaging impacts on environment are evident: noise, gas, dust, flyrock and ground vibration. The last factor is most important for safety o f constructions, buildings and various natural objects in the vicinity o f mining area. The ground vibration parameters, crucial for safety o f endangered objects have a significant correlation with charge weight and distance o f blasting. The properties o f vibration medium impact on the value o f these parameters. This study tried to associate the main vibration parameter, particle velocity with blasting parameters and properties o f vibration medium. The blast vibrations were studied in the soil o f Quaternary sediments and in Ordovician limestone in Estonian oil shale mining area in opencast and underground mines. The analysis o f measured data pointed significant correlation between vibration velocity and scaled distance from charges. The formulas and nomographs for prediction o f vibration velocity and fo r maximum permitted charge weights were elaborated fo r basic rocks and fo r soil, fo r oil shale underground and opencast mines. Using these formulas and nomographs in blast design will make possible to diminish the impact o f mine blasting on the objects located in the vicinity of mining area.

FEATURES OF SIMULATING THE FORCE ACTIONS FROM A DAMAGED ENGINE AT GROUND VIBRATION TESTS OF AN AIRPLANE

2016 ◽  
Vol 47 (6) ◽  
pp. 649-663
Author(s):  
Regina Vladimirovna Leonteva ◽  
Vsevolod Igorevich Smyslov
Keyword(s):  
Ground Vibration ◽  
Vibration Tests

Prediction of the Ground Vibration Rate during Large-scale Explosions in the Underground Conditions

2021 ◽  
pp. 41-45
Author(s):  
V.N. Tyupin ◽  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Underground Mining ◽  
Calculated Data ◽  
Ground Vibration ◽  
Open Pit ◽  
Vibration Velocity ◽  
Earth Surface ◽  
Seismic Safety ◽  
The Earth

At present, to ensure seismic safety in massive explosions, the analytical dependence of the determination of the vibration velocity of M.A. Sadovsky rock mass is mainly used. This dependence is widely used in the creation of seismic-safe technologies for mineral deposits open-pit and underground mining. However, scientific research and production experience showed that the rate of oscillation depends on the energy parameters of the explosive, the diameter and length of its charges, the number of simultaneously exploded charges, the number of deceleration stages, the deceleration interval, etc. The purpose of this article is to predict the speed fluctuations of the massif on the earth surface when conducting the underground explosions depending on the parameters of large-scale explosions and physical-technical properties of the rock masses in the areas of explosion of the protected object. The formulas for calculating the velocity of rock mass on the earth surface during large-scale explosions in the underground conditions are substantiated and presented. The formulas were used for calculating the vibration velocities of the rock mass on the earth surface in accordance with the parameters of drilling and blasting operations during large-scale explosions in the mines of GK VostGOK. Comparison of theoretical (calculated) data and the results of actual measurements indicates their convergence. By changing the controlled parameters in the calculation formulas, it is possible to quantitatively reduce the seismic effect of a large-scale explosions on the protected objects. Further research will be aimed at studying the influence of tectonic faults, artificial contour crevices, filling massif or mined-out space on the rate of seismic-explosive vibrations during blasting operations in the mines. The research results can be used in the preparation of rules for conducting large-scale explosions at the underground mining.

Research on the Vibration Attenuation Rules and Wave Propagation Law under Impacting Drill on the Deep Soil Layer

2011 ◽  
Vol 250-253 ◽  
pp. 1971-1977
Author(s):  
Bo Zhang ◽  
Lian Jin Tao ◽  
Wen Pei Wang ◽  
Ji Dong Li
Keyword(s):  
Wave Propagation ◽  
Soil Layer ◽  
Ground Surface ◽  
Ground Vibration ◽  
Vibration Source ◽  
Vertical Acceleration ◽  
Deep Soil ◽  
Deep Soil Layer ◽  
Propagation Law ◽  
Vibration Attenuation

A field test is carried out to study the effect of vibration while treating foundation using vibroflotation method in the deep soil layer in Zhengzhou, China. The vibration attenuation rules and wave propagation rules in different formations caused by different numbers of drills are analyzed. Evaluate the influence on the adjacent buildings. The result shows that the vibration will be generated in foundation obviously in the process of construction using the method. Vibration force, impact frequency and site soil are important influence factors on ground vibration attenuation. The analysis reveals that the maximum vertical acceleration attenuation velocity was much greater in near area than that in the relative far area. The waves caused by vibration propagate in two ways: (1) surface wave is generated on the wall of drill hole and propagated to the ground surface, and attenuated in a certain distance (<8m); (2) shear wave was generated and propagated in the impacting formation and attenuated from the deep formation to the ground surface. Vibration amplitude is mainly distributed in the low frequency range in the areas which far away from vibration source and in the silt layer near the ground surface.

Vibration Parameters Optimization Experiment on Seeder of Rice Bud-Seed for Field Seedling Raising Based on Virtual Prototyping Technology

2013 ◽  
Vol 341-342 ◽  
pp. 456-461
Author(s):  
Wang Yang ◽  
Jian Yang ◽  
Hui Ruan ◽  
Zhao Xin Liang ◽  
Jian Lin Mo
Keyword(s):  
Influencing Factors ◽  
Virtual Prototype ◽  
Optimal Combination ◽  
Parameters Optimization ◽  
Variation Coefficient ◽  
Dynamics Simulation ◽  
Vibration Velocity ◽  
Passing Rate ◽  
Velocity Interval ◽  
Vibration Parameters

The seeder of rice bud-seed for field seedling raising is a new seedling equipment for field seedling raising, which is a complicated vibration system with multi-freedom. And the effect of the vibration parameters and interactions on the vibration velocity at different locations of the moving rail of two electromagnetic vibration metering devices which are installed side by side is large, and the passing rate of seeding is affected. In this paper, the virtual prototype of seeder of rice bud-seed for field seedling raising is established by ANSYS and ADAMS. The virtual prototype is developed to carry out dynamics simulation by using four-factor quadratic regression orthogonal rotary combination design. Mathematical models of influencing factors of vibration and variation coefficient of vibration velocity, and the factors and average velocity of seeding are established. The factors are optimized. And optimal combination of vibration influencing factors and the variation coefficient of vibration velocity interval with 95% reliability are achieved. The result shows that optimal combination of factors is achieved under the condition that the excitation force amplitude is 39.8N, vibration frequency is 32.7Hz, the velocity is 58.5mm/s, stiffness of vibration isolating rubber pad is 1167N/mm. The corresponding variation coefficient of the vibration velocity is 6.287%, and the average seeding velocity is 18mm/s. The variation coefficient of the vibration velocity interval with 95% reliability is from 2.909% to 9.665%.

Dynamic Characteristics of a Wood Frame Structure: (II) the Effect of Artificial Damage

2013 ◽  
Vol 671-674 ◽  
pp. 921-926
Author(s):  
Hai Ling Xing ◽  
Dong Sheng Yao ◽  
Song Tao Xue
Keyword(s):  
Dynamic Properties ◽  
Damping Ratio ◽  
Frame Structure ◽  
Modal Parameter ◽  
Hilbert Huang Transform ◽  
Artificial Damage ◽  
Identification Technique ◽  
Wood Frame ◽  
Frequency Changes ◽  
Vibration Tests

A full-scale, three-storey wood frame structure had been tested in-situ to investigate the changes of dynamic properties due to artificial damage. Beams and braces of the test structure were removed, to simulate damage, and then reassembled, to simulate rehabilitation. Free vibration tests were performed during every stage of the tests. The natural frequencies and damping ratios were obtained using modal parameter identification technique based on the Hilbert-Huang Transform. It is shown that, when the structure is damaged or rehabilitated, the natural frequency changes in accord with the structural stiffness in general while the damping ratio varies irregularly.

scholarly journals Suppression of Ground Borne Vibration Induced by High-Speed Lines

2018 ◽  
Vol 152 ◽  
pp. 02001
Author(s):  
Ali Mohamed Rathiu ◽  
Mohammad Hosseini Fouladi ◽  
Satesh Narayana Namasivayam ◽  
Hasina Mamtaz
Keyword(s):  
Mathematical Model ◽  
Analytical Model ◽  
High Speed ◽  
Moving Load ◽  
Ground Vibration ◽  
Harmonic Excitation ◽  
Vibration Response ◽  
Vibration Velocity ◽  
Velocity Response ◽  
The Mathematical Model

Vibration of high-speed lines leads to annoyance of public and lowering real estate values near the railway lines. This hinders the development of railway infrastructures in urbanised areas. This paper investigates the vibration response of an isolated rail embankment system and modifies the component to better attenuate ground vibration. Mainly velocity response is used to compare the responses and the applied force is of 20 kN at excitation frequencies of 5.6 Hz and 8.3 Hz. Focus was made on ground-borne vibration and between the frequency range of 0 and 250 Hz. 3D Numerical model was made using SolidWork software and frequency response was produced using Harmonic Analysis module from ANSYS Workbench software. For analytical modelling MATLAB was used along with Simulink to verify the mathematical model. This paper also compares the vibration velocity decibels (VdB) of analytical two-degree of freedom model mathematical model with literature data. Harmonic excitation is used on the track to simulate the moving load of train. The results showed that modified analytical model gives the velocity response of 75 VdB at the maximum peak. Changes brought to the mass and spacing of the sleeper and to the thickness and the corresponding stiffness for the ballast does not result in significant vibration response. Limitations of two-degree analytical model is suspected to be the cause of this inactivity. But resonance vibration can be reduced with the aid of damping coefficient of rail pad. Statistical analysis methods t-test and ANOVA single factor test was used verify the values with 95% confidence.

In Situ Testing of the Vibration Isolation Effect of the Vibration Isolating Trench

2011 ◽  
Vol 90-93 ◽  
pp. 1679-1683 ◽  
Author(s):  
Kun Ming Mao ◽  
Guo Xing Chen ◽  
Yang Zhang ◽  
Xiao Xing Hong ◽  
Bin Ruan
Keyword(s):  
Vibration Isolation ◽  
Ground Surface ◽  
Ground Vibration ◽  
Isolation Effect ◽  
Good Effect ◽  
Vibration Velocity ◽  
Surface Vibration ◽  
Intercity Railway ◽  
Train Speed ◽  
Filtering Effect

One trench for agricultural irrigation next to the Hu-Ning Intercity Railway viaduct section were tested and analyzed in order to obtain the effect of ground vibration isolation when CRH trains run on. The result shows that with the decreasing train speed, the peak value of ground vibration velocity decreases and the main frequency of ground vibration heightens. Trench has lowpass filtering effect on ground surface vibration. The slower the train speed, the better the effect of isolation, but the phenomenon that ground surface vibration increases before trench is more obvious. When the length of trench is much longer than the length of train, the number of carriages has little effect on vibration isolation effect of the trench. When railways are built, consulting with nearby residents and department of agriculture, and the trench’s length, depth, breadth and the distance to railway should be designed reasonably. And then the trench in addition to meet need of irrigation, but also has very good effect on vibration isolation.

Research of Vibration Analysis and Monitoring during the Pile Driving

2013 ◽  
Vol 368-370 ◽  
pp. 1693-1696
Author(s):  
Ze Pei Xu ◽  
Xi Bing Li
Keyword(s):  
Impact Evaluation ◽  
Mechanical Vibration ◽  
Ground Vibration ◽  
Vibration Monitoring ◽  
Vibration Velocity ◽  
Pile Driving ◽  
Effect Evaluation ◽  
Monitoring Point ◽  
Surrounding Environment ◽  
Function Relationship

Ground vibration caused by pile driving is a kind of mechanical vibration, and the research of its characteristics is the premise of the effect evaluation on surrounding environment. With the engineering example by the analysis of vibration monitoring, the results show that the vibration frequency is low, and there is a power function relationship between the vibration velocity and the distance from monitoring point to the pile. It can be used for impact evaluation of vibration according to the fitting equation.

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