Change Rule of Blasting Vibration Peak Velocity in Brick-Concrete Building

2013 ◽  
Vol 718-720 ◽  
pp. 1878-1881
Author(s):  
Hai Liang Wang ◽  
Xian Bin Xue ◽  
Zhen Huang Zhang ◽  
Jun Tao Wang
Keyword(s):  
Peak Velocity ◽  
Vertical Direction ◽  
Vertical Vibration ◽  
Horizontal Direction ◽  
Blasting Vibration ◽  
Horizontal Vibration ◽  
Guide Line ◽  
Concrete Building

In this paper, the background is Qingdao Cross-harbor Tunnel Guide Line Project. The research on blasting vibration peak velocity was carried out by monitoring a 6-layer brick-concrete building. According the research, we discover that vibration peak velocity in the vertical direction reaches a maximum on the roof of the building. In the horizontal radial and tangential horizontal direction, the maximum appears at the 1st or 2nd floor. Third, within certain distance from blasting center, the value of horizontal vibration peak velocity is larger than vertical vibration peak velocity.

Characteristics of Multi-Storied Brick-and-Concrete Buildings Response to Blasting Vibration of Tunnel Excavation

2010 ◽  
Vol 163-167 ◽  
pp. 2608-2612 ◽  
Author(s):  
Hai Liang Wang ◽  
Tong Wei Gao
Keyword(s):  
Vertical Vibration ◽  
Vibration Velocity ◽  
Vibration Test ◽  
Blasting Vibration ◽  
Radial Vibration ◽  
Road Tunnel ◽  
Tunnel Excavation ◽  
Guide Line ◽  
Fire Station ◽  
Concrete Building

According to fire station of Tuandao road along to the Yunnan road tunnel of Qingdao Cross-harbor Tunnel Guide Line Project, the blasting vibration test was carried on. This building is three-storied brick-and-concrete building. Then monitoring data of particle vibration velocity was analysised and researched. The results showed that there is magnifying effect of vertical vibration velocity on the roof of the building, but its value is lesser than particle vibration velocity of the first layer. Horizontal tangential vibration velocity was existed on the central of the building. However there was no magnifying effect of horizontal radial vibration velocity. And its value is decreased rapidly from the first layer to the second layer, and then other floors basically keep steady.

Research of Colliding Ground Vibration in Blasting Demolition

2013 ◽  
Vol 765-767 ◽  
pp. 2284-2287
Author(s):  
Ze Pei Xu ◽  
Xi Bing Li
Keyword(s):  
Surface Wave ◽  
Shear Wave ◽  
Vibration Frequency ◽  
Ground Vibration ◽  
Compressional Wave ◽  
Vertical Vibration ◽  
Blasting Vibration ◽  
Frequency Bandwidth ◽  
Horizontal Vibration ◽  
Vibration Wave

Colliding ground vibration wave consists of compressional wave, shear wave and surface wave, and it spreads by the attenuation through the different rock or soil. Comparing from the frequency and duration to the blasting vibration, with the engineering example, the analysis on the characteristics of colliding ground vibration has made. It is the conclusion that its vibration frequency is close to the building, and the vertical vibration is greater than horizontal vibration, and frequency bandwidth decreases along the distance, while the duration increases.

Study on Vibration Effect in Deep Underground Reservoir Blasting

2014 ◽  
Vol 1065-1069 ◽  
pp. 393-396
Author(s):  
Bo Huang ◽  
Jian Guo Wang ◽  
Hong Bo Wang ◽  
Han Lu Fu ◽  
Rong Bin Zhou ◽  
...  
Keyword(s):  
Vertical Direction ◽  
Horizontal Direction ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Wave Impact ◽  
Vibration Effect ◽  
Blasting Excavation ◽  
Underground Reservoir ◽  
Deep Underground ◽  
Peak Value

Relying on the construction of a deep underground reservoir, vibration effects of ground were studied from two aspects: the peak value of vibration velocity and the basic frequency of blasting seismic waves, and were compared with the blasting vibration effect on the flat terrain surface. Research shows that blasting seismic wave’ impact on the surrounding building is relatively small because of its high frequency for the blasting excavation of underground reservoir. The frequency distribution in vertical and horizontal direction with scaled distance is roughly the same. And the peak value of vibration velocity in vertical direction is greater than that in horizontal direction, so blasting vibration effect in vertical direction is bigger than that in horizontal direction.

Blast Vibration Response of Tunnel Influenced by Confining Pressure and Surrounding Rock Type

2014 ◽  
Vol 533 ◽  
pp. 159-163
Author(s):  
Tie Jun Tao ◽  
Chun Ming Xie ◽  
En An Chi ◽  
Ming Sheng Zhao
Keyword(s):  
Rock Type ◽  
Vertical Direction ◽  
Confining Pressure ◽  
Vertical Vibration ◽  
Surrounding Rock ◽  
Vibration Velocity ◽  
Response Signal ◽  
Blast Vibration ◽  
Horizontal Vibration ◽  
Velocity Peak

Based on the finite element model of the tunnel, dynamic response of tunnel is studied influenced by different confining pressure and different surrounding rock types under of blasting vibration under blast vibration load. The results show that when the confining pressure increases, the maximum horizontal and vertical vibration velocity, stress and displacement increase, and the horizontal vibration amplitudes are less than the vertical vibration amplitudes. With the decreasing of the rock type, the vertical vibration velocity peak value increases, and vertical direction vibration velocity is more sensitive for the rock stress state. With the increase of depth of surrounding rock, the confining pressure increases, and the vertical velocity response signal of surrounding rock increases, and the response signal is more sensitive to the change of stress of surrounding rock compared with the horizontal vibration velocity peak.

Blast Vibration Response of Tunnel Influenced by Confining Pressure and Surrounding Rock Type

2014 ◽  
Vol 511-512 ◽  
pp. 652-657
Author(s):  
Tie Jun Tao ◽  
Chun Ming Xie ◽  
En An Chi ◽  
Ming Sheng Zhao
Keyword(s):  
Rock Type ◽  
Vertical Direction ◽  
Confining Pressure ◽  
Vertical Vibration ◽  
Surrounding Rock ◽  
Vibration Velocity ◽  
Response Signal ◽  
Blast Vibration ◽  
Horizontal Vibration ◽  
Velocity Peak

Based on the finite element model of the tunnel, dynamic response of tunnel is studied influenced by different confining pressure and different surrounding rock types under of blasting vibration under blast vibration load. The results show that when the confining pressure increases, the maximum horizontal and vertical vibration velocity, stress and displacement increase, and the horizontal vibration amplitudes are less than the vertical vibration amplitudes. With the decreasing of the rock type, the vertical vibration velocity peak value increases, and vertical direction vibration velocity is more sensitive for the rock stress state. With the increase of depth of surrounding rock, the confining pressure increases, and the vertical velocity response signal of surrounding rock increases, and the response signal is more sensitive to the change of stress of surrounding rock compared with the horizontal vibration velocity peak.

Analysis about Isolation Floor Consisting of FPS System and Dish Spring

2012 ◽  
Vol 602-604 ◽  
pp. 1541-1545
Author(s):  
Nan Ge ◽  
Hai Bin Chen ◽  
Li Ting Yao
Keyword(s):  
Coupling Effect ◽  
Lagrange Equation ◽  
Vertical Direction ◽  
Vertical Vibration ◽  
Low Friction ◽  
Isolation System ◽  
Horizontal Vibration ◽  
Partial Domain ◽  
Floor Isolation ◽  
Low Stiffness

A theoretical analyzing approach about the compound floor isolation system consisting of FPS and dish spring is derived. It starts from the Lagrange equation, with the coupling effect of the horizontal vibration and vertical vibration being included. Computation results show that for the proper specifications the floor isolation system may exhibit good effectiveness in mitigating the acceleration of the unfixed objects or equipments in both horizontal and vertical direction, while the extra displacement could be limited to be in a manageable range. The expected parameters for mitigating the accelerations agree with that for displacements in a partial domain. The specification of a floor isolation system needs low friction coefficient on the slide 0.05<μ<0.1, a reasonable slide radius 0.5<μ<1.0m, a relatively low stiffness coefficient and relatively high damp coefficient of the dish spring.

scholarly journals Modelling Ambient Vibration Responses Induced by Operation of Metro Train on Curved Rail Segment with Small Curvature Radius

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Bo Pan ◽  
Wei Zhang ◽  
Shuai Zheng ◽  
Ming-liang Zhou ◽  
Chun-fa Zhao ◽  
...  
Keyword(s):  
Vertical Vibration ◽  
Horizontal Direction ◽  
Ambient Vibration ◽  
Curvature Radius ◽  
Vibration Level ◽  
Horizontal Vibration ◽  
Vibration Responses ◽  
Amplifying Effect ◽  
Method Model ◽  
Planning And Operation

The torsional effect of the tracks on curved segment intensifies the ambient vibration response induced by Metro operation. This paper studies the ambient vibration responses induced by the operation of the Metro train on curved rail segments. By taking the curved segment of Hangzhou Metro Line 1 of China as an example, the wheel-rail model employing the multibody dynamics is demonstrated; the dynamic wheel-rail force of a B-type vehicle passing through a 350 m radius curved segment is also calculated. A finite element method model of the track-tunnel-soil-building is developed and verified by comparing the measured results with the simulated ones. Then, we analyzed the ambient vibration responses induced by the Metro operation. The results show that the horizontal vibration induced by the Metro train, on curved segments, cannot be ignored. When propagating on the ground, the variation trend of the horizontal vibration acceleration is greater than that of the vertical vibration. The horizontal vibration attenuates faster than the vertical vibration. The secondary vibration along the horizontal direction yields a significant amplifying effect upon the building. The vibration level increases with the height of the building, along the horizontal direction, but the vertical vibration level changes negligibly. The insight exhibits the influence level of the horizontal action of the Metro train wheels to the tracks, which can be referred by the practitioners for the planning and operation.

scholarly journals Analysis of the Main Factors Influencing the Dominant Frequency of Blast Vibration

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Da Liu ◽  
Wenbo Lu ◽  
Yijia Liu ◽  
Ming Chen ◽  
Peng Yan ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Peak Velocity ◽  
Spherical Wave ◽  
Dominant Frequency ◽  
Vertical Vibration ◽  
P Wave ◽  
Blasting Vibration ◽  
Radial Vibration ◽  
Factors Influencing ◽  
Main Factors

At present, the study on the dominant frequency of blasting vibration is still a worldwide problem. Compared with the mature research on the particle peak velocity of blasting vibration, the researches on the dominant frequency of blasting vibration are much less. In this paper, by analyzing the main influencing factors of the dominant frequency, an attenuation equation of the dominant frequency induced by blasting vibration has been proposed by dimensional analysis combined with the theory of radial spherical wave propagation. The proposed equation is applied to the fitting analysis on the dominant frequency measured in Zhoushan Green Petrochemical Base in China, which has obtained a favorable fitting correlation. Based on the fitting analysis, it has found that the correlation coefficient of radial vibration obtained by the proposed equation is higher than that of vertical vibration, which is resulted from the reason that the vibration in vertical is considered to be influenced most by the R-wave on the ground and perceived to be quite different from the radial vibration affected by P-wave. In generally, different components of blasting waves will affect the attenuation of dominant frequency.

Influences of Tunnel Excavation Blasting Vibration on Surface High-Rise Building

2010 ◽  
Vol 163-167 ◽  
pp. 2613-2617
Author(s):  
Hai Liang Wang ◽  
Tong Wei Gao
Keyword(s):  
Vibration Frequency ◽  
Vertical Vibration ◽  
Frame Structure ◽  
Vibration Monitoring ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Road Tunnel ◽  
Concrete Frame ◽  
High Rise ◽  
Order Of Magnitude

According to the 33 floors high building, blasting vibration monitoring had been carried on. The building, along Yunnan road tunnel of Qingdao Cross-harbor Tunnel Guide Line Project, has concrete frame structure. Monitoring data had been analyzed. Results showed that rules of vertical vibration velocity and main vibration frequency have similar relevance. Amplification effect of them was existed on the middle and top of the building. From the 2nd floor of downward ground to ground, the value of them suddenly decreased. Main vibration frequency is in the range of 101~102 order of magnitude.

Numerical Simulation of a Jumper Conveying Slurry for Deep-Sea Mining

2021 ◽  
Author(s):  
Marcio Yamamoto ◽  
Tomo Fujiwara ◽  
Joji Yamamoto ◽  
Sotaro Masanobu
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Dynamic Analysis ◽  
Internal Pressure ◽  
Deep Sea ◽  
Petroleum Industry ◽  
Vertical Direction ◽  
Internal Flow ◽  
Horizontal Direction ◽  
Viscous Pressure

Abstract One key technology for Deep-Sea Mining is the riser system. The riser is already a field-proven technology in the Petroleum Industry. However, several differences exist between a petroleum production riser and a riser for Deep-Sea Mining, mainly related to the internal flow. The ore-slurry has a larger density than the hydrocarbons and shall be pumped with a much higher flowrate. The current software tools for riser’s dynamic analysis may include the internal fluid hydrostatic pressure and the centrifugal and Coriolis forces imposed by the bent pipe’s internal flow. However, the internal pressure drop is not calculated. The internal pressure alters the pipe’s effective tension and can alter the pipe’s bending moment changing its mechanical behavior. This article describes a computational script’s development to run embedded in a commercial software for riser’s dynamic analysis. Our script calculates the internal viscous pressure drop along with the jumper. This pressure is then converted into wall axial tension (buckling) and imposed on each node of the jumper’s numerical model. Each simulation case was calculated twice with and without the internal flow viscous pressure drop. The comparison with experimental data revealed that the jumper’s average position has a good agreement among all cases. However, the amplitude caused by the top oscillation showed some discrepancies. Experimental data has the highest amplitude in the horizontal direction, while the simulation without viscous pressure calculation had the smallest. The simulation with our embedded script had intermediary amplitude in the horizontal direction. The vertical direction amplitudes have the same behavior for all cases, but the experimental data showed the highest amplitude.

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