ground vibration due to blast status of in china

Safety Distance of Shotcrete Subjected to Blasting

The drill and blast method is widely used in constructing tunnels in rock Unfortunately blasting vibration can damage newly performed shotcrete layers which are major support structures to stabilize surrounding structur Therefore investigation of the influence of blasting on shotcrete and determining reasonable distance between blasting work face and shotcrete position is of great...

Construction Blasting Risk Management Expert Commentary

Blast effect monitoring data such as ground vibration levels air-over-pressure measurements Notes about blasting results Name and signature of blaster-in-charge Risk Management Risk management in blasting work is increasingly becoming more challenging...

Studying Peak Particle Velocity Due to Blast in

Keywords Explosion Ground vibration Peak particle velocity Predictive equation Statistical analysis 1 Introduction Blasting is usually the method of choice in the advancing faces of the coalmin Ground vibration air vibration air blast rock emission and the shockwave created by the explosion are inevitable and they cannot...

PDF Vibration Discomfort Levels Caused by Blasting

Thus the response of women and men to vibration will be different Considering this situation we investigated how gender affects the level of being uncomfortable with blast-induced ground vibration...

Rock fragmentation control in opencast blasting

Apr 01 2016 0183 32 The near field blast vibration signals were also recorded to diagnose the impact of delay timing on rock fragmentation The blast wave signals recorded at 100 m from one of the hard overburden dragline bench blast are depicted in Fig 7 In this blast the delay interval between the holes in a row was 17 ms and between the rows the delay...

An introduction to Chinese safety regulations for blasting

Mar 20 2012 0183 32 By reviewing the development history and the state-of-art this paper introduces Chinese safety regulations for blasting vibration for adjacent structures and equipments as well as for structures themselves under blasting operation such as high rock slopes underground caverns foundation rock masses and fresh concrete The mechanism of failures or damages induced by blasting vibration...

Putting ground vibration predictions into practice

misc etde_6514880 title = Putting ground vibration predictions into practice author = Roy P P abstractNote = The blast vibration prediction model developed at the Central Mining Research Station CMRS India simultaneously takes account of the decay of amplitude due to geometrical spreading and inelastic attenuation The equations consider a zone of disturbance in terms of scaled...

Blasting Vibration Monitoring of Undercrossing Railway

Jun 08 2015 0183 32 In order to monitor the effect of the blast-induced vibration on the structure of existing tunnel a wireless sensor network WSN was established which included the blast vibration monitoring system and the wireless remote data acquisition system An existing railway tunnel was monitored during the construction of a new tunnel in Shaanxi China...

Reduction of Blast Induced Ground Vibrations with Open

The extent of reduction in the vibration levels due to trench in different blasts is shown in Figure 4 The minimum and the maximum reduction in vibration levels due to the trench were 11 and 19 per cent respectively The field results are not indicative of any relationship between the horizon of the blast and the efficacy of the trench in...

Assessment of Blasting

The seismic wave energy associated with the blast induced ground vibration decreases with distances due to decay of both the amplitude and the frequency of vibration Base in China which has...

Building damage due to vibration from rock blasting

Nov 01 2020 0183 32 Measured vibration velocity from the third blast round on ground Mp3 a Time seri The instantaneous frequency was computed to 20 Hz around the highest peak ie between the two red dotted lin b PPV vs zero-crossing frequency determined by the measurement instrument c Response spectra d Power Spectral Density...

Safety assessment of upper water pipeline under the

Oct 01 2019 0183 32 The natural vibration frequencies of buried pipelines of different sizes mentioned in many literatures are close to 100 HZ However the dominant frequency of blasting vibration is mostly concentrated in 10 30 HZ and some are as high as 50 HZ which is still far below the natural vibration frequency of the buried pipeline Therefore the...

A Comparative Study of Ground and Underground Vibrations

Apr 01 2016 0183 32 Ground vibration is mainly affected by various blast design parameters distance between the blast and observation points geological characteristic properties of the rock mass and explosive characteristics Elevli and Arpaz 2010 Liang et al 2011 Blast-induced ground vibrations are characterized by two important parameters ie the peak...

Research Article Experimental Study on the Measurement

Research Article Experimental Study on the Measurement of Water Bottom Vibration Induced by Underwater Drilling Blasting GuWenbin 1 ChenJianghai 1 2 WangZhenxiong 1 WangZhihua 3 LiuJianqing 1 andLuMing 4 College of Field Engineering PLA University of Science and Technology Nanjing China...

Rock Fragmentation by Blasting Taylor Francis Group

Nov 05 2012 0183 32 Development of engineering blasting techniques in China By XG Wang View abstract The development of a trivariate statistical blast vibration model that seeks to respect both the difference between types of seismic waves and their attenuation rates Evaluation of the effect of ground vibration due to blasting on adjacent structures...

Rock Fragmentation by Blasting Fragblast 10

Nov 25 2012 0183 32 Comparison of two near-field blast vibration estimation models A theoretical study S Arora P Murmu K Dey An equivalent simulation method for whole time-history blasting vibration JH Yang WB Lu M Chen P Yan P Li Evaluation of the effect of ground vibration due to blasting on adjacent structures in dam construction projects...

US relations with Russia China deteriorated because of

Both China and Russia have already expressed their willingness to work with the new administration and their readiness to look for common ground in order to reverse the negative trend in relations...

US9927340B2

In underground mines blast vibration can cause instability in large open stopes caving operations and mine development tunnels It can therefore be desirable to measure vibrations in an attempt to determine whether an amount of vibration due to one or more events eg blasting events may lead to instability...

Vibration Measure Acceleration Velocity or Displacement

Sep 05 2011 0183 32 i am doing research on monitoring of ground vibration due to blasting in min and i am getting few doubtsplease clarify me 1which accelerometer is suitable to measure ground vibration 2the blast induced ground vibration frequency range in between 10-20 Hz only 3how can i convert accelerometer data into velocity...

high effective mining vibration table

Airblast and Ground Vibration Generation and - CiteSeerX Appendix C--Blast design noise and vibration from contour min 27 Airblast from shots contour and flat-area coal mines 01-Hz high pass Airblast from was also observed leading to more efficient propagation along the hol- TABLE 2...

Blasting vibration characteristics and PPV calculation

However it can also cause some adverse effects such as induced vibration air blast fly rock back break and uncomfortable noise 3 4 5 Among these unwanted effects induced vibration is...

Forecasting blast

Aug 30 2016 0183 32 Drilling and blasting is an extensively used method for the rock fragmentation in surface mines and tunneling projects Ground vibration is one of the most important environmental effects produced by blasting operations In this research work classification and regression tree CART multiple regression MR and different empirical models are used to develop predictions for ground...

Roadheader solutions in focus

The roadheader or header machine has become a familiar piece of excavating equipment in civil tunnelling The technology is actually younger than may be realised with the first roadheader patent being applied for by Dr Z Ajtay in Hungary in 1949 and developed as a remotely operated priapic miner for exploitation of small seams in coal mining...

Blast Induced Crack Propagation and Damage Accumulation in

Blast induced rock mass damage and crack propagation play important roles in structure safety and stability in mining quarrying and civil constructions This paper focuses on the effect of small blasthole diameter blast on crack propagation and damage accumulation in water-bearing rock mass containing initial damage composed of inherent geological discontinuities and previous multiblast...

Survey on the influencing factors of human comfort in a

Blasting operation exerts adverse effects on the vibration comfort of nearby buildings and structures and causes a number of civil complaints discomfort and even lawsuits Blasting vibration comfort is related not only to the vibration characteristics of blasting and buildings but also to the non-blasting factors such as i the gender age income psychology and educational background...

Safety assessment of upper buried gas pipeline under

As the buried gas pipelines are not easily field monitored its status under the influence of tunnel blasting vibration is often difficult to obtain In order to assess the safety of an upper buried gas pipeline under blasting vibration in the Beijing subway line 16 we established the 3D numerical model of the real field engineering to calculate and analyze the distribution of peak particle...

Feasibility of ANFIS model for prediction of ground

Mar 25 2015 0183 32 One of the most significant environmental issues of blasting operations is ground vibration which can cause damage to the surrounding residents and structur Hence it is a major concern to predict and subsequently control the ground vibration due to blasting This paper presents two artificial intelligence techniques namely adaptive neuro-fuzzy inference system ANFIS and...

MEASUREMENT AND EVALUATION OF BLASTING GROUND

In the seventies a comprehensive study of ground vibration produced by blasting on tens of homes and hundreds of production blasts to reanalyze the blast damage criterion has been carried out The United States Bureau of Mines USBM in RI 8507 concluded that particle velocity is still the best single ground vibration...

Vibration Discomfort Levels Caused by Blasting According

Jun 10 2020 0183 32 Due to the lack of studies on the physiological effects of blasting they investigated the impact of blast-induced vibration on the human brain They made an experimental study with six participants one of them was for the four different ground vibration...

KR100665878B1

The present invention relates to a method for designing a blast pattern by determining the optimum delay time of the electron primer for maximizing the blast efficiency while minimizing the blast vibration when applying the electron primer to the rock blasting The present invention provides a method for designing a low vibration low noise blasting pattern by determining the optimum delay time...

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