• Title/Summary/Keyword: blasting noise

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A Study on Practicalization of Low Vibration New KINRECKER-II (미진동 발파용 New KINECKER-II 실용화에 관한 연구)

  • Jang, Seung-Ho;Park, Hee-Won;Lim, Jung-Hyuk;Lee, Chang-Yeop;Ahn, Bong-Do;Kang, Dae-Woo;Lee, Ha-Young
    • Explosives and Blasting
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    • v.35 no.1
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    • pp.43-52
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    • 2017
  • Mountain and hill areas occupy by more than 70% in South Korea and Rock drilling should be applied in order to reduce noisy & vibration from massive civil engineering business such as road expansion, high-way construction, subway construction and construction of site renovation such as a newly-built & re-development of apartment, newly-built of high-rising building in downtown area. As Blasting noise & vibration such as vibration, noise, fly rock etc caused by blasting operation from large small scale construction occurs, neighboring residents who demand the compensation file a civil complaint so that the business reach a deadlock. As the excavation method for these areas, There are blasting of micro-vibration, mechanical excavation method(Rock splitter, Breaker etc), similar blasting method(plasma, gel fragmentation etc) to date. In this study, we are trying to find the feature & performance which get improved economic feasibility & construct ability through improving sympathetic detonation of New KINECKER-I used in blasting of micro-vibration & formulation and would provide convenience for use by introducing standard blasting pattern & construction method. Also, checked and confirmed all the blasting with connecting cap has been cleary detonated.

A Case Study of Tunnel Electronic Blasting to Control Vibration in the Proximity of the Safety Facilities (근접 보안물건의 진동제어를 위한 터널 전자발파 시공사례)

  • Seo, Yun-Sik;Woo, Sang-Don;Kwon, Yeong-Bok;Kim, Jong-Su;Choi, Hyeong-Bin;Kim, Seon-Hong;Kim, Gab-Soo;Kim, Jae-Hoon;Kim, Hee-Do;Lee, Jun-Won
    • Explosives and Blasting
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    • v.30 no.1
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    • pp.37-51
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    • 2012
  • In this case of "Seongnam~Yeoju double-lanes railroad construction", there were safety facilities which were concerned about damages from vibration and noise. In the project design stage, the rock-splitter method was designed to prevent them. The electronic blasting was considered to improve construction speed and economic value as an alternative tunnelling method, complying with the site's vibration criteria(cowhouse : 0.09cm/sec, residence : 0.2cm/sec). In the environment evaluation report of the eDev, tunnel electronic blasting systems, the blasting pollutions can be managed by the electronic blasting method. The results were successfully conducted with high speed construction without any damages to adjacent facilities.

A Study on the Safety Test Regulation for the Metallic Sound Barrier of the Absorption Type (금속재 흡음형 방음벽의 안전 시험 규정 분석 연구)

  • Huh, Young
    • Explosives and Blasting
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    • v.20 no.4
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    • pp.5-15
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    • 2002
  • For the noise reduction measures in a construction field where noise sources such as blasting and pile driving works exist, the construction of the sound barrier near the noise source or receiver is often the most economic measure in order to exclude the propagated sound. The dimension of the barrier is decided by the noise and construction design, and the constructive quality of a soundproof panel shall be secured in accordance with KS F4770 to guarantee the safety of sound barriers. In this paper the problems included in the KS F4770-1 that is the regulation for the metallic sound barrier of the absorption type are identified and it is suggested what to be corrected or improved. Through a series of the analyses, conclusion were reached that it is required to improve test methods in KS F4770-1 as well as to break down loads for building more cost-effective sound barrier. In addition, KS F4770-1 was compared with ZTV-Lsw 88 which is the german regulation for sound barrier design. As a result, it was found that the Korean regulation is more conservative than that of Germany.

On the Blasting Technology Develppment of Korea (한국의 폭파 기술 발전)

  • Huh, Ginn
    • Explosives and Blasting
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    • v.13 no.4
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    • pp.5-27
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    • 1995
  • Korea-America tungsten treaty is not only Earnning Us Dollar but also it was turnning point of tunnelling technology development such as a burn cut. Because 10th of specialist worked at Sangdong mine under treaty. The first of all, Experimental blasting pattern for single free face carried out. As a result it has brought the burden and $charge/m^3$ and also space distance. After the center holes are blasted. Remain of the works was the implementation of bench cut against the openning to make the full sectional are required. $Ca=\frac{A}{SW}$ where as A =ndi=m activated area S = Peripheral length of Charged room Ca = Rock Coefficient di=Holes diameter Later in 1980, The Oynaite Explosive is Replaced into Emulsion & Milli-Second Delay Electric Cap. Seqential Blasting machine were Applied in the Site. The Subway Tunnelling have been worked so Carefully for Vibration and Noise to near Shopping and housing area. We carried out Empirical formula to solve city Envoirement pollution as follow For Granite: $V=KW^{0.57}D^{-1.75}$ For Granite : $V=KW^{0.5}D^{-1.5}$ V=PPV(cm/sec) K=Coefficency D=Distance(m) W=Amount of power/delay(kg)

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Measures to Reduce Mine Hazards Caused by Open- cut Mining of Limestone Mines (석회석광산에서 노천채굴에 따른 광해 발생을 감소시키기 위한 대책)

  • Won, Yeon-Ho;Ah, Jin-Man
    • Explosives and Blasting
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    • v.24 no.2
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    • pp.75-82
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    • 2006
  • Most of limestone mines in Korea have been developed by a open-cut mining method in consideration of a deposited condition of ore, ore recovery, safety, economic efficiency, etc.. But it has produced environmental problems such as dust flying, blasting noise & vibration, and spoil of farmlands due to slope failure of waste rock mass caused by access road construction, fragmentation & crush of rocks, blasting, transportation, and mineral processing. In this study, it has been suggested for measures to reduce mine hazards caused by open- cut mining of limestone nines.

A Study on the Estimation of Coefficients K and n Using Multivariate Data Analysis (다변량 통계기법을 이용한 K및 n의 산정에 관한 연구)

  • 백용진;최재성;배동명;김경진
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.8
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    • pp.583-590
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    • 2003
  • For the preestimate of the vibration level of the ground next to a dwelling, a multivariate statistical analysis on the experiment data acquired from a variety of construction sites was performed, and then a new estimate model for the value of K and n that can be applied in the diagnosis of the damage was offered. The results maybe summarized as follows : First, the $K_{95}$ and n showed high correlation at P$\leq$0.05. Specially the correlation coefficient about $W_{max}$, S were higher in $K_{95}$ than in n. indicating that $K_{95}$ is generally associated with source conditions. Second, the factor analysis permitted to identify two major sources in each fraction. These sources accounted for at least 73 % of valiance of $K_{95}$. Third, the multiple regression model for the estimate of $K_{95}$ was developed from Fac1 which depend upon the source conditions and Fac2 which depend upon the transmission conditions. The n value is able to determine from the correlation relationship associated with $K_{95}$./.

A study on pilot Test of the Composition Presplitting Angle Cut method in tunnel blasting (터널 심발부의 선균열을 이용한 발파공법의 현장시험에 관한 연구)

  • Hwang, Hak;Lee, Tai Ro
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.4 no.4
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    • pp.287-300
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    • 2002
  • Composition Presplitting Angle Cut (COPA-Cut) is a newly developed blasting method for tunnel excavation. Contrary to existing methods, COPA-Cut first creates presplitting by tension crack in cut. In this study, field tests measuring the advance efficiency, noise and ground vibration were performed in order to verify the presplitting effect. To compare the economy and workability, tests were simultaneously performed by COPA-Cut and existing method on the same condition. Results show that COPA-Cut increased advance efficiency and decreased noise and ground vibration. Also, it was confirmed that COPA-Cut is superior to existing method in terms of economy, workability and quality control.

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Application of Pulsed Power with the High Voltage & current for Rock Fragmentation (고전압.대전류폴스파워를 이용한 암반발파 모의 기술개발)

  • Seo, Kil-Soo;Kim, Young-Bae;Lee, Hyeong-Ho
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1592-1595
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    • 1998
  • The rock fragmentation system with a capacitor bank, switching device, cable and blasting electrode are described. Utilization of the chemical energy from the electrolyte and the pseudospark with a large current capacity suggested the commercialization possibility of the rock fragmentation system. The vibration and noise level of the pulsed blasting is acceptable in the most ground breaking. And also the electromagnetic force produced by the inductor is introduced for the rock fragmentation.

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A study on the transformation of blasting noise and vibration level (발파 소음.진동 수준의 변환 연구)

  • 김남수;양형식
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.377-380
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    • 1998
  • Basting vibration and air blast were measured by particle velocity and overpressure as well as environmental unit, dB(V) and dB(A). Variables for vibration and noise show good relationship and proportional equations are suggested. But there are some variations, and it means that predictions by design variables are not valid for human damage estimation or limit application of regulations.

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A Case Study on the Blasting Analysis of Slope Using Monitored Vibration Waveform (실측진동파형을 이용한 비탈면 발파진동 해석 사례)

  • Park, Do-Hyun;Cho, Young-Gon;Jeon, Seok-Won
    • Explosives and Blasting
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    • v.24 no.2
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    • pp.41-50
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    • 2006
  • Excavation by explosives blasting necessarily involves noise and vibration, which is highly prone to face claims on the environmental and structural aspects from the neighbors. When the blasting carried out in the vicinity of a structure, the effect of blasting vibration on the stability of the structure should be carefully evaluated. In the conventional method of evaluation, an equation for blast vibration is obtained from test blasting which is later used to determine the amount of charge. This method, however, has limitations in use since it does not consider topography and change in ground conditions. In order to overcome the limitations, dynamic numerical analysis is recently used in continuum or discontinuous models, where the topography and the ground conditions can be exactly implemented. In the numerical analysis for tunnels and rock slopes, it is very uncommon to simulate multi-hole blasting. A single-hole blasting pressure is estimated and the equivalent overall pressure at the excavation face is used. This approach based on an ideal case usually does not consider the ground conditions. And this consequently results in errors in calculation. In this presentation of a case study, a new approach of using blast waves obtained in the test blast is proposed. The approach was carried out in order to improve the accuracy in calculating blasting pressure. The stability of a structure in the vicinity of a slope blasting was examined using the newly proposed method.