scholarly journals Prediction of the peak velocity of blasting vibration based on various models at Ninh Dan quarry, Thanh Ba district, Phu Tho province

2020 ◽  
Vol 61 (4) ◽  
pp. 102-109
Author(s):  
An Dinh Nguyen ◽  
Hieu Quang Tran ◽  
Bao Dinh Tran ◽  
Phonepaserth Soukhanouvong ◽  
Keyword(s):  
Peak Velocity ◽  
Mining Industry ◽  
Ground Vibration ◽  
Blasting Vibration ◽  
Blasting Operation ◽  
Surface Mines ◽  
Forecasting Models ◽  
Surrounding Environment ◽  
Vibration Wave ◽  
The Impact

In mining industry, blasting operation is effective method to fragment rocks, supporting for the next operations in surface mines such as loading, and hauling works. However, blasting operation also impacts adversely on buildings and the surrounding environment, in which the vibration wave is one of the most severe impacts. Therefore, the implementation of the forecasting models of vibration speed contributes significantly to guarantee the safety of buildings located within the impact areas of the vibration wave. This paper employs the monitoring results of blasting activity at the Ninh Dan limestone quarry situated in Thanh Ba district, Phu Tho province, to develop different forecasting models that determine the effects of the ground vibration speed in the surrounding buildings. The results show that the models USBM and Ambraseys Hendron having more accuvate prediction than other models.

scholarly journals Experimental and Numerical Analysis and Prediction of Ground Vibrations Due to Heavy Haul Railway Viaduct

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Jingjing Hu ◽  
Yi Luo ◽  
Jiayun Xu
Keyword(s):  
Ground Vibration ◽  
Calculation Model ◽  
Vibration Velocity ◽  
Energy Index ◽  
Railway Line ◽  
Vibration Wave ◽  
Source Excitation ◽  
The Impact ◽  
The Relationship ◽  
Freight Wagons

The ground vibration wave induced by the viaduct section of the heavy freight wagons is transformed into the ground vibration problem under the condition of point source excitation after it is transmitted to soil through pier. When the speed and axle load of wagon become larger and larger, the impact on the surrounding buildings will also increase. In this paper, the ground vibration around Shenshan Village in section of Shuo-Huang railway line is monitored and numerical analyzed; the 3D numerical model of the Bridge-Pier-Field-House system is established. The relationship between peak vibration velocity (PPV) and the distance to the pier caused by heavy freight wagons at different speeds and different type of wagons is analyzed. The power function relationship between the two when measuring line perpendicular to the centerline of railway is verified. Based on the modified Sodev’s equation, the relationship between PPV of ground points and wagon speed, axle load, and soil properties is proposed, and the value of every parameter in the formula is discussed in detail. The concept of energy index is put forward for the first time in the formula, and the relationship between energy index and wagon speed and wagon weight is analyzed by regression analysis. The accuracy of the calculation model and prediction formula is verified by comparing field test results; an analytical method is proposed to predict the ground vibration induced by viaduct.

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 Laws of Ground Particles Cause by Shallow Tunnel Blasting Construction

2013 ◽  
Vol 838-841 ◽  
pp. 1420-1424
Author(s):  
Jun Tao Wang ◽  
Qing Yang ◽  
Hai Liang Wang
Keyword(s):  
Velocity Vector ◽  
Peak Velocity ◽  
Ground Vibration ◽  
Measured Data ◽  
Vibration Monitoring ◽  
Blasting Vibration ◽  
Shallow Tunnel ◽  
Working Face ◽  
Resultant Velocity ◽  
Tunnel Blasting

In order to study ground vibration laws of shallow tunnel blasting construction, so in this paper, we put Third Bid of Qingdao Metro Line 3 as the engineering background, selecting the monitoring segment blasting vibration monitoring, studying blasting vibration peak velocity. Basing on the measured data, analyzing the variation regularity resultant velocity vector peak velocity along the tunnel axis direction. The study found that resultant velocity vector peak did not occur just above the tunnel workface, but away from the working face in 1m ~ 1.5m the range. resultant velocity vector peak located in front of the workface is 1.02 to 1.45 times of resultant velocity vector peak located behind of the workface. resultant velocity vector peak located in front of the workface is 2.26 to 2.5 times of resultant velocity vector peak above the workface. resultant velocity vector peak behind the workface is 2.3 to 3 times of resultant velocity vector peak above the workface.

scholarly journals Assessment and Prediction of BIGV using Different Attenuation Equation in Opencast Mine

2020 ◽  
Vol 9 (4) ◽  
pp. 2296-2303
Keyword(s):  
Ground Vibration ◽  
Mineral Resources ◽  
Design Parameters ◽  
Opencast Mining ◽  
Blasting Operation ◽  
Blast Design ◽  
Opencast Mine ◽  
Surrounding Environment ◽  
Survey Line ◽  
Negative Effect

The Drilling and blasting play an important role in opencast mining for exploration and excavation of mineral resources. At the same time, they have some adverse effects on surrounding environment as well as nearby community and structures. The Peak particle velocity (PPV) is the most effective parameter for evaluation of blast-induced ground vibration (BIGV). A number of researchers established an attenuation equation and gave permissible level for structures and environment on the basis of PPV and frequency (i.e. USBM, IS DGMS, DIN, etc.). A total number of 46 datasets have been recorded at an interval of 25m & 50m from blast site to observation points along survey line and also acquire the row data like blast design parameters, explosive parameters, etc. in a Mine ‘B’ of Madhya Pradesh. The prediction of BIGV Velocity by different empirical predictor models have been made. These attenuation equations have been helpful to minimize the negative effect of BIGV and optimize the blast design parameters. The site-specific constant has been determined by regression statistical analysis. In the present study, correlation and comparison between the measured PPV and predicted PPV for the safe, smooth, and eco-environment blasting operation has been carried out. K

scholarly journals Evaluate impacts of ground vibration on construction projects and determine reasonable blasting scale for Phong Xuan limestone quarry in Thua Thien Hue province

2020 ◽  
Vol 61 (4) ◽  
pp. 118-125
Author(s):  
Hieu Quang Tran ◽  
An Đinh Nguyen ◽  
Bao Dinh Tran ◽  
Phonepaserth Soukhanouvong ◽  
Keyword(s):  
Construction Projects ◽  
Ground Vibration ◽  
Blasting Vibration ◽  
Measurement Equipment ◽  
Monitoring Equipment ◽  
Limestone Quarry ◽  
Limestone Quarries ◽  
Vibration Wave ◽  
First Time

One of the advanced methods to evaluate the effects of blasting vibration wave on the constructions in need of protection surrounding limestone quarries is to use measurement equipment, according to Norm QCVN 02:2008/BCT of Ministry of Industry and Trade (Vietnam). It is the first time in Vietnam when the authors employ the blasting monitoring equipment MR3000BLA made of Bartec Syscom (Switzerland). The equipment is integrated with the new 4.0 technology to measure the effects of blasting vibration waves on the constructions in need of protection surrounding and determine the reasonable size of blasting for Phong Xuan limestone quarry in Thua Thien Hue province.

scholarly journals Use of Multi-Anionic Sodium Tripolyphosphate to Enhance Dispersion of Concentrated Kaolin Slurries in Seawater

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1085
Author(s):  
Williams Leiva ◽  
Norman Toro ◽  
Pedro Robles ◽  
Edelmira Gálvez ◽  
Ricardo Ivan Jeldres
Keyword(s):  
Rheological Properties ◽  
Fine Particles ◽  
Sodium Tripolyphosphate ◽  
Mining Industry ◽  
Chord Length ◽  
Water Recovery ◽  
Reflectance Measurement ◽  
Anionic Charge ◽  
Free Environment ◽  
The Impact

This research aims to analyze the impact of sodium tripolyphosphate (STPP) as a rheological modifier of concentrated kaolin slurries in seawater at pH 8, which is characteristic of copper sulfide processing operations. The dispersion phenomenon was analyzed through chord length measurements using the focused beam reflectance measurement (FBRM) technique, complementing size distributions in unweighted and square-weighted modes. The reduction of the rheological properties was significant, decreasing from 231 Pa in a reagent-free environment to 80 Pa after the application of STPP. A frequency sweep in a linear viscoelastic regime indicated that by applying a characteristic dosage of 0.53 kg/t of STPP, the pulp before yielding increases its phase angle, which increases its liquid-like character. Measurements of the chord length verified the dispersion of particles, which showed an apparent increase in the proportion of fine particles and a reduction of the coarser aggregates when STPP was applied. Measurements of the zeta potential suggested that the high anionic charge of the reagent (pentavalent) increases the electrostatic repulsions between particles, overcoming the effect of cations in seawater. The results are relevant for the mining industry, especially when the deposits have high contents of complex gangues, such as clays, that increase the rheological properties. This increases the energy costs and water consumption needed for pumping the tailings from thickeners to the tailing storages facilities. The strategies that allow for the improvement of the fluidity and deformation of the tailings generate slack in order to maximize water recovery in the thickening stages.

The impact of the integrated reporting framework on corporate social responsibility (CSR) disclosures – the case of South African mining companies

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Barry Ackers ◽  
Susanna Elizabeth Grobbelaar
Keyword(s):  
Corporate Social Responsibility ◽  
Social Responsibility ◽  
South African ◽  
Mining Industry ◽  
Integrated Reporting ◽  
Content Type ◽  
Stakeholder Orientation ◽  
Mining Companies ◽  
Corporate Social ◽  
The Impact

Purpose Despite initially being lauded as a revolutionary approach for companies to account to all stakeholders, the shareholder orientation of the international integrated reporting (<IR>) framework gave rise to questions about whether integrated reports would still sufficiently disclose pertinent corporate social responsibility (CSR) information. This paper aims to investigate the extent to which the <IR> framework has impacted the CSR disclosures contained in integrated reports of South African mining companies. Design/methodology/approach The study deployed a mixed methods research approach, involving thematic content analysis of the CSR disclosures contained in the integrated reports of mining companies with primary listings on the Johannesburg Stock Exchange. The resultant qualitative data were subsequently analysed using a T-test of difference. Findings The study observes that the release of the <IR> framework appears to have had a limited impact on the CSR disclosures in the integrated reports of most companies included in the study. However, where significant differences were identified, the CSR disclosures of some companies were positively impacted after the release of the <IR> framework, whilst others were negatively impacted. Research limitations/implications As South Africa is acknowledged as a leader in the global <IR> movement, the paper’s observations have global relevance and suggest that the fundamental principles of <IR> should be reconsidered to improve the alignment with stakeholders’ information needs, as originally conceived. Originality/value Despite the shareholder orientation of the <IR> framework, the global mining industry is acknowledged as being at the forefront of implementing CSR interventions to mitigate the adverse impacts of their operations on stakeholders, supporting a stakeholder orientation. As the adoption of <IR> continues to gain traction around the world, this paper’s contribution is that it represents one of the few papers to use the global reporting initiative G4 indicators to specifically examine the impact of <IR> framework on the CSR disclosures on the South African mining industry, where both <IR> and CSR reporting are quasi-mandatory disclosure requirements.

scholarly journals Ernst May and the Campaign to Resettle the Countryside: Rural Housing in Silesia, 1919-1925

2002 ◽  
Vol 61 (2) ◽  
pp. 188-211 ◽  
Author(s):  
Susan R. Henderson
Keyword(s):  
Social Order ◽  
Mining Industry ◽  
Rural Housing ◽  
Housing Program ◽  
Third Way ◽  
Modern Approach ◽  
Cultural Traditions ◽  
The Veil ◽  
The Moment ◽  
The Impact

In 1919 Ernst May became the head of rural housing for the province of Silesia in eastern Germany. Silesian agriculture had long suffered from rural flight. The situation worsened in 1922 when the partition brokered by the Allies brought chaos in the mining industry and a flood of refugees. As head of the provincial stabilization effort called interior colonization, May was in charge of settlement programs to aid three constituencies of special concern: the farmworkers, the miners, and the refugees. Between 1919 and 1923, Germany's national rural housing effort employed a contradictory strategy of modernization set within corporative ideology, a "third way" that trumpeted a quasi-feudal social order as a path to political accord. May's Silesian work chronicles the impact of Modernism and corporatism on early Weimar housing: his settlements for farmworkers and miners celebrated their unique cultural traditions, while he experimented in rationalization techniques to increase housing production and reduce costs. With corporatism's decline after Germany's return to economic stability in 1924, modernization was increasingly accepted as an unalloyed virtue, and the veil of corporatism lifted. In 1924, challenged by the circumstances of the refugee housing program just at the moment the corporative compromise came to an end, May engaged in a series of experiments in polychromy, prefabricated construction, mass production, and standardization that reflected a more purely modern approach to the housing problem.

scholarly journals Utilization of Electroplating Sludge as Subgrade Backfill Materials: Mechanical and Environmental Risk Evaluation

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Yu Zhang ◽  
Peixin Shi ◽  
Lijuan Chen ◽  
Qiang Tang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Content ◽  
Environmental Risk ◽  
Coal Fly Ash ◽  
Surrounding Environment ◽  
Electroplating Sludge ◽  
Backfill Materials ◽  
Standard Limit ◽  
The Impact

The electroplating sludge may pose serious threat to human health and surrounding environment without safe treatment. This paper investigated the feasibility of using electroplating sludge as subgrade backfill materials, by evaluating the mechanical properties and environmental risk of the cement-coal fly ash solidified sludge. In this study, Portland cement and coal fly ash are used to solidify/stabilize the sludge. After curing for 7, 14, and 28 days, the stabilization/solidification sludge specimens were subject to a series of mechanical, leaching, and microcosmic tests. It was found that the compressive strength increased with the increase of cement content, curing time, and the cement replacement by coal fly ash besides water content. Among these factors, the impact of water content on the compressive strength is most noticeable. It was observed that the compressive strength declined by 87.1% when the water content increased from 0% to 10%. Besides, leaching tests showed that the amount of leaching heavy metals were under the standard limit. These results demonstrated utilization of electroplating sludge in subgrade backfill material may provide an alternative for the treatment of electroplating sludge.

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