scholarly journals Problematic aspects of interpretation of seismic signals induced by detonation of explosives

2018 ◽  
Vol 66 ◽  
pp. 01015
Author(s):  
Józef Pyra ◽  
Michał Twardosz
Keyword(s):  
Acoustic Wave ◽  
Field Measurements ◽  
Open Pit ◽  
Seismic Signals ◽  
Building Structures ◽  
Open Pit Mines ◽  
Opencast Mines ◽  
The Impact ◽  
Technological Methods ◽  
Harmful Effects

The article presents problems concerning an interpretation of seismic signals registered in the ground and foundations of buildings which are induced by the detonation of explosives. In the course of blasting in opencast mines, harmful effects may occur. The primary impacts which usually occur are as listed, induced vibrations, airblast, acoustic wave and the flyrock. There are technical and technological methods to reduce them, but minimising one can enhance the impact of the other. Furthermore, impacts such as vibration, acoustic wave, and airblast may overlap - the additive effect, which might cause problems with the unambiguous identification and interpretation of the recordings. The paper presents the results of tests carried out on a laboratory scale of the detonation of varying weight explosives samples. Also, examples of seismic signals recorded during field measurements in the vicinity of open-pit mines are presented. Also, examples of seismic signals recorded during field measurements in the vicinity of open-pit mines are presented. These examples confirm doubt as to the applicability of PN-B-02170: 2016-12 to assess the effects of vibrations on the building structures in the event of a significant impact of the airblast.

scholarly journals The use of vibration monitoring to record the blasting works impact on buildings surrounding open-pit mines

2018 ◽  
Vol 36 ◽  
pp. 02008
Author(s):  
Anna Sołtys ◽  
Józef Pyra ◽  
Jan Winzer
Keyword(s):  
Environmental Protection ◽  
Negative Impact ◽  
Vibration Monitoring ◽  
Automated System ◽  
Open Pit ◽  
Mining Operations ◽  
Open Pit Mines ◽  
Guiding Principle ◽  
The Impact ◽  
Mining Plant

Environmental protection law and geological and mining law require the mineral mining plant to protect its surroundings from the effects of mining operations. This also applies to the negative impact of vibrations induced by blasting works on people and construction facilities. Effective protection is only possible if the level of this impact is known, therefore it is necessary to record it. The thesis formulated in this way has been and continues to be the guiding principle of the research works carried out in the AGH Laboratory of Blasting Work and Environmental Protection. As a result of these works are procedures for conducting preventive activities by open-pit mines in order to minimize the impact of blasting on facilities in the surrounding area. An important element of this activity is the monitoring of vibrations in constructions, which is a source of knowledge for excavation supervisors and engineers performing blasting works, thus contributing to raising the awareness of the responsible operation of the mining plant. Developed in the Laboratory of the Mine's Vibration Monitoring Station (KSMD), after several modernizations, it became a fully automated system for monitoring and recording the impact of blasting works on the surrounding environment. Currently, there are 30 measuring devices in 10 open-pit mines, and additional 8 devices are used to provide periodic measurement and recording services for the mines concerned.

An Approach to the Forecasting of Debris Flow Hazard by Storms from Large Waste-Dump at Open Pit Mines

2014 ◽  
Vol 1065-1069 ◽  
pp. 2337-2341
Author(s):  
Xiao Fei Jing ◽  
Ke Hui Liu ◽  
Zhi Yong Cai ◽  
Xiao Zhou
Keyword(s):  
Debris Flow ◽  
Flow Control ◽  
Open Pit ◽  
Waste Dump ◽  
Research Project ◽  
Open Pit Mines ◽  
Flow Motion ◽  
The Impact ◽  
Debris Flow Hazard ◽  
Debris Flow Disaster

In order to explore the impact of debris flow in large waste-dump which under the situation of rainstorm could cause disasters to the downstream region of the life and property; the research project has chosen a large waste-dump as the engineering background in Jiuzhaigou, Sichuan. According to the theory of the debris flow motion, we have made a deep analysis about the possibilities that waste-dump could cause debris flow disaster under the different frequency of rainstorm; and carried on the forecast analysis about the scope and degree of the calamity in the downstream which caused by the debris flow. The results can provide a reference for debris flow control in the lower reaches.

Improved Ingress/Egress System for Large Mining Trucks

1978 ◽  
Vol 22 (1) ◽  
pp. 354-354 ◽  
Author(s):  
Ernest J. Conway ◽  
Barton K. Cross
Keyword(s):  
Open Pit ◽  
Open Pit Mines ◽  
Secondary Tasks ◽  
Design Considerations ◽  
Operator Functions ◽  
Accident Data ◽  
Lost Time ◽  
The Impact ◽  
The U.S ◽  
Relevant Factors

Analyses of mining accident data suggest that approximately 40% of all lost time injuries in open-pit mines occur while mobile equipment operators are ascending or decending their vehicles. This study, sponsored by the U.S. Bureau of Mines examined the human factors and engineering design considerations contributing to these accidents and possible solutions to the problem. The analysis included such relevant factors as type and frequency of injuries, biomechanics of ascending/decending current ingress/egress systems, operational damage sustained by current ingress/egress hardware, operating environmental considerations (e.g., terrain, mud, ice, spilled lubricants/fuels, etc.) operator functions performed from ladders and platforms and secondary tasks performed while ascending/decending. The impact of emergency egress requirements was also addressed. Alternate improved designs were defined and evaluated. The best was fabricated and is currently being field tested.

scholarly journals Influence of dynamics of development of open mining on technological features of blasting breaking

2018 ◽  
Vol 56 ◽  
pp. 01001
Author(s):  
Sergey Zharikov ◽  
Vyacheslav Kutuev
Keyword(s):  
Energy Efficiency ◽  
Rock Mass ◽  
Traditional Approach ◽  
Open Pit ◽  
Resource Saving ◽  
Open Pit Mines ◽  
The Cost ◽  
Near Future ◽  
Technological Methods ◽  
Development Prospects

The paper desribes the results of the analysis of the drilling and blasting index at some large enterprises. The significant period of their work has been considered. The increase in the specific consumption of explosives by years has been shown and the reasons for this increase have been explained. The issue of the development prospects of the drilling and blasting complex in terms of reducing the cost of explosives, as well as some issues associated with the use of explosives, manufactured on site. It is suggested that in the near future the development of open mining will be associated with the acceleration of processes and a significant increase in their intensity, both in the development of new ones and in the refinement of existing large open-pit mines. In this regard, drilling and blasting operations are waiting for certain changes in both the mechanization of processes and the technological methods of production. An approach is proposed for improving energy efficiency and resource saving in the production of drilling and blasting operations, which consists in applying a horizontal cut along the bottom of the bench with blasting breaking of the rock mass. It has been previously shown that the use of this method of breaking can be quite effective in comparison with the traditional approach.

scholarly journals Exploring the Relation between Seismic Coefficient and Rock Properties Through Field Measurements and Empirical Model for Evaluating the Effect of Blast-Induced Ground Vibration in Open- Pit Mines: A Case Study at the Thuong Tan III Quarry (Vietnam)

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Quang Hieu TRAN
Keyword(s):  
Empirical Model ◽  
Empirical Equation ◽  
Ground Vibration ◽  
Field Measurements ◽  
Open Pit ◽  
Rock Properties ◽  
Open Pit Mines ◽  
Surrounding Environment ◽  
The Stability

Blasting is one of the most effective methods for fragmenting rock in quarries. Nevertheless, itsadverse effects are significant, especially blast-induced ground vibration. Field measurement andempirical equations are simple methods to determine and estimate the intensity of blast-induced groundvibration. However, we cannot evaluate the effects of blast-induced ground vibration on the surroundingenvironment based on these outcomes. Therefore, this study explores the relation between seismiccoefficient and rock properties through field measurements and an empirical model for evaluating theeffect of blast-induced ground vibration in open-pit mines. Accordingly, the seismic coefficient (K) isconsidered the main objective in this study. Firstly, it was determined based on the rock properties.Subsequently, an empirical model for estimating blast-induced ground vibration was developed based onfield measurements. This empirical equation was then expanded to determine K to check whether itmatches the determined K by the rock properties. Finally, it was used as the threshold to determine themaximum explosive charged per delay to ensure the safety of the surrounding environment from blastinducedground vibration. For this aim, the Thuong Tan III quarry (in Binh Duong province, Vietnam)was selected as a case study. Fifth-teen blasting events with a total of 75 blast-induced ground vibrationvalues were recorded and collected. An empirical equation for estimating blast-induced ground vibrationwas then developed based on the collected dataset, and K was determined in the range of 539 to 713 forthe Thuong Tan III quarry. Based on the measured blast-induced ground vibrations, developed empiricalmodel, and K values, the Phase 2 software was applied to simulate the effects of blast-induced groundvibration on the stability of slopes as one of the impacts on the surrounding environment. From thesimulation results, we can determine the maximum explosive charged per delay for each type of rock toensure the stability of the slope.

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