equipment for measuring sonic velocity in quarry blasting

INVESTIGATION ON TECHNIQUES TO CONTROL STRUCTURAL DAMAGE DUE TO BLASTING …

1. Introduction In Sri Lanka, blasting is common in the quarry industry, where rock breaking process is mainly done by detonating explosives charged in holes drilled in rock. Carbon, sulfur and sodium nitrate in black powder are used as detonating explosives. The

Air Velocity Meter | PCE Instruments

The Air Velocity Meter PCE-PDA 10L is a reliable differential pressure gauge for pressure measurement of gases in the range of ±20 kPa. The Air Velocity Meter PCE-PDA 10L has many different pressure measuring functions. - Measuring range: ± 20 kPa / ± 2.9 psi / ± 0.2 bar. - …

Structure Response and Damage Produced by Airblast From Surface …

This publication has been cataloged as follows: Structure response and damage produced by airblast from surface mining. (Report of investigations ; 8485) Bibliography: p. 68·74. Supt, of Docs. no.: I 28.23:8485, L Blast effect, 2, Blasting-Safety measures, 3-Blasting-Noise

Airblast Instrumentation and Measurement Techniques for Surface …

mercial sound measuring systems. In 1973, Siskind and Summers (32) surveyed airblast noise from conventional quarry blasting, using instruments with a variety of frequency responses. It was evident that much low-frequency energy (less than 2 Hz

ASSESSMENT OF THE GROUND VIBRATION GENERATED BY BLASTING …

vibration caused by the blasting. The seismic effect generated by blasting works in quarry is determined by a series of natural and technological factors that must be considered when studying the influence of environmental oscillations to objectives from the near

Gas sonic velocity calculation

The sonic velocity is the maximum velocity that can be reached by a gas in a pipe, or exiting from the system through an orifice or a nozzle for example. Knowing the sonic velocity is very important as the velocity of the gas will be "capped" by the sonic velocity, it cannot go quicker, which will induce some limitations for pressure safety valves for example.

Case Study Selection of Blasting Limits for Quarries and Civil …

standards. Velocity is measured with an instrument called a geophone. Acceleration is a less common way of measuring ground vibration. This is because it is not referred to in many blasting standards. However, manufacturers of sensitive equipment

Quarry News, Jobs, Materials Handling & Recycling …

Computer-based blasting models can help guide blast design choices, but it is important that users understand the limitations and constraints of such models. One model to rule them all…. The perfect blasting model would accurately predict the non-ideal detonation behaviour of explosives in all rock types and down-the-hole conditions. It would ...

The ability to model explosive, blast hole and whole-of-blast …

measuring the sonic velocity of the rock can be helpful in determining these values. Joint persistence, spacing and condition are also important. Many of the more complex vibration models require one or more "seed waves" that represent the waveform of a single

Blasting

Blasting Blasting March 20, 2018 | Author: Tuperna Kleist Rix | Category: Explosive Material, Rock (Geology), Science, Geology, Nature DOWNLOAD Share Report this link Comments Description ...

Gas sonic velocity calculation

V s = Sonic velocity (m/s) K = C p /C v around 1.4 for most diatomic gases R = 289.9 J/kg/K T = Absolute temperature ( K) 3. Critical pressure ratio How to …

Safety threshold of blasting vibration velocity in …

 · Blasting damage control is one of the main problems in the dam foundation excavation of Baihetan Hydropower Station, and it is important to study the relationship between the blasting vibration and blasting damage. In this paper, a horizontal presplit blasting experiment was carried out at the dam foundation. By combining vibration monitoring and sonic wave detection before and after blasting ...

Equipment For Measuring Sonic Velocity In Quarry Blasting

Equipment For Measuring Sonic Velocity In Quarry Blasting 2020-3-30Large quarry blast pattern measuring 600 by 400 by48 ft ----Delays, in milliseconds ----Distribution of inclined holes for a road cut in uneven topography. Regular hole array dis-torted to fit

Conferences

 · Technical Papers. Details. Published: January 17, 2014. The technical sessions will showcase the latest technological advances. Whether you''re a blaster in the field or a supervisor, you''ll find this an informative, enjoyable event. The following is a preliminary list of papers which will be presented in Orlando, Fla.

Prediction and Calculation of Construction Vibrations – …

 · The dominant frequency of propagating waves from quarry and construction blasting ranges mostly between 10 and 60 Hz. Blasting energy is much larger than energy of other sources of construction vibrations. For example, the energy released by 0.5 kg of TNT

Surface mineral workings: control of blasting

 · Blasting operations at surface mineral workings were controlled by the Quarries (Explosives) Regulations 1988. These regulations detailed the duties of the site owner, manager and shotfirer in the conduct of blasting operations. The health and safety implications of general quarry operations were controlled by The Quarries Miscellaneous Health ...

blast pattern – Mining and Blasting

 · This shock wave, which starts out at the velocity of the explosive, decreases quite rapidly once it enters the rock and in a short distance is reduced to the sonic velocity of that particular rock. Most rock has a compressive strength that is approximately 7 times higher than its tensile strength, i.e. it takes 7 times the amount of energy to crush it as it does to pull it apart.

Blasting vibration limits for quarries and civil construction …

 · Velocity is measured with an instrument called a geophone. Acceleration is a less common way of measuring ground vibration. This is because it is not referred to in many blasting standards. However, manufacturers of sensitive equipment such as computer hard

Vibration Standards

Blasting-Related Standards and Studies. By far the most commonly used blasting vibration standard in the U.S. is the U. S. Bureau of Mines, Office of Surface Mining (OSM) standard, [1] shown above. It was developed in the early 1980''s to address shortcomings of earlier, less stringent standards suggested by …

Research on the milisecond delay blasting impact in order to minimize seismic effects in Kučín quarry …

evaluation seismic effects blasting verified in a Kučín quarry are the methodological base for evaluating the seismic effects of blasting in all quarries in Slovakia. Keywords: blasting operations, seismic effect, particle velocity, seismic safety 1. Introduction

High Velocity Air-Fuel Spraying And Its Applications in Oil and Gas Industry

velocity and temperature were measured with Acuraspray G-3 (Tecnar, St. Bruno, QC, Canada). The hardware and spray process optimization was performed measuring the gas permeability of 40-50 micrometers thick coatings, deposited onto porous

MEASUREMENT IN BLAST HOLE STEM AND INFLUENCE OF STEMING MATERIAL ON BLASTING …

measurement cable, equipment and connector were used with VODMate instrument. Figure 4 „Očura" quary, Blast Hole Schematics Slika 4. Presjek minske bušotine- kamenolom Očura VODMate is measuring velocity continuously, giving real-time detonation

Vibroacoustic measurements and analysis of blasting …

Full sets of equipment for measuring ground and object vibration intensity, airblast pressure and noise level (acoustic wave) were used at each station. Distance from the blasting place to the measuring point No. 1 (Town 1): approx. 7.5 km, to the measuring point No. 2 (Town 2): approx. 6.5 km.

Investigating Vibration Effect from Blasting Using Delay Initiation and Square Drill Pattern in Limestone Quarry …

Peak particle velocity (PPV) measurement using slam stick X was compared for an undefined drilled borehole arrangement and drilled boreholes arranged in square pattern with 500 ms delayed in blasting …

Chapter 8 BLAST DESIGN

equipment and drilling equipment, fragmentation tolerance, and production demands, will also influence the ... situations may also require the adoption of a higher velocity, more energetic explosive. Where drilling and blasting conditions are both severe, the ...

Ground Vibration Monitoring

Likewise, quarry and mine operators monitor the vibration caused by blasts, compaction methods, and heavy machinery/equipment. In some instances, they use the monitors to measure the damaging air overpressure caused by a blast and fine tune their blasting techniques.

Case Study Selection of Blasting Limits for Quarries and Civil …

many blasting standards. However, manufacturers of sensitive equipment such as computer hard drives sometimes provide maximum vibration limits in terms of acceleration, measured in "g". Acceleration is also preferred to velocity when measuring vibration for

Blasting mechanics: Material properties and powder …

 · Read about the true influence rock strength, rock structure, velocity and powder factor have on a quarry blast''s effectiveness. In the 1960s, there was a large push to determine different sonic velocities of rock in order to match the velocity of the rock to the velocity of

Model rock blasting—effect of explosives properties and …

 · The granite used was from the E. L. Smith quarry in Barre, Vermont and has a compressive strength of about 30,000 psi, a tensile strength of about 1200 psi, a density of 2.66 g/cm3 and a sonic velocity of 5200 m/sec. (a) Effects of energy, pressure, detonation

Quarry News, Jobs, Materials Handling & Recycling …

Equipment and techniques have been outlined that allow for the monitoring of blast performance under quarry conditions. Exchem use this technology to test new products, for research and development, and as part of their quality-control system. There is also great potential for the use of this technology by quarry operators or drilling and ...

Blasting Vibrations

 · Blasting Vibrations. Blasting is, by far, the most-studied source of ground vibration, as the potential for that vibration to damage structures was recognized far earlier than that of construction heavy equipment. There is a large scientific and technical literature of blasting vibration effects on homes and other structures worldwide. [1]

Uncertainty in Measurements of Vibrations From Blasting

 · There are, nowadays, few studies that assess uncertainty in vibration measurements from blasting (Segarra et al. 2010 ). This work tries to fill this void, and reports and analyzes uncertainties for four measuring conditions that are representative of common field monitoring techniques.

(PDF) Prediction of near field overpressure from quarry …

IntroductionBench blasting is the most common method of rock excavation in quarries and surface mines. The drilling and blasting cycle consists of drilling one or more rows of blastholes parallel to the free vertical face of the bench and sufficiently close to it to break loose the rock in between [1]. The blastholes are charged with explosives ...

1. Introduction

In the present study, the laboratory experiment includes two important aspects: the first step is measuring the sonic wave velocity of different kinds of rock medium in different states. By controlling the temperature and humidity of the air, the rock mass could be in the state of dry, natural, saturated, and frozen conditions.