equipment for measuring sonic velocity in quarry blasting


study selection of blasting limits for quarries and

blast-induced ground vibration can be measured in three different ways; as acceleration velocity and displacement. acceleration is a measure of how quickly the point of interest changes velocity over a …

quarry & surface mines | instantel

by measuring the velocity of the vibrations induced by each hole in the blast you can calculate the required timing delay between holes or the required distance between holes and rows. since vibrations diminish as they travel farther away from the blast you need a geophone that can record vibrations in close proximity to the blast.

a new perimeter control blast design concept for

a new perimeter control blast design concept for underground metal/nonmetal drifting applications stephen r. iverson william a. hustrulid and jeffrey c. johnson department of health and human services centers for d isease control and prevention national institute for occupational safety and health

vibrations from instantaneous .p~nd millisecond …

portable accelerographs. the use of particle velocity to study vibrations from quarry blasting has received little attention in the past. a study of the published data on vibration levels that produce damage to residential structures showed that the particle velocity of the vibration was

ultrasonic testing - youtube

mar 12 2014 0183; 32;nondestructive testing - ultrasonic examination - basic principles of sound propagation and reflection in materials - basics of ultrasonic testing procedures - ultrasonic testing of a steel

drilling and blasting - wikipedia

drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics to break rock for excavation. it is practiced most often in mining quarrying and civil engineering such as dam tunnel or road construction. the result of rock blasting is …

chapter 8 blast design - national park service

situations may also require the adoption of a higher velocity more energetic explosive. where drilling and blasting conditions are both severe the operator should use explosives at least in the bottom one third of the drill hole. clearing the toe and therefore contributing to a smoother floor is a major asset to improve blast design

vibration standards

the blasting seismograph vibration monitor (example photo at left) is the most commonly used tool for measuring vibration and determining compliance with ground vibration standards. it is used in both blasting and construction settings in spite of some serious limitations in …

surface mine blasting near pressurized transmission …

surface mine blasting near pressurized transmission pipelines by david e. siskind1 mark s. stagg2 john e. wiegand3 and david l. schuhz4 abstract the u.s. bureau of mines and the state of indiana cooperated with amax coal co. and its consultants to determine the effects of coal mine overburden blasting on nearby pipelines. five

measurement of blast-induced ground vibrations and

measurement of blast -induced ground vibrations and seismograph calibration by marks. stagg 1 and alvin j engler2 abstract blast-induced ground vibrations from surface coal mine quarry and construction blasting were measured and analyzed for frequency content and duration characteristics. eighteen commercially available ground vibration

distribution restriction statement

large quarry blast pattern measuring 600 by 100 by 48 ft-----delays in milliseconds----- 173; distribution of inclined holes for a road cut in uneven topography. regular hole array dis 173; torted to fit topography----- 173; charge distribution in bench blasting-----

measurement in blast hole stem and influence of …

measurement in blast hole stem and influence of test i – “ivanec” quarry velocity of detonation was measured in 5 blast-holes. stem material changed other parameters equal. blasting measurement cable equipment and connector were used with vodmate instrument.

blast vibration course measurement - assessment - …

this shows the wavetrace for a rhyodacite quarry where 108 holes in 2 rows were fired with an average charge mass of 127 kg per hole. the monitoring station was at a distance of 335 metres.

air blast measurement technology

of measurement technology for the study of air blast phenomena. this project represents an effort toward improvements in exist-ing sensors and measurement practices through understanding and dissemination of information as well as a search for techniques to measure parameters that are being measured with limited success or not at all. 1.2 scope

determining minimum burdens for quarry blasting

for quarry blasting by ken logan . purpose of this talk easily loaded using the equipment that is operated at the quarry face; key considerations in blast design explosives with the same velocity of detonation can have different densities . the use of powder factor in

187; west virginia code 22-4-13 – blasting restrictions

terms used in west virginia code 22-4-13. director: means the director of the division of environmental protection and his or her authorized agents.see west virginia code 22-4-3; division: means the division of environmental protection.see west virginia code 22-4-3; offense: includes every act or omission for which a fine forfeiture or punishment is imposed by law.

let's blast! - industrial explosives during blasting #

sep 12 2018 0183; 32;• blasting experience of the mine • delay systems powder factor and pounds per delay • type and amount of explosive material and • type and amount of stemming. #blasting #mining #

control and documentation studies of the impact of

control and documentation studies of the impact of blasting on buildings in the surroundings of open pit mines. r−distance between the measuring point and the blasting works. conducted by a specialist company with additional measurement equipment and specialist software enable monitoring of more structures and making independent

full-scale tests for assessing blasting-induced vibration

here is the vibration velocity of the ground (particle velocity cm/sec) is the distance from the blasting source to the point of measurement (m) and is the amount of charge per delay (kg/delay). additionally and are constants that depend on the rock condition of geological features and the blasting condition and 1/2 or 1/3 is used for b.

explosives – mining and blasting

mar 01 2019 0183; 32;posts about explosives written by partha das sharma. a blasting agent is an explosive that: comprises ingredients that by themselves are non-explosive; c an only be detonated by a high explosive charge placed within it and not by a detonator. all blasting agents contain the following essential components :

blasting monitoring

it is usually performed with a triaxial velocity sensor with a full range of 250 mm/s (10 in/s) with the main axis oriented in the direction of the blast. air pressure monitoring. it is realized with a high pressure microphone able to measure up to 150 db(l) oriented in the direction of the blast.

noise and vibration from blasting

blasting noise must only be measured using noise measurement equipment having a lower limiting frequency of 2hz (- 3db response point of the measurement system) and a detector onset time of not greater than 100 microseconds as assessed in accordance with as –1259.1 clauses 8.5 and 10.4.

an integrated approach of signature hole vibration

tion point of the charge to the sensor for the sonic velocity measurement vary from 24 m to 50 m and the effects of rock joints and discontinuities on the sonic velocity were included in the measurement. figure 1. plan view of a typical production blast with the delay timing marked at each blast hole and monitor-ing layout for the present study.

air overpressure | agg-net

higher air overpressure was recorded at babarkot due to the wind effect (the quarry is situated near the coast of the arabian sea where high wind velocities often increase blast air overpressure). another blast at babarkot was performed with 990kg of explosives and a greater weight per delay of 192kg. the air overpressure recorded at 120m was

study selection of blasting limits for quarries and

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

timing of quarry blasts and its impact on seismic …

timing of quarry blasts and its impact on seismic effects 157 fig. 1 graphical recordings 1. blasting v = f (t) – bench blasting nr. 2278 2. blasting v = f (t) – bench blasting nr. 2279 and 3. blasting v = f (t) – bench blasting nr. 2281 in the včel 225;re quarry (dojč 225;r and

rock damage from small charge blasting in granite.

rock damage from small. charge blasting in granite by james j. olson' robert j. willard2 david e. fogelson3 and kenneth e. hjelmstad4 abstract the bureau of mines used microfracture density analysis of quartz grains

minimising noise and vibration from blasting activities

minimising noise from blasting including noise criteria measurement monitoring and recording. the ground-borne vibration doesn't exceed a peak particle velocity of: measure blasting noise with measurement equipment with a lower limiting frequency of 2hz (-3db response point of the measurement system) and a detector onset time of no

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equipment for measuring sonic velocity in quarry blasting