A Re-Look Into Modified Scaled Distance Regression for Prediction of Blast-Induced Ground Vibration

2021 ◽  
Vol 12 (1) ◽  
pp. 22-39
Author(s):  
Saha Dauji
Keyword(s):  
Performance Measures ◽  
Ground Vibration ◽  
Blast Waves ◽  
Charge Weight ◽  
Mining Activities ◽  
Weight Estimation ◽  
Industrial Practice ◽  
Scaled Distance ◽  
Conservative Values ◽  
Distance Approach

Underground blasts are conducted for deep excavations, tunneling, or mining activities. Scaled distance regression analysis is performed in industry to estimate peak particle velocity from charge weight and distance. For addressing the uncertainties in estimating safe charge weight for controlled blasting, 95% confidence expression is generally used. For addressing inaccuracies arising from superimposition of blast waves in multi-hole blasting when using attenuation equation developed from single-hole blast data, a modified approach was proposed in literature. This article presents comparisons to establish that industrial practice of scaled distance regression would be as satisfactory as the proposed modified approach, when various performance measures (including parsimony) are considered together. Furthermore, industrial practice of using 95% confidence expression generated from sufficient data (say, 40 numbers) would result in safe charge weight estimation, whereas modified scaled distance approach (mean expression) could still result in few non-conservative values.

scholarly journals ANALISIS GETARAN PELEDAKAN TERHADAP PABRIK PENGOLAHAN EMAS PT. AGINCOURT RESOURCES, TAPANULI SELATAN, SUMATERA UTARA

2020 ◽  
Vol 1 (1) ◽  
pp. 411-420
Author(s):  
Pantjanita N Hartami ◽  
Taat T Purwiyono ◽  
Handoyo M ◽  
Rudolf Rudolf ◽  
Yuga M ◽  
...  
Keyword(s):  
Gold Mining ◽  
Ground Vibration ◽  
National Standard ◽  
Measuring Instruments ◽  
Processing Plant ◽  
Mining Activities ◽  
Mining Operations ◽  
Vibration Measurements ◽  
Scaled Distance ◽  
North Sumatra

ABSTRAK Getaran tanah merupakan salah satu efek peledakan yang harus diperhatikan terutama pada saat aktivitas penambangan berada di dekat bangunan penting dan masyarakat. Penambangan emas PT. Agincourt Resources di Tapanuli Selatan, Sumatera Utara, Indonesia melakukan operasi penambangan di 2 pit yaitu pit Purnama dan pit Barani. Posisi pit Purnama berdekatan dengan processing plant yang digunakan sebagai tempat peleburan dan pemurnian emas dengan jarak sekitar ±30 m, sedangkan Pit Barani yang berjarak sekitar 1200 meter dari perumahan penduduk. Paper ini difokuskan pada penelitian untuk mengantisipasi pengaruh getaran peledakan di pit Purnama terhadap processing plant. Penelitian dilakukan dengan mengukur getaran hasil peledakan menggunakan dua alat ukur Blasmate dan Micromate yang diletakkan di depan freeface dan di belakang freeface. Pengukuran ini bertujuan memprediksi bahan peledak per delay agar getaran hasil peledakan tidak berpengaruh terhadap bangunan. Analisis dilakukan dengan menggunakan persamaan scale distance dan software Shotplus sehingga dapat ditentukan prediksi jumlah bahan peledak per delay di setiap jarak. Dengan mengacu standar perusahaan, dan SNI 7570:2010maka akan dilakukan standarisasi jumlah bahan peledak per delay yang diijinkan Kata Kunci:  getaran peledakan, pabrik pengolahan, scaled distance, shotplus, Standar Nasional Indonesia  ABSTRACT Ground vibration is blasting effect that must be considered especially when mining activities are located near important buildings and communities. The activities of gold mining of PT. Agincourt Resources in Tapanuli Selatan, North Sumatra, Indonesia conducts mining operations in two pits, namely Purnama Pit and Barani Pit. Purnama Pit which is adjacent to a processing plant which is used as a gold smelting and refining with a distance of about ± 30 m, and Barani Pit which is about 1200 meters from village. This paper focused to anticipate damage to the processing plant. The ground vibration measurements were carried out using 2 measuring instruments that placed in front of the freeface and behind the freeface. This measurement aims to predict charged per delay on each distance so that the ground vibration have no effect on the processing plant. The analysis was carried out by using the scaled distance and Shotplus software. Based on the analysis and referred to Indonesian National Standard for ground vibration, then charge per delay was determined Keyword : ground vibration, processing plant, scaled distance, shotplus, Indonesian National Standard

Investigating ground vibration to calculate the permissible charge weight for blasting operations of Gotvand-Olya dam underground structures / Badania drgań gruntu w celu określenia dopuszczalnego ciężaru ładunku wybuchowego przy pracach strzałowych w podziemnych elementach tamy w Gotvand-Olya

2012 ◽  
Vol 57 (3) ◽  
pp. 687-697 ◽  
Author(s):  
Saeed Soltani-Mohammadi ◽  
Hassan Bakhshandeh Amnieh ◽  
Moein Bahadori
Keyword(s):  
Minimum Distance ◽  
Hybrid Methods ◽  
Ground Vibration ◽  
Charge Weight ◽  
Underground Structures ◽  
Scaled Distance ◽  
Maximum Charge ◽  
Safe Level ◽  
Surrounding Environment

Abstract Ground vibration, air vibration, fly rock, undesirable displacement and fragmentation are some inevitable side effects of blasting operations that can cause serious damage to the surrounding environment. Peak Particle Velocity (PPV) is the main criterion in the assessment of the amount of damage caused by ground vibration. There are different standards for the determination of the safe level of the PPV. To calculate the permissible amount of the explosive to control the damage to the underground structures of Gotvand Olya dam, use was made of sixteen 3-component (totally 48) records generated from 4 blasts. These operations were recorded in 3 directions (radial, transverse and vertical) by four PG-2002 seismographs having GS-11D 3-component seismometers and the records were analyzed with the help of the DADISP software. To predict the PPV, use was made of the scaled distance and the Simulated Annealing (SA) hybrid methods. Using the scaled distance resulted in a relation for the prediction of the PPV; the precision of the relation was then increased to 0.94 with the help of the SA hybrid method. Relying on the high correlation of this relation and considering a minimum distance of 56.2 m to the center of the blast site and a permissible PPV of 178 mm/s (for a 2-day old concrete), the maximum charge weight per delay came out to be 212 Kg.

scholarly journals Monitoring the Dynamic Response of a Buried Polyethylene Pipe to a Blast Wave: An Experimental Study

2019 ◽  
Vol 9 (8) ◽  
pp. 1663 ◽  
Author(s):  
Zhong ◽  
Gong ◽  
Han ◽  
Li
Keyword(s):  
Dynamic Response ◽  
Ground Vibration ◽  
Average Frequency ◽  
Blast Waves ◽  
Dynamic Strain ◽  
Vibration Velocity ◽  
Hoop Strain ◽  
Scaled Distance ◽  
Charge Mass ◽  
Explosive Source

Although the use of polyethylene (PE) pipelines has become increasingly widespread in recent years, few studies have addressed their seismic design and ability to withstand blast waves. In order to establish their seismic capacity, the dynamic response of buried pipelines subjected to blast waves must be explored in depth. Here, we studied the dynamic response of PE pipes situated near an explosive source. Time histories of dynamic strains were measured by conventional strain gauges after simple waterproof treatment, and pipe and ground vibration velocity curves were obtained. Based on the experimental data, the attenuation law of the peak strains under the conditions of different charge masses and blast center distances was analyzed, and the spectrum characteristics of strain, velocity of the pipe, and ground velocity were studied. The results revealed that a large hoop strain on the PE pipes was produced due to the local impact near the explosive source. We found that peak hoop strain (PHS) or peak axial strain (PAS) had a power attenuation relationship with the scaled distance, and this relationship could also be derived by dimensional analysis. The average frequency of strains had the same attenuation form as the charge mass, which was between 10 Hz and 50 Hz. Additionally, the vibration of the pipe showed a low frequency. We also determined that the attenuation of the average frequency of pipe and ground vibration velocity was closely related to the charge mass and the scaled distance. Pipe peak vibration velocity (PPVV), ground peak particle velocity (GPPV), and the peak dynamic strain of pipe were highly positively correlated, which verifies the feasibility of using GPPV to characterize pipeline vibration and strain level. Thus, a blasting criterion of 10% minimum request strength (MRS) for PE pipe was proposed, which means that the additional PHS or PAS of the dangerous point must be less than 10% MRS, and we also propose limiting the safety distance–charge mass for blasts near buried PE pipelines by the criterion. Some results in this paper can serve as the basis for future in-depth theoretical research.

Characteristics of Free Air Blast Loading Due to Simultaneously Detonated Multiple Charges

2014 ◽  
Vol 14 (04) ◽  
pp. 1450002 ◽  
Author(s):  
Nimasha Weerasingha Mohottige ◽  
Chengqing Wu ◽  
Hong Hao
Keyword(s):  
Numerical Simulation ◽  
Pressure Ratio ◽  
Mesh Size ◽  
Blast Load ◽  
Charge Weight ◽  
Single Charge ◽  
Air Blast ◽  
Scaled Distance ◽  
Free Air ◽  
Blast Resistant Design

Extensive research has been conducted to investigate the characteristics of blast load due to single charge explosion, including numerical simulations and experimental blast tests in both unconfined and confined environments. Further, available guidelines for blast resistant design such as UFC-3-340-02 (2008) and ASCE 59-11 (2011) provide details to predict blast loads on a structure subjected to single charge explosion. However, blast load characteristics due to multiple charge explosions are poorly discussed in available literature. In this paper, commercially available Hydrocode, AUTODYN is calibrated for single charge explosions. Based on a comparison between numerical simulation and UFC prediction, correction factors for peak reflected pressure and positive reflected impulse as a function of charge weight, scaled distance and mesh size of the numerical model are proposed to minimize the errors in simulations. The calibrated AUTODYN model is then used to conduct parametric studies to investigate the effects of charge weight, scaled distance, number of charges and distance between the charges on the characteristics of free air blast load due to simultaneous detonated multiple charges. Numerical simulation results are used to derive analytical formulas for predictions of peak reflected pressure ratio and positive reflected impulse ratio between single and multiple explosions. The discussion is made on characteristics of free air blast load due to simultaneous detonated multiple charges.

Dynamic Response of RC Structures Subjected to Blast Wave Shock Loading

2012 ◽  
Author(s):  
Oruba Rabie ◽  
Yahia M. Al-Smadi
Keyword(s):  
Blast Wave ◽  
Blast Waves ◽  
Charge Weight ◽  
Structural Components ◽  
Reinforced Concrete Column ◽  
Safety Criterion ◽  
Rc Structures ◽  
The Past ◽  
Blast Wave Propagation ◽  
The Stability

The collapse of significant structures caused by terrorist attacks in the past decades has motivated engineers to study the stability of current structural systems and their susceptibility to collapse. This collapse usually occurs due to blast waves generated by the high explosive bursts in the air that hit the structural components of the buildings leading to catastrophic damages which unfortunately happen before the evacuation. In an effort to find a safety criterion for buildings subjected to blasting; this study uses the nonlinear FEA explicit software LS-DYNA to highlight the effect of blast wave propagation on reinforced concrete column taking into account the standoff distance and charge weight variations. The effects of these two variables have been quantified through the comparison of resulted pressures, displacement and impulses.

scholarly journals Evaluasi Isian Bahan Peledak Berdasarkan groundvibration Hasil PeledakanOverburdenpada PT Bina Sarana Sukses KecamatanSungai Raya Kabupaten Hulu Sungai Selatan Provinsi Kalimantan Selatan

2017 ◽  
Vol 14 (1) ◽  
pp. 8 ◽  
Author(s):  
Rusmawarni Rusmawarni ◽  
Nurhakim Nurhakim ◽  
Riswan Riswan ◽  
Ferdinandus Ferdinandus
Keyword(s):  
Ground Vibration ◽  
Scaled Distance ◽  
Propagation Law

PT Bina Sarana Sukses merupakan perusahaan kontraktor tambang batubara yang bekerja melayani operasi produksi untuk PT Antang Gunung Meratus di Pit Warute. Salah satu kegiatan penambangan adalah pengupasan lapisan penutup dengan cara pemboran dan peledakan. Indikator keberhasilan selain tercapainya target produksi peledakan, antara lain fragmentasi dan ground vibration. Dimana ukuran fragmen yang dihasilkan berpengaruh untuk proses penggalian overburden yang terledakkan yang mempengaruhi kinerja alat gali muat dengan tidak mengesampingkan getaran peledakan yang ditimbulkan. Geometri peledakan yang digunakan yaitu burden 8 m x spasi 9 m dengan kedalaman lubang bervariasi antara 5 m sampai 8 m. jarak pengukuran ground vibration  400 m sampai 600 m dari lokasi peledakan. Semakin besar jumlah isian bahan peledak yang digunakan semakin besar pula ground vibration yang dihasilkan, maka jumlah isian bahan peledak harus dikurangi untuk mengurangi ground vibration yang dihasilkan. Alat yang digunakan untuk pengukuran ground vibration adalah Minimate dari Instantel. Metode analisa hasil peledakan menggunakan analisa perbandingan dan regresi. Dari hasil analisa, didapatkan simulasi jumlah isian bahan peledak dengan nilai PPV yang disimulasikan sebesar 2 mm/s. Dengan menggunakan rumus scaled distance maka direkomendasikan jumlah isian bahan peledak pada jarak 400 sebesar 57,45 kg/lubang, jarak 450 m sebesar 72,71 kg/lubang, jarak 500 sebesar 89,76 kg/lubang dan jarak 600 m sebesar 129,26 kg/lubang. Sedangkan dengan menggunakan rumus propagation law maka dapat direkomendasikan jumlah isian bahan peledak pada jarak 400 m yaitu sebanyak 103,04 kg/delay, pada jarak 450 m yaitu sebanyak 130,41 kg/delay, pada jarak 500 m yaitu sebanyak 161 kg/delay dan pada jarak 600 m yaitu sebanyak 231,84 kg/delay.

Safe Vibrations of Spilling Basin Explosions at “Gotvand Olya Dam” Using Artificial Neural Network

2014 ◽  
Vol 59 (4) ◽  
pp. 1087-1096 ◽  
Author(s):  
Hassan Bakhshandeh Amnieh ◽  
Moein Bahadori
Keyword(s):  
Back Propagation ◽  
Ground Vibration ◽  
Charge Weight ◽  
Blasting Operation ◽  
Accuracy And Precision ◽  
Recording Station ◽  
The Mean ◽  
Artificial Neural ◽  
Determining Factor ◽  
Undesirable Outcome

Abstract Ground vibration is an undesirable outcome of an explosion which can have destructive effects on the surrounding environment and structures. Peak Particle Velocity (PPV) is a determining factor in evaluation of the damage caused by an explosion. To predict the ground vibration caused by blasting at the Gotvand Olya Dam (GOD) spilling basin, thirty 3-component records (totally 90) from 19 blasts were obtained using 3 VIBROLOC seismographs. Minimum and the maximum distance from the center of the exploding block to the recording station were set to be 11 and 244 meters, respectively. To evaluate allowable safe vibration and determining the permissible explosive charge weight, Artificial Neural Networks (ANN) was employed with Back Propagation (BP) and 3 hidden layers. The mean square error and the correlation coefficient of the network in this study were found to be 1.95 and 0.995, respectively, which compared to those obtained from the known empirical correlations, indicating substantially more accurate prediction. Considering the network high accuracy and precision in predicting vibrations caused by such blasting operations, the nearest distance from the center of the exploding block at this study was 11 m, and considering the standard allowable vibration of 120 mm/sec for heavy concrete structures, the maximum permissible explosive weight per delay was estimated to be 47.00 Kg. These results could be employed in subsequent safer blasting operation designs.

Modeling and Simulation of Tool Cycle in Manufacturing Cell

2010 ◽  
Vol 165 ◽  
pp. 262-267
Author(s):  
Michal Dobrzynski
Keyword(s):  
Modeling And Simulation ◽  
Performance Measures ◽  
Interactive Simulation ◽  
Industrial Practice ◽  
Modeling And Analysis ◽  
Manufacturing Cell ◽  
Control Rules ◽  
Prismatic Parts ◽  
Tool Allocation

The paper addresses issues concerning modeling and analysis of tool flow within a three-machine manufacturing cell used for small batch manufacturing of a definite spectrum of prismatic parts. The approach utilizes a method for job and tool allocation to work centers with limited number of machines and capacity of tool resources, based on the analysis of formalized relations: job - tool sets required. Selected tool flow control rules are considered with respect to assumed performance measures of such machining cell. These rules are amply studied using methods and means of interactive simulation. A case study derived from industrial practice, using the database of a medium-sized manufacturing company is also included.

scholarly journals Vibration Management for Slope Stability with “Signature Hole Analysis” Method in Open Pit Blasting Activity

2019 ◽  
Vol 1 (1) ◽  
pp. 29-35
Author(s):  
Muhammad Syafiq Isnaya ◽  
Muhammad Fadil Bellico ◽  
Dwi Agung Priyanggoro
Keyword(s):  
Wave Propagation ◽  
Slope Stability ◽  
Ground Vibration ◽  
Open Pit ◽  
Analysis Method ◽  
Scaled Distance ◽  
The Stability ◽  
The Impact

One of the impact blasting activity is Ground Vibration which will affect the stability of the slope. Research and experiment conducted using Signature Hole Analysis (SHA) for monitoring wave propagation in each block-strip used to model and predict vibration which caused by the blasting activity. Signature Hole Analysis combined with Scaled Distance has succeeded in becoming the solution of ground vibration management.

scholarly journals EVALUASI GETARAN PELEDAKAN OVERBURDEN BERDASARKAN POWDER FACTOR PADA PT BINA SARANA SUKSES

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Yuliana Yuliana ◽  
Nurhakim Nurhakim ◽  
Riswan Riswan ◽  
Ferdinandus Ferdinandus ◽  
Kartini Kartini
Keyword(s):  
Particle Velocity ◽  
Ground Vibration ◽  
Peak Particle Velocity ◽  
Scaled Distance ◽  
Powder Factor

PT Bina Sarana Sukses merupakan perusahaan kontraktor tambang batubara yang bekerja melayani produksi batubara dan overburden untuk PT Antang Gunung Meratus. Salah satu kegiatan penambangan adalah pengupasan lapisan penutup dengan cara pemboran dan peledakan. Geometri peledakan yang digunakan di perusahaan yaitu burden 8 m x spasi 9 m dengan kedalaman lubang maksimal 9 m dengan arah pemboran vertikal dan pola  pemboran  staggered  pattern. Pada Pit Warute dilakukan peledakan dengan metode nonel, sedangkan pola peledakan yang digunakan echelon, boxcut dan v-cut. Letak Pit Warute dekat dengan office, sehingga isian bahan peledaknya dibatasi sesuai jarak tersebut agar getaran yang dihasilkan tidak mencapai 2 mm/s.Meteode yang digunakan dalam penelitian ini dengan menganalisa  faktor – faktor yang mempengarahui ground vibration, seperti : jarak pengukuran dari titik pengukuran, jumlah isian bahan peledak, dan kondisi alat. Adapun  analisa  hubungan antara Peak Particle Velocity terhadap Powder Factor yaitu, Setelah dikelompokkan dengan parameter isian bahan peledak per lubang yaitu 100 kg , dan scaled distance yang sama sebesar 60, parameter yang digunakan adalah peak particle velocity 1,51 mm/s dengan powder factor 0,16 kg/m3, peak particle velocity 2,26 mm/s dengan powder factor 0,18 kg/m3 dan peak particle velocity 3,43 mm/s dengan powder factor 0,23 kg/m3.Maka didapatkan hasil analisa yaitu semakin kecil powder factor, maka nilai peak particle velocitynya juga cenderung kecil. Sedangkan semakin besar nilai powder factor yang digunakan, maka nilai peak particle velocitynya juga cenderung semakin besar. Hal ini dikarenakan tiap geometri peledakan memiliki perbedaan kedalaman lubang ledak, jumlah lubang dan isian bahan peledak yang berbeda. Namun, ada 2 pengamatan yang nilai peak particle velocity melampaui batas yang ditetapkan perusahaan yaitu sebesar 2 mm/s yaitu pada nilai PPV 2,26 mm/s dan 3,43 mm/s. Dengan  powder factor  tidak boleh melebihi 0,17 kg/m3. Kata Kunci : Ground Vibration, Jarak, , Peak Particle Velocity, Peledakan, Powder Factor

Sign in / Sign up

Export Citation Format

Share Document