scholarly journals ANALISA LINEAR SUPERPOSITION DALAM KELOLA GETARAN TANAH HASIL PELEDAKAN PADA PERTAMBANGAN BATUBARA

2020 ◽  
Vol 1 (1) ◽  
pp. 349-356
Author(s):  
Dhion Pradatama. DM ◽  
Chani Pradasara ◽  
Syarif Nurdiansyah
Keyword(s):  
Wave Propagation ◽  
Delay Time ◽  
Ground Vibration ◽  
Analysis Method ◽  
Linear Superposition ◽  
Service Company ◽  
Engineering Approach ◽  
Vibration Signature ◽  
Waste Energy ◽  
Principle Of Linear Superposition

ABSTRAK Getaran tanah merupakan getaran yang ditimbulkan akibat dari proses peledakan tambang. Selama ini getaran tanah dianggap sebagai waste energy yang dapat merusak dan menjadi isu terhadap lingkungan di sekitar area tambang. PT. Multi Nitrotama Kimia sebagai perusahaan jasa peledakan dan penjualan bahan peledak di Indonesia memiliki kustomer dengan isu demikian, salah satunya adalah PT Adaro Indonesia. Guna menanggulangi isu tersebut, maka dilakukan rekayasa teknik terhadap getaran tanah yang dihasilkan dengan merubah waste energy menjadi work energy dengan prinsip linear superposition menggunakan metode signature hole analysis (SHA) dan dioptimalkan dengan aplikasi inter-deck delay pada lubang double-deck untuk meminimalisir getaran tanah yang ditimbulkan. Penelitian dan percobaan dilakukan menggunakan metode Signature Hole Analisys (SHA) untuk merekam perambatan gelombang di setiap range blok – strip tertentu terhadap area konsen. Gelombang yang telah terekam selanjutnya dianalisis dengan fitur Linear Superposition untuk mendapatkan rekomendasi waktu tunda beserta prediksi getaran yang ditimbulkan. Rekomendasi waktu tunda yang didapat adalah waktu tunda pada inter-hole, inter-row, dan inter-deck yang mana akan diterapkan untuk peledakan selanjutnya. Berdasarkan analisis menggunakan metode Signature Hole Analysis, rekomendasi waktu tunda yang diberikan dapat diterapkan untuk mengakomodir prinsip linear superposition gelombang. Penerapannya dapat dioptimalkan menggunakan inter-deck delay sehingga meminimalisir getaran tanah yang dihasilkan. Dibuktikan oleh getaran tanah yang dihasilkan menggunakan rekomendasi tersebut selalu di bawah standar yang ditetapkan (PVS = < 2.00 mm/s). Kaca Kunci : Getaran Tanah, Signature Hole Analysis, Linear Superposition   ABSTRACT One of the blasting process effect is ground vibration. Ground vibration currently consider as waste energy which it can infere and be an issue to the environment. PT. Multi Nitrotama Kimia as blasting service company and explosives sales in Indonesia has customers dealing with that issues, one of them is PT Adaro Indonesia. To overcome the issue, engineering approach is done to the ground vibration by changing waste energy into work energy with the principle of linear superposition using the signature hole analysis (SHA) method and optimized with the application of inter-deck delay on the double-deck hole to minimize the ground vibration. Researches and experiments are carried out using the Signature Hole Analysis (SHA) method to record wave propagation in each range of certain blocks - strips to the concern area. The recorded waves are analyzed with the Linear Superposition feature to obtain delay time recommendation along with the predicted vibration. The recommended delay time obtained is the delay time on inter-hole, inter-row, and inter-deck which will be applied for next blasting. Based on the Signature Hole Analysis method, the recommended delay time given can be applied to accommodate the linear superposition wave principle. Its application can be optimized using inter-deck delay to minimize ground vibration produced. Its proven by ground vibrations produced using the recommendations always below the specified standard (PVS = <2.00 mm / s). Keywords: Ground Vibration, Signature Hole Analysis, Linear Superposition

scholarly journals Linier Superposition Analysis on Managing Blasting Ground Vibration in Coal Mining

2019 ◽  
Vol 1 (1) ◽  
pp. 22-28
Author(s):  
Dhion Pradatama ◽  
Chani Pradasara ◽  
Syarif Nurdiansyah
Keyword(s):  
Wave Propagation ◽  
Coal Mining ◽  
Delay Time ◽  
Ground Vibration ◽  
Analysis Method ◽  
Ground Vibrations ◽  
Linear Superposition ◽  
Engineering Approach ◽  
Waste Energy ◽  
Principle Of Linear Superposition

One of the blasting process effect is ground vibration. Ground vibration currently consider as waste energy which it can infere and be an issue to the environment. PT. Multi Nitrotama Kimia as blasting service and explosives sales in Indonesia has customers dealing with that issues, one of them is PT Adaro Indonesia. To overcome the issue, engineering approach is done to the ground vibration by changing waste energy into work energy with the principle of linear superposition using the signature hole analysis (SHA) method to minimize the ground vibration. Researches and experiments are carried out using the Signature Hole Analysis (SHA) method to record wave propagation in each range of certain blocks - strips to the concern area. The recorded waves are analyzed with the Linear Superposition feature to obtain delay time recommendation along with the predicted vibration. The recommended delay time obtained is the delay time on inter-hole and inter-row which will be applied for next blasting.Based on the Signature Hole Analysis method, the recommended delay time given can be applied to accommodate the linear superposition wave principle. Its application can be optimized using inter-deck delay to minimize ground vibration produced. Its proven by ground vibrations produced using the recommendations always below the specified standard (PVS = &#60;2.00 mm / s).

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 MANAJEMEN GETARAN UNTUK KESETABILAN LERENG DENGAN METODE “SIGNATURE HOLE ANALISYS” DALAM KEGIATAN PELEDAKAN TAMBANG TERBUKA

2020 ◽  
Vol 1 (1) ◽  
pp. 357-364
Author(s):  
Muhammad Syafiq Isnaya ◽  
Fadhil Bellico ◽  
Dwi Agung Priyanggoro
Keyword(s):  
Wave Propagation ◽  
Particle Acceleration ◽  
Slope Stability ◽  
Ground Vibration ◽  
Analysis Method ◽  
Scaled Distance ◽  
The Stability ◽  
The Impact ◽  
Slope Design ◽  
Maximum Limit

ABSTRAK Pit 10 merupakan wilayah operasional PT. Alamjaya Bara Pratama dalam kegiatan peledakan bekerjasama dengan PT. Multi Nitrotama Kimia sebagai penyedia bahan peledak dan jasa peledakan. Salah satu dampak yang ditimbulkan dari kegiatan peledakan adalah Ground Vibration yang akan mempengaruhi kestabilan lereng pada area pit 10. Desain akhir lereng pada pit 10 menunjukan batas maksimal Peak Particle Acceleration (amax)  yang dapat diterima lereng akibat hasil peledakan sebesar 0,07g, sehingga perlu adanya manajemen getaran agar getaran yang dihasilkan oleh kegiatan peledakan tidak mempengaruhi kestabilan lereng di area Pit 10. Penelitian dan percobaan dilakukan menggunakan metode Signature Hole Analysis (SHA) untuk pemetaan terhadap perambatan gelombang di setiap range blok – strip tertentu untuk kemudian digunakan untuk memodelkan dan memprediksi getaran yang diakibatkan oleh kegiatan peledakan pada setiap blok – strip. Metode Signature Hole Analysis yang dikombinasikan dengan pendekatan Scaled Distance, berhasil menjadi solusi dalam tata kelola getaran peledakan di Pit 10. Hasilnya, sepanjang tahun 2019 berjalan, tidak ada isu berkenaan dengan bagian geoteknik dari lereng-lereng di seputaran area operasional Pit 10. Pendekatan Signature Hole Analysis dan kontrol bersama tim Geoteknik menghasilkan kerjasama yang baik serta tata kelola kestabilan lereng menjadi lebih aman. Kaca Kunci : Kestabilan Lereng, Peledakan, Signature Hole Analysis  ABSTRACT Pit 10 is operational area of PT. Alamjaya Bara Pratama  the blasting activity carried out with PT. Multi Nitrotama Kimia as provider of explosive and blasting service. One of the impact blasting activity is Ground Vibration which will affect the stability of the slope in the area pit 10. The final slope design in pit 10 shows the maximum limit of peak particle acceleration (amax) that can’t be exceed by 0,07g. its very necessary to manage the ground vibration so the vibration produced by blasting activity do not affect the stability of the slope in pit 10. 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 in pit 10. Throughout 2019 there was no problem with geotechnical issues of slopes around the pit 10. Signature Hole Analysis Method and Geotechnical approachment result good impact of a slope stability on pit 

A time discontinuous Galerkin isogeometric analysis method for non-Fourier thermal wave propagation problem

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yang Xia ◽  
Pan Guo
Keyword(s):  
Wave Propagation ◽  
Discontinuous Galerkin ◽  
Heat Wave ◽  
Isogeometric Analysis ◽  
Numerical Instability ◽  
Analysis Method ◽  
Content Type ◽  
Mesh Dependency ◽  
Spurious Oscillations ◽  
Stability And Accuracy

Purpose Numerical instability such as spurious oscillation is an important problem in the simulation of heat wave propagation. The purpose of this study is to propose a time discontinuous Galerkin isogeometric analysis method to reduce numerical instability of heat wave propagation in the medium subjected to heat sources, particularly heat impulse. Design/methodology/approach The essential vectors of temperature and the temporal gradients are assumed to be discontinuous and interpolated individually in the discretized time domain. The isogeometric analysis method is applied to use its property of smooth description of the geometry and to eliminate the mesh-dependency. An artificial damping scheme with proportional stiffness matrix is brought into the final discretized form to reduce the numerical spurious oscillations. Findings The numerical spurious oscillations in the simulation of heat wave propagation are effectively eliminated. The smooth description of geometry with spline functions solves the mesh-dependency problem and improves the numerical precision. Originality/value The time discontinuous Galerkin method is applied within the isogeometric analysis framework. The proposed method is effective in the simulation of the wave propagation problems subjecting to impulse load with numerical stability and accuracy.

On the nature of the microwave field emerging from a composite pupil

2020 ◽  
Vol 34 (24) ◽  
pp. 2050247
Author(s):  
Ilaria Cacciari ◽  
Daniela Mugnai ◽  
Anedio Ranfagni
Keyword(s):  
Wave Propagation ◽  
Stochastic Model ◽  
Radio Frequency ◽  
Delay Time ◽  
Microwave Field ◽  
Near Field ◽  
Phase Variation ◽  
Experimental Investigations ◽  
Frequency Signal ◽  
Made In

Further experimental investigations in the microwave field emerging from a composite pupil are reported in order to determine the nature of the wave propagation. The experiments consisted of delay-time measurements as a function of the distance of the detector from the pupil under test, as well as of the phase variation of a radio-frequency signal at 35 MHz that modulated the same microwave carrier at 9.33 GHz. In addition, measurements employing an admittance comparator were made in order to determine the character of the propagation impedance. All results obtained confirmed superluminal behavior in the near field, up to a distance of about 40 cm. These results were then interpreted within the framework of a stochastic model.

Research on the Vibration Attenuation Rules and Wave Propagation Law under Impacting Drill on the Deep Soil Layer

2011 ◽  
Vol 250-253 ◽  
pp. 1971-1977
Author(s):  
Bo Zhang ◽  
Lian Jin Tao ◽  
Wen Pei Wang ◽  
Ji Dong Li
Keyword(s):  
Wave Propagation ◽  
Soil Layer ◽  
Ground Surface ◽  
Ground Vibration ◽  
Vibration Source ◽  
Vertical Acceleration ◽  
Deep Soil ◽  
Deep Soil Layer ◽  
Propagation Law ◽  
Vibration Attenuation

A field test is carried out to study the effect of vibration while treating foundation using vibroflotation method in the deep soil layer in Zhengzhou, China. The vibration attenuation rules and wave propagation rules in different formations caused by different numbers of drills are analyzed. Evaluate the influence on the adjacent buildings. The result shows that the vibration will be generated in foundation obviously in the process of construction using the method. Vibration force, impact frequency and site soil are important influence factors on ground vibration attenuation. The analysis reveals that the maximum vertical acceleration attenuation velocity was much greater in near area than that in the relative far area. The waves caused by vibration propagate in two ways: (1) surface wave is generated on the wall of drill hole and propagated to the ground surface, and attenuated in a certain distance (<8m); (2) shear wave was generated and propagated in the impacting formation and attenuated from the deep formation to the ground surface. Vibration amplitude is mainly distributed in the low frequency range in the areas which far away from vibration source and in the silt layer near the ground surface.

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