Study on the effect of air deck on ground vibration and development of blast damage zone using 3D discrete element numerical method

The rock load acting on the lining of an underground excavation is influenced by multiple factors, including rock type, rock mass condition, depth, and construction method. This study focuses on quantifying the magnitude and distribution of the radial loads on the lining of a deep shaft constructed in hard rock by the so-called short-step method. The blasting-induced damage zone (BDZ) around the shaft was characterized using ultrasonic testing and incorporated into the convergence-confinement method (CCM) and 3D numerical analyses to assess the impact of BDZ on rock loading against the liner. The results show that excavation blasting of shafts is an important controlling factor for the degradation of the rock mass, while the orientation and magnitude of the principal stress had a minimal influence on the distribution of blast-induced damage. The analysis shows that increasing the depth of blast damage in the walls can increase the loads acting on the lining, and the shear loads acting on the liner could be significant for shafts sunk by the short-step method in an area with anisotropic in situ stresses.

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A 3D synthetic rock mass numerical method for characterizations of rock mass and excavation damage zone near tunnels

Bulletin of Engineering Geology and the Environment ◽

10.1007/s10064-020-01898-5 ◽

2020 ◽

Vol 79 (10) ◽

pp. 5615-5629

Author(s):

Yabing Zhang ◽

Xinrui Liu ◽

Tianhong Yang ◽

Peng Jia ◽

Xin Liu ◽

...

Keyword(s):

Rock Mass ◽

Numerical Method ◽

Damage Zone ◽

Excavation Damage Zone ◽

Synthetic Rock Mass ◽

Synthetic Rock ◽

Excavation Damage

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Ellipse Particle Modeling for Fresh Concrete and Dynamic Simulation of Slump Test

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.168-170.746 ◽

2010 ◽

Vol 168-170 ◽

pp. 746-750

Author(s):

Quan Yuan ◽

Zhan Qi Guo

Keyword(s):

Discrete Element Method ◽

Numerical Method ◽

Dynamic Simulation ◽

Experimental Research ◽

Fresh Concrete ◽

Discrete Element ◽

Qualitative Simulation ◽

Slump Test ◽

Particle Modeling ◽

Element Method

The Discrete Element Method(DEM) has become a powerful numerical method for analysing discontinuous media. This paper provides a new ellipse particle modeling of fresh concrete by DEM. So far, research has been limited to experimental research and qualitative simulation. In this research, the parameters are defined from rheology. Then, a quantitative simulation is proposed. Slumping behaviors of fresh concrete are simulated.

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ANALISIS GROUND VIBRATION PADA PEMBONGKARAN OVERBURDEN TERHADAP PERMUKIMAN PENDUDUK DI PIT PARINGIN PT BUKIT MAKMUR MANDIRI UTAMA JOBSITE PT ADARO INDONESIA

Jurnal GEOSAPTA ◽

10.20527/jg.v4i2.5163 ◽

2018 ◽

Vol 4 (2) ◽

Author(s):

Ahmad Zaidan ◽

Nurhakim Nurhakim ◽

Riswan Riswan ◽

Mayati Isabella

Keyword(s):

Particle Velocity ◽

Ground Vibration ◽

Peak Particle Velocity ◽

Scaled Distance ◽

M 10 ◽

Air Deck

Kegiatan peledakan yang dilakukan oleh PT Bukit Makmur Mandiri utama (BUMA) memegang peranan penting dalam kemajuan produksi tambang pada Pit Paringin, namun Pit Paringin memiliki jarak yang dekat dengan daerah kritis (permukiman penduduk) sehingga harus melakukan kontrol terhadap isian bahan peledak agar tingkat ground vibration yang dihasilkan tidak terlalu besar sesuai batas tingkat ground vibration yang ditetapkan PT Adaro Indonesia di daerah kritis yang tidak boleh lebih dari sama dengan 2 mm/s.Metode analisis yang digunakan adalah dengan menganalisis faktor-faktor yang mempengaruhi tingkat ground vibration dan melakukan analisis scaled distance melalui software Blastware 10 untuk mendapatkan rumus scaled distance yang akan digunakan untuk memprediksi isian bahan peledak maksimal per lubang dengan variasi jarak aman agar tingkat ground vibration tidak melebihi batas maksimal ketetapan yaitu 1.99 mm/s.Faktor-faktor yang mempengaruhi tingkat ground vibration yaitu jarak pengukuran, isian bahan peledak, metode decking, pola peledakan, diameter lubang ledak, burden dan spasi, serta elevasi lokasi peledakan. Hasil prediksi isian bahan peledak maksimal per lubang lokasi Low Wall metode Double Deck geometri 7 m x 8 m jarak terdekat 800 m terhadap permukiman penduduk yaitu sebesar 25 kg dan jarak terjauh 1130 m terhadap permukiman penduduk yaitu sebesar 49 kg, lokasi High Wall metode Single Deck geometri 8 m x 9 m, 9 m x 10 m, 10 m x 11,5 m jarak terdekat 800 m yaitu sebesar 46 kg, geometri 8 m x 9 m jarak terjauh 1120 m yaitu sebesar 90 kg, geometri 9 m x 10 m jarak terjauh 1210 m yaitu 104 kg, geometri 10 m x 11,5 m jarak terjauh 1150 m yaitu sebesar 94 kg, serta lokasi untuk High Wall metode Air Deck geometri 8 m x 9 m, 9 m x 10 m, 10 m x 11,5 m jarak terdekat 800 m yaitu sebesar 46 kg, geometri 8 m x 9 m jarak terjauh 1180 m yaitu sebesar 99 kg, geometri 9 m x 10 m jarak terjauh 1210 m yaitu sebesar 104 kg, geometri 10 m x 11,5 m jarak terjauh 1230 m yaitu sebesar 108 kg dengan nilai koreksi untuk prediksi isian bahan peledak lokasi Low Wall sebesar + 5 kg dan lokasi High Wall sebesar + 4 kg. Kata Kunci : Air Deck, Blasting, Ground Vibration, Peak Particle Velocity, Scaled Distance

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Numerical method for constructing a continual deformation model equivalent to a specified discrete element model

Physical Mesomechanics ◽

10.1134/s1029959913020069 ◽

2013 ◽

Vol 16 (2) ◽

pp. 152-161 ◽

Cited By ~ 3

Author(s):

A. F. Revuzhenko ◽

S. V. Klishin

Keyword(s):

Numerical Method ◽

Element Model ◽

Discrete Element ◽

Discrete Element Model ◽

Deformation Model

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Hybrid Finite-Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Advances in Civil Engineering ◽

10.1155/2020/7153958 ◽

2020 ◽

Vol 2020 ◽

pp. 1-27

Author(s):

Huaming An ◽

Hongyuan Liu ◽

Haoyu Han

Keyword(s):

Discrete Element Method ◽

Rock Fracture ◽

Failure Process ◽

Damage Zone ◽

Strong Shock ◽

Discrete Element ◽

Deep Tunnel ◽

Zone Formation ◽

Damaged Zone ◽

Element Method

A brief literature review of numerical studies on excavation damage zone (EDZ) is conducted to compare the main numerical methods on EDZ studies. A hybrid finite-discrete element method is then proposed to model the EDZ induced by blasts. During the excavation by blasts, the rock mass around the borehole is subjected to dynamic loads, i.e., strong shock waves crushing the adjacent rocks and high-pressure gas expanding cracks. Therefore, the hybrid finite-discrete element method takes into account the transition of the rock from continuum to discontinuum through fracture and fragmentation, the detonation-induced gas expansion and flow through the fractured rock, and the dependence of the rock fracture dynamic behaviour on the loading rates. After that, the hybrid finite-discrete element method is calibrated by modelling the rock failure process in the uniaxial compression strength (UCS) test and Brazilian tensile strength (BTS) test. Finally, the hybrid finite-discrete element method is used to model the excavation process in a deep tunnel. The hybrid finite-discrete element method successfully modelled the stress propagation and the fracture initiation and propagation induced by blasts. The main components of the EDZ are obtained and show good agreements with those well documented in the literature. The influences of the initial gas pressure, in situ stress, and spacing between boreholes are discussed. It is concluded that the hybrid finite-discrete element method is a valuable numerical tool for studying the EDZ induced by blasts in deep tunnels.

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