Evaluation of ground vibration effect of blasting operations in a magnesite mine

2009 ◽  
Vol 29 (4) ◽  
pp. 669-676 ◽  
Author(s):  
Hakan Ak ◽  
Melih Iphar ◽  
Mahmut Yavuz ◽  
Adnan Konuk
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Huayuan Ma ◽  
Mingshou Zhong ◽  
Xinghua Li ◽  
Quanmin Xie ◽  
You Zhou ◽  
...  

In this paper, the explosion experiment of the OD1422-X80 natural gas pipeline was carried out. The phenomenon of pipeline explosion was recorded, and a large amount of data on vibration effects were obtained. The data showed that the ground vibration during the explosion was mainly caused by the physical explosion process, and the subsequent gas explosion did not produce strong vibration. Based on the ANSYS/LS-DYNA platform, a numerical calculation model of this experiment was established. The numerical results agreed well with the experimental results. Simulation and experimental results showed that when the gas pressure in the pipe was lower than 7 MPa, the pipeline cracks stop growing. The maximum speed of the pipe wall moving outward reached 50 m/s, which formed a huge impact compression effect on the surrounding soil. This state spread to distant places and gradually decayed into an elastic stress wave, which formed a ground vibration effect. Time-frequency analysis was introduced into the vibration signal processing. The analysis results showed that the main frequency of pipeline explosion vibration was distributed around 10 Hz and had a long duration. The research results provided a reference for subsequent gas pipeline explosion test and numerical simulation research.


2012 ◽  
Vol 457-458 ◽  
pp. 325-329
Author(s):  
Luo Yi ◽  
Sen Wei Xia

It’s common to see the dispute caused by pile driving construction vibration effect, which has become a concern of social problems. The paper analyzes the mechanism and law of ground vibration caused by the pile driving construction. Combined with the engineering practice, discussion about the defects in the criteria of vibration detection is presented. It is necessary to do assessment study on impact of pile driving vibration on surrounding houses. Project practice indicates that application of assessment study on impact of pile driving vibration on surrounding houses is an effective management.


2018 ◽  
Vol 37 (4) ◽  
pp. 881-895 ◽  
Author(s):  
Jingjing Hu ◽  
Yi Luo ◽  
Zaitian Ke ◽  
Penghui Liu ◽  
Jiayun Xu

Studies on ground vibration induced by railway operation usually focused on wagons running on ground or abutments, while vibration from a railway viaduct is often assumed to be much lower. Based on field test in the vicinity of a heavy freight railway viaduct above Shenshan Village, China, the attenuation of ground vibration induced by heavy freight wagons for coal transportation is studied. And evaluation is conducted on an adjacent house to access vibration disturbance to residents near a viaduct. Propagation and attenuation of vibration induced from viaduct are studied by analyzing peak particle velocity and spectra of ground and house vibration in the vicinity of the viaduct. Vibration signals were collected for 34 trains with different train speed and wagon weight. In all monitored situations, vertical vibration is generally larger than horizontal vibration. The relationship between distance to pier and PPV is revealed by a power function modified from Sadovskii formula with high correlation factor. Analysis also indicates a much lower dominant frequency induced by low-speed trains with or without acceleration than normal speed trains. A dramatic amplitude reduction is shown within frequency between 25 Hz and 35 Hz when train speed is reduced. Empty wagons also show smaller amplitude in most frequency bands, with significant difference in 15–25 Hz. Analysis on the house also shows larger vibration in vertical than horizontal, and vibration amplitude in some frequency bands has exceeded relative criteria. Analysis result shows significant ground and house vibration effect form a viaduct, and piers should be considered as vibration sources for ground and houses in future studies.


2011 ◽  
Vol 255-260 ◽  
pp. 3145-3149
Author(s):  
Zong Ling Yan ◽  
Hai Ping Li

Multiple Head Breaker (MHB) is an innovative cement concrete pavement breaking machine with high impact energy. The impact energy of multiple head propagates in vertical and horizontal direction simultaneously which results the environmental vibration effect consequently. The slope and structures beside the highway are influenced by vibration in rubblizing of cement concrete pavement. But there is a lack of research on environmental vibration effect, such as the influence range, whether there exists destructive effect or not. The characteristics and influence range of ground vibration are analyzed on the base of vibration data acquired by seismograph. The vibration attenuates fast and takes on some traits of concussion and instantaneous vibration. The safe influence range of MHB is associated with characteristic of slope soil. Relationship between vibrancy distance and vertical & horizontal vibration acceleration is established. And the influence range and safe distance are put forward which can provide reasonable parameters for design and construction in rehabilitation of cement concrete pavement.


2020 ◽  
Vol 1 (1) ◽  
pp. 317-326
Author(s):  
Sutami Sitorus ◽  
Elfizar Diando

ABSTRAK Pit C2, merupakan salah satu blok penambangan Site Sambarata Mine Operation yaitu masuk ke dalam blok B1. Merupakan pit aktif hingga sekarang dimana penambangan dari 2018 hingga akhir 2019 telah mengarah ke pemukiman hingga boundary pit (2019) berjarak 200 m ke pemukiman terdekat dan area tersebut penambangan menggunakan peledakan.Volume overburden pada area tersebut yang termasuk zona dibawah 500 m jarak aman peledakan adalah 1.340.281 bcm dan coal sebesar 175.237 ton dengan SR 7,65. Telah diterapkan beberapa taknik peledakan pada area tersebut ,yaitu salah satunya dengan sistem peledakan elektronik detonator dengan berbagai improvmentnya diantaranya : pola segementasi, segmentasi bufferzone, electronic detonator with air decking dan penggunaan matrial stemming full gravel. Kendala yang timbul adalah masalah efek peledakan yaitu vibrasi dan fly rock dengan jarak tersebut serta pembentukan bench height yang tidak maksimal karena adanya limit kedalaman lubang maksimal 5 m di area 500-300 m dari pemukiman, sehingga produktivity unit (PC 2000) tidak maksimal dan menimbulkan blasting cost yang tinggi. Penggunaan Explosives Low Density (0,7-0,8 gr/cc), di area < 500 m dari pemukiman bisa menambah kedalaman lubang bor hingga kedalaman 7 m, sehingga menambah volume peledakan tanpa mengubah parameter peledakan sebelumnya yaitu : pattern peledakan, charging weight dan penggunaan sistem elektronik detonator dan juga bisa menggunakan sistem peledakan nonel. Dengan explosive low density pengingkatan column raise lubang ledak menjadi 1,3 m. Dari data digging time unit loader (PC 2000), mampu mencapai 9,9 detik dari target maksimal 11 detik, produktivity di atas 700 bcm/jam dan vibration effect yang dihasilkan masih di bawah 2,2 mm/sec (PVS) yang menjadi patokan site. Sehingga penggunaan explosive low explosive ini bisa mempercepat sekuen penambangan di pit C2 sesuai dengan boundary disain 2019 Kata kunci : Low density,Ground vibration, fly rock , productivity  ABSTRACT Pit C2, is one of the Mining Samntbarata Mine Operation mining blocks, which is included in Block B1. It is an active pit up to now where mining from 2018 to the end of 2019 has led to settlements to the boundary pit (2019) within 200 m to the nearest settlement and the area is mining using blasting. Overburden volume in the area which includes zones below 500 m safe blasting distance is 1,340,281 bcm and coal of 175,237 tons with SR of 7.65. Several blasting techniques have been applied in this area, one of which is an electronic detonator blasting system with various improvements including: Segmentation pattern, buffer zone segmentation, electronic detonator with air decking and the use of full gravel matrial stemming. The obstacle that arises is the problem of blasting effects namely vibration and fly rock with that distance and the formation of bench height that is not optimal because of the maximum hole depth of 5 m in the area of 500-300 m from the settlement, so the productivity unit (PC 2000) is not optimal and causes high blasting cost. The use of Explosives Low Density (0.7-0.8 gr / cc), in the <500 m area of the settlement can increase the depth of the drill hole to a depth of 7 m, thus increasing the volume of blasting without changing the previous blasting parameters namely: blasting pattern, charging weight and the use of an electronic detonator system and can also use a nonel blasting system. With explosive low density the column raising the explosive hole to 1.3 m. From the digging time unit loader data (PC 2000), it can reach 9.9 seconds from the maximum target of 11 seconds, productivity above 700 bcm / hour and the resulting vibration effect is still below 2.2 mm / sec (PVS) which is the benchmark site . So that the use of low explosive explosives can accelerate the mining sequence in pit C2 in accordance with the 2019 design boundary. Kata kunci : Low density,Ground vibration, fly rock , productivity


2016 ◽  
Vol 47 (6) ◽  
pp. 649-663
Author(s):  
Regina Vladimirovna Leonteva ◽  
Vsevolod Igorevich Smyslov

2019 ◽  
Vol 18 (4) ◽  
pp. 817-824
Author(s):  
Edward Gheorghiosu ◽  
Attila Kovacs ◽  
Gabriel Dragos Vasilescu ◽  
Daniela Carmen Rus ◽  
Florin Radoi
Keyword(s):  

1996 ◽  
Vol 118 (3) ◽  
pp. 482-488 ◽  
Author(s):  
Sergio Bittanti ◽  
Fabrizio Lorito ◽  
Silvia Strada

In this paper, Linear Quadratic (LQ) optimal control concepts are applied for the active control of vibrations in helicopters. The study is based on an identified dynamic model of the rotor. The vibration effect is captured by suitably augmenting the state vector of the rotor model. Then, Kalman filtering concepts can be used to obtain a real-time estimate of the vibration, which is then fed back to form a suitable compensation signal. This design rationale is derived here starting from a rigorous problem position in an optimal control context. Among other things, this calls for a suitable definition of the performance index, of nonstandard type. The application of these ideas to a test helicopter, by means of computer simulations, shows good performances both in terms of disturbance rejection effectiveness and control effort limitation. The performance of the obtained controller is compared with the one achievable by the so called Higher Harmonic Control (HHC) approach, well known within the helicopter community.


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