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Cut coal mine near the top of blasting and safety control


Step in the deep hole blasting vibration caused by blasting propagation, according to the formula. Wang Q ~ = R. 'Calculate the critical areas to ensure maximum security section of the surrounding buildings the amount of primary explosive. 3 vertical direction: Q a: R. ()%: R3 (surface 0.5) 1.98:9.6 × 1o sister s ・ 18 ・ Opencast Mining Technology from 2008; three turns j. . 1.87 horizontal radial direction: Q A = R () = R3 () 4 actual detonation with a safe maximum dose should be taken as the value of the minimum. According to the An Quanzhen houses and burst speed center distance, the maximum amount of a controlled detonation at 2816kg the following drugs do not cause damage to the houses. In order to ensure the lower part of the coal mining area mine safety and to avoid flying stone damage to the surrounding houses as well as damage to the Rolling Stones on the mine, the actual construction of the largest single explosive charge will be controlled at 900kg or less. 【Blasting parameters 3.2 (1) deep hole blasting parameters values in Table 1. Blasting parameters in Table 1 Table (2) Arrangement of Holes. Hole by way of gore. Each blast hole layout along the steps of the slope, the maximum number of a hole under the control of blasting required to determine the earthquake, the general control is appropriate in the 4 hole. (3) charging structure coupling charge, charge density 0.9kg/m3, charge length of the 6 ~ 17m, the length of the orifice plug 3.0 ~ 5.0m (based on the size of pitch and row spacing appropriate adjustments.) Hole increases with a detonator initiation initiation kits, kits for the 2 rounds of each detonator initiation. Body as close to the bottom of the hole initiation, 2 ~ 3m away from the hole at the bottom. 【8】 blasting 3.3 Initiating the network using detonator initiation systems. In order to reduce the maximum amount of a primary explosive, blasting vibration reduction of small coal mines and the destruction of surrounding buildings,ugg stiefel, the use of the hole, hole in the extension of millisecond blasting network. Hole with 6-9 paragraph detonator, with 4 holes outside the detonator. Using double-burst network, greatly enhancing the reliability of the network initiation. Initiation system millisecond interval, according to the size composition of any millisecond blasting initiation sections, in order to achieve large-scale blasting. 4 the maximum amount of a drug efficacy and safety of blasting a dose of 4.1 maximum blasting effect in order to guarantee the date specified in the contract to complete the mining Ores, quasi blasting, 4641TI platform to cut the top, decided to adopt a quasi one-time blast medication up to 47t big explosion,ugg botas, maximum charge capacity of 800,ugg boots sale, the total number of 482 made with a detonator, blasting a total l6 million m. Basically reached after blasting and little chunks,uggs ireland, blasting effect, leaving guns root. 4.2 Test results c10】 mine small coal mines nearby, and winch room at the main mine blasting vibration testing. A typical test waveform shown in Figure 1. The biggest shock waveform broken by the shock speed is 0.078cm / s. The shock speed is far / J Safety Regulations (GB6722 - 2003)) provided for the safety of a vessel to allow the standard 2cm / s, more than the Po Standard Roadway 5cm / s. So mine blast produced by cutting the top of the small mines had no influence. Figure 1 A typical repair burst test waveforms in Figure 5 Conclusion (1) through the more complex the environment under the conditions of test and analysis of explosive secret in order to determine a safe maximum dose to lack of breaking Parameters. This can not only improve the efficiency of production blasting schedule,ugg boots ireland, and can effectively control the security; (2) The differential hole, hole in the extension of the compound greatly enhanced explosive detonation initiation network, the reliability of the booster (3) blasting fragmentation and the foundation of the village into a large construction project. Through the appropriate hole distance decreases with increasing row spacing to effectively get energy and reduce the bulk rate; the same time, were 0.5 to 2 hole and the initiation of deep body from the bottom of the hole as far as possible be placed in women decreased 2 ~ 3m foundation. References: [1] Aaron. Blasting Theory and Technology [M]. Beijing: Metallurgical University Press, 2004. [2] Peng Leping. Open analysis of limestone mining exploration project planning techniques, (supplement), 2OO6. [3] Ding Enrong. In the deep hole blasting in the mine Ores should be broken in, 2002, (3). [4] Zhangjie Tao, Kin Chung, Peter, Demolition. Blasting rock near the particle vibration analysis [J]. Safety and Environment, 2003, (2) :36-39 [5] Zhou Guoxiang, Liu Kaiwen, Xu Dongming. Blast vibration monitoring and anti-break, 2001, (4) :75-77. [6] Wang Hailiang. Railway blasting EM]. Beijing: China Ministry of Railways, [7] Peng Leping. Deep open pit blasting to improve high level instance [2001, (1) :89-90. [8] Liu Dianzhong. Practical Handbook of industrial blasting [M]. Beijing Metallurgical Engineering in 1999. [102 Wuhan Institute of thick Bo security technology, standard safety regulations blasting China Standard Press, 2004.
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