Optimization And Application Of Parameters For Blasting With Deep Water In Deep Wells

The Bisikuduke open-pit coal mine?abbreviation:Bie mine?rock stripping project is affected by the water-rich surface of the platform,and suffering from dilemma.The optimization of parameters for deep-hole step-blasting with water rich in other mines starts from basic research.After analyzing the current status and problems of water-rich deep-hole step blasting,based on the existing construction conditions,construction technology,and mechanical equipment and other minerals of the mine,through engineering experience,The theoretical formula and engineering tests are combined,repeatedly verified and refined,and the objective law of water-deep hole step-blasting is mastered;the appropriate blasting parameters for water-rich step deep hole blasting are repeatedly modified by engineering test method,and the blasting effect and equipment are emphasized.Harmonic harmonization;Achieved the blasting effect of rich water deep hole bench blasting,high high-loading efficiency;At the same time taking into account the safety of blasting vibration;And the economic cost is reasonable.In the case of significant differences between water-rich deep-hole bench blasting and poor-water deep-hole bench blasting,the same blasting parameters are implemented on the+1240platform?water-rich?and the+1276 platform?water-poor?.There are significant differences in rich water stairs and general dry hole stairs in blasting.Using speed tester to measure the detonation velocity of emulsified explosives in water-hole-rich and open-air natural environments.It is clear that the need for optimization of blasting parameters in water-rich platform.The gravimetric method was used to measure the depth of water in boreholes of water-rich platforms,such as+1240,+1228,+1216,and+1204,combining with geotechnical survey data to provide basic information for optimization of blasting parameters.Trying out hole spacing 7m*4m,7m*3.5m,6.5m*.3.5m,and 6.5m*3.5m in water-rich platform+1240,+1204,+1204,and+1228platforms;when the row spacing is 6.5m*3.5m blasting effect is best.For deep-hole blasting with water-rich steps,propose the ultra-deep:h=hs+?1-k?Ls;implementing ultra-deep 1m,1.5m,2m,2m,2m at platforms+1240,+1228,+1228,+1204;When h=2m,the roots will be flush after digging.Filling length of water-rich platform:L=L₁+L₂;L₁ is the current empirical tamping length,L₂ is the complement tamping length,and the tamping length is determined to be 3m;it is applied on the platforms of+1216,+1228,and+1240 and excellent blasting effect is achieved.In the+1192 platform,the front vertical resistance line“w”was tested to be 2.8m and 2.5m;in the+1228,the front vertical resistance line was tested:w=2m;when the w=2m,the blasting block size is most suitable for the equipment.optimized;blasting parameters are applied on platforms+1216 and+1228?Recording the number of transport vehicles in the loading work area by means of the vehicle counter,N;use the indirect method to calculate the efficiency of excavator mining,?;Combining the physical size parameters of existing excavator buckets in the site to define large blocks of blasting,and propose statistics method of the block rate,f.Rocks that need to be crushed by a breaker or treated by a second shot are defined as extra large rocks M,and a double class duration is used as the statistical period.The technician collects the number of extra large blocks that appear during the excavation process.Using the S86T GPS-RTK to accurately position of the hole,useing the CASS7.0 to draw for the hole position information.Using CASS2008forAutoCAD to complete the design of blasting rockmass and actual excavation of rockmass,then calculate the blasting unit consumption q,and the blasting rate,?.With the use of DJ drones to post-explore and post-explode rock masses.Using Split-Desktop3.0 blasting block analysis software to analyze the distribution size of the rock fragments after blasting,and combining the physical dimensions of the excavator's bucket capacity to explore the matching degree between the mining equipment and the blasting block degree.Using Blasting Vibrometer TC 4850N to measure blasting vibrations and harm to the infrastructure around the pit.The main requirements for blasting construction are put forward.Mastered the reasonable blasting parameters under the conditions of water rich,fine sandstones,deep holes in stairs,120mm hole diameter,and detonation velocity 4100⁴400 m/s:a*b:6.5m*3.5m;w:3m;ultra-deep2m;L:3m;number of blasthole rows n:4 rows;50ms delay blasting network between rows.The optimized blasting parameters for the+1216 and+1228 platforms;not only the blasting effect is good,but the blasting block is harmonized with the mining equipment.It does not constitute a vibration hazard to the infrastructure facilities around the pit.The first data is analyzed as follows;+1216 platform:?=7.9;f=2.7%;M=12;q=0.48kg/m3;Split-Desktop?<100cm?,92.7%;Blasting vibration,3.5 cm/s?<3.5⁴.5 cm/s?;+1228 platform:?=8;f=2.5%;M=11;q=0.48kg/m3;Split-Desktop?<100cm?,92.7%;Blasting vibration,2.9 cm/s?<3.5⁴.5 cm/s?.