黄永辉, 李永杰, 杨阳, 熊卫国, 张智宇. 露天爆破中炸药单耗对岩石破碎块度的影响研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.09.11.003
引用本文: 黄永辉, 李永杰, 杨阳, 熊卫国, 张智宇. 露天爆破中炸药单耗对岩石破碎块度的影响研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.09.11.003
Study on the effect of explosive powder factor on rock crushing block size in open pit blasting[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.11.003
Citation: Study on the effect of explosive powder factor on rock crushing block size in open pit blasting[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.11.003

露天爆破中炸药单耗对岩石破碎块度的影响研究

Study on the effect of explosive powder factor on rock crushing block size in open pit blasting

  • 摘要: 露天爆破中岩石破碎块度是钻爆、铲装、运输及后续工艺等综合成本的主要衡量标准,炸药单耗是其主要影响因素,一般采用爆破模型试验开展相关研究,存在成本高、试验结果误差大等缺点。为了优化炸药单耗来降低爆堆的大块率、平均块度和预测实际工程块度,在爆炸破岩基础理论基础上,运用基础力学测试设备对模型材料进行了单轴抗压、弹性模量、断裂韧度等测试,标定RHT本构模型参数,运用数值仿真软件LS-DYNA和SPH粒子流算法构建了三维露天台阶爆破数值仿真模型,首次对爆破破岩数值模拟结果实现块度精准统计,并对爆破破岩块度随炸药单耗的变化规律开展了系统研究。研究结果表明:单耗0.23~0.55 kg·m-3,块度最大尺寸在240 mm、220 mm、180 mm、140 mm四个梯级分布明显;单耗大于0.55 kg·m-3,平均块度尺寸在60-80 mm间波动,尺寸变化减缓;G-G-S函数拟合块度分布通过率,相关系数均在0.9以上,验证了采用粒子流(SPH)的方法计算统计岩石破碎块度具有可行性;均匀性指数n在一定范围内波动,总体递减,分形维数D的变化规律与均匀性指数n相反。研究结果对爆破破碎块度分布规律的完善及爆破块度控制工程具有一定的意义。

     

    Abstract: The degree of crushing blocks during the open -air blasting is the main measurement standard for comprehensive costs such as drilling, shovel, transportation, and follow -up process. The single consumption of explosive is the main influencing factor. Generally, the blasting model test is used to conduct related research. There are some disadvantages such as high cost and large error of test results. Based on the basic theory of explosion rock breaking rock, the use of basic mechanical testing equipment for modeling materials for single-axis compression, elastic modulus, fracture toughness and other tests, calibrate RHT's model parameters, use numerical simulation software LS-Dyna and SPH The particle flow algorithm builds a three -dimensional open -roof blasting numerical simulation model. For the first time, the numerical simulation results of blasting block are accurately counted, and the law of the change of blasting block with explosive consumption is systematically studied. The results show that the maximum size and average size of rock blocks are affected by the amount of explosive used. The single consumption is greater than 0.23 kg·m-3, the maximum size of rock blocks is less than 240 mm, and the single consumption is between 0.31 and 0.39 kg·m-3 and between 0.55 and 0.71 kg·m-3, and the maximum size of rock blocks decreases rapidly. The maximum size of 240 mm, 220 mm, 180 mm, and 140 mm is obviously distributed; the degree of blocks of different single consumption is obviously different, and the average size of the single consumption of 0.23 ~ 0.55 kg·m-3 is reduced rapidly, and the single consumption is greater than 0.55 kg·m-3. Explosive diameter is greater than 24 mm, the average size of the rock block fluctuates between 60-80 mm, and the average block size changes slowly. The G-G-S function passes the distribution rate of block degree distribution, and the correlation coefficients are above 0.9. High correlation verification The method of calculating the use of particle flow (SPH) to calculate the calculation of the rock broken block is feasible; The statistical results of the lumpiness distribution achieved by SPH particle flow algorithm are basically consistent with the traditional model experiment, and have higher accuracy; The suitable single consumption is calculated according to the block requirement. The evenness index n fluctuates within a certain range and decreases overall; 0.39 ~ 0.55 kg·m-3, 0.63 ~ 0.71 kg·m-3 segment is rising, 0.55 kg·m-3 is the largest, Well-broken rock, the average block is small, and the largest size in the middle connection section decreases, showing abnormal fluctuations, showing abnormal fluctuations Decrease, this change law also applies to the rapid change of the maximum mass.

     

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