岩体结构面对爆炸冲击工程响应的影响

来源期刊:中南大学学报(自然科学版)2017年第6期

论文作者:胡建华 高宏伟 薛小蒙 周科平

文章页码:1560 - 1568

关键词:结构面;爆炸冲击;质点峰值振速;影响度

Key words:structural planes; explosion shock; peak particle vibration velocities; influencing degree

摘    要:基于裂隙岩体的结构面是矿山安全生产的重要影响因素,对爆炸冲击应力波的传播规律有重要影响,以铜坑矿岩体力学参数为基础,采用ANSYS /LS-DYNA软件,建立结构面厚度、倾角及结构面充填材料对爆炸冲击工程响应的数值模型,获取结构面对爆炸冲击下的工程响应特性,并基于神经网络构建结构面参数灰关联神经网络预测模型,确定结构面参数在爆破冲击工程响应的重要度。研究结果表明:结构面前、后测点的质点峰值振速的衰减度与结构面厚度呈指数函数,当结构面厚度为0,5,10,15和20 cm时,衰减度分别为0.365,1.508,2.303,2.418和2.443;结构面倾角对爆破冲击工程响应与衰减度呈正相关,当结构面倾角为30°,45°和60°时,衰减度分别为1.580,2.495和2.698;当结构面的充填材料为胶结、碎屑、泥质时,质点峰值振速的衰减度分别为2.303,2.458和2.598,与充填材料的强度呈负相关;3种因素的影响度由大到小依次为结构面厚度、倾角、充填材料强度。

Abstract: Considering that structural plane of fractured rock mass is one of the important factors that affects mine safety production, and it has important effect on the propagation law of explosion shock waves, blasting engineering response numerical models with different structural planes’ thicknesses, angles and structural planes’ filling material conditions were established based on rock mass mechanics parameters and ANSYS/LS-DYNA software, structural plane engineering’s response characteristics were obtained. Then neural network forecasting model based on grey relational analysis with different structural plane parameters was built by neural network to study the response degree of structural plane parameters in blasting engineering. The results show that attenuation degree before and after the structure’s peak particle vibration velocities presents exponential function with structural plane’s thickness. When the thickness is 0, 5, 10, 15 and 20 cm, attenuation degree is 0.365, 1.508, 2.303, 2.418 and 2.443, respectively. Attenuation degree is also positively correlated with structural plane’s angle, when the angle is 30°, 45° and 60°, the attenuation degree is 1.580, 2.495 and 2.698, respectively. When structural plane’s filling material is consolidated, debris, argillaceous and attenuation degree is 2.303, 2.458 and 2.598, respectively, and it is negatively related to intensity of filling material. The influencing degree of three factors from big to small is structural plane’s thickness, angle and intensity of filling material.

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