岩体结构面对爆炸冲击工程响应的影响

发布时间：2019-04-03 18:15

【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]:The structural plane of fractured rock mass is an important factor affecting the safety of mine production and has an important influence on the propagation law of explosive shock stress wave. Based on the mechanical parameters of Tongkeng mine rock mass, the thickness of structural plane is established by using ANSYS/LS-DYNA software. The numerical model of inclination angle and structural surface filling material's response to explosion shock engineering is obtained, and the engineering response characteristics of structure under explosion impact are obtained, and the grey correlation neural network prediction model of structural surface parameters is constructed based on neural network. The importance of structural plane parameters in blasting impact engineering response is determined. The results show that in front of the structure, the attenuation of the peak vibration velocity of the measured point is exponential with the thickness of the structure plane. When the thickness of the structure plane is 0, 5, 10, 15 and 20 cm, the attenuation is 0.365, 1.508,2.303,2.418 and 2.443, respectively. There is a positive correlation between the structural plane dip angle and the attenuation degree. When the structural plane inclination angle is 30 掳, 45 掳and 60 掳, the attenuation degree is 1.580, 2.495 and 2.698, respectively. When the filling material of structural surface is cementation, clastic and muddy, the attenuation of peak vibration velocity of particle is 2.303, 2.458 and 2.598 respectively, which is negatively correlated with the strength of filling material. The influence degree of the three factors from large to small is the thickness of the structure plane, the inclination angle and the strength of the filling material.
【作者单位】：中南大学资源与安全工程学院湖南省深部金属矿开发与灾害控制重点实验室;中钢集团马鞍山矿山研究院有限公司;
【基金】：国家“十二五”科技支撑计划项目(2015BAB12B01,2013BAB02B05) 国家自然科学基金资助项目(41672298)~~
【分类号】：TD315

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