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Gold Science and Technology >

2022 , Vol. 30 >Issue 3: 414 - 426

DOI: https://doi.org/10.11872/j.issn.1005-2518.2022.03.130

Mining Technology and Mine Management

Numerical Simulation of Homogeneous Rock Mass Damage Caused by Two-hole Simultaneous Blasting Based on RHT Model

  • Weihua WANG ,
  • Yang LIU ,
  • Liwei ZHANG ,
  • Henggen ZHANG
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  • School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China

Received date: 2021-09-17

  Revised date: 2022-03-10

  Online published: 2022-09-14

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Highlights

Due to the complex nature of rock mass and the different transfer modes of explosive energy，it is difficult to control the blasting process and blasting effect.After blasting，the damage of rock mass around blast holes is related to the bearing capacity and stability of the project.In order to explore the influence of blast hole spacing and additional free surface on the blasting process and effect during double-hole blasting，a double-hole blasting model was established based on RHT （Riedel Hiermaier Thoma） damage constitutive model by using LS-DYNA finite element software to simulate rock blasting damage under different working conditions.The experiment of previous scholars was repeated by numerical simulation，and the test results were compared with the numerical simulation results in this paper to verify the feasibility of the numerical simulation method and the rationality of the selection of material parameters.Through the comparative analysis between numerical simulation results and blasting experimental results，it is determined that the rock blasting damage threshold applicable to this paper is 0.5 based on the blasting mechanism，and the rock damage value greater than 0.5，which is called the effective damage of rock.The effective damage rate of rock is defined as the proportion of the effective damage range of rock in the plane damage cloud map to the total plane area.The change of effective damage rate of rock is used to intuitively show the temporal and spatial evolution law of rock damage in the blasting process.The rock damage nephograms at different times were intercepted to observe the damage in different directions of the rock after blasting.The damage nephograms were processed by LS-PrePost to obtain the distribution range of effective damage on the plane.Then，the MATLAB program was used to calculate the effective damage rate，and the numerical calculation and analysis were carried out.The results show that the effective damage rate of rock decreases with the increase of blast hole spacing，and the effective damage rate at the same section is the largest in the scheme with the smallest blast hole spacing.The superposition effect of blasting energy between adjacent blastholes decreases with the increase of blast hole spacing，and a more ideal blasting effect can be obtained with an appropriate blast hole spacing.The effective damage rate of rock decreases gradually with the increase of the distance between the free surface and the center of the blast hole，and the blasting energy tends to propagate to the free surface.The influence of additional free surface on the distribution of blasting energy decreases with the increase of the distance between the free surface and the blast hole.

Cite this article

Weihua WANG , Yang LIU , Liwei ZHANG , Henggen ZHANG . Numerical Simulation of Homogeneous Rock Mass Damage Caused by Two-hole Simultaneous Blasting Based on RHT Model[J]. Gold Science and Technology, 2022 , 30(3) : 414 -426 . DOI: 10.11872/j.issn.1005-2518.2022.03.130

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国内首个基于WiFi6Mesh组网井下远程控制铲运机在焦家金矿成功试运行

2022年8月，山东黄金所属焦家金矿圆满完成基于WiFi6Mesh组网环境下的铲运机远程控制试验并成功试运行。据悉，这是国内首个基于WiFi6Mesh组网环境下，完成的井下大型铲运设备远程控制应用。

为加速推进“三化”建设，焦家金矿围绕智能装备应用井下作业充分调研了采场的作业环境和设备运行过程，将井下机械化采掘作业实操基地作为本次试验地点，联合华为、中国移动、莱州拓兴等单位，开展基于WiFi6Mesh组网环境下，无轨设备远程操控试验。

期间克服了井下矿脉资源窄，矿房较小且分散、转场频繁、开采过程和持续伴随爆破作业等原因，造成的网络和基站安装维护工作难度大，过程成本高等难题。

部署华为WiFi6基站、天线、AC控制器和交换机等设备，调试搭建无线Mesh组网环境并对原有远程操控的3立方铲运机，进行通信设备、车载控制程序和远程操控台程序升级改造，在顺利完成各种场景测试后圆满完成了在焦家金矿寺庄分矿地表调度中心的远程控制。

据了解，WiFi6除了具备5G的高速率低延时特性之外，还可以进行Mesh无线桥接组网，简化了矿房转场过程中，无线基站的安装和维护工作，提高了工作效率，同时还降低了过程成本，在WiFi6产品上，增加的双发选收的新技术，解决了无线漫游丢包的问题，保障了设备运行的安全。

下一步，山东黄金将持续研究推进“5G+智能采矿”“5G+智能辅助运输”等技术项目，打造“机械化换人、自动化减人、信息化管人、智能化无人”矿山生产运营新模式，进一步提升开采效率与安全生产水平。

山东黄金集团有限公司

http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-3-414.shtml

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