基于波速场反演的爆破损伤区范围界定研究

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中文摘要：岩体爆破损伤区范围的量化界定对于爆破作用下地下工程围岩稳定性评价、基岩开挖损伤控制等具有重要意义.基于多模板快速行进法(multistencils fast marching methods,MSFM)与同步迭代重建技术(simultaneous iterative reconstructive technique,SIRT),提出一种基于波速场反演定量确定岩体爆破损伤区范围的方法.通过对比反演所得波速场与己知波速场模型,验证所提方法的有效性.使用自主研发的OpenFDEM有限-离散元求解器进行爆破、波速测量模拟,采用自编程后处理程序处理波形数据,对爆破后模型的波速场进行重建.结合现行规范中岩体损伤表征的波速变化率判据,对比分析波速场中不同波速变化率区域与爆生裂纹区域.使用爆破损伤程度不同的区域等效半径与爆破孔半径之比,量化爆破损伤的范围.分别以波速变化率10％与15％作为岩体爆破轻微损伤以及完全损伤的阈值,爆破轻微损伤区及爆破损伤区等效半径与爆破孔半径之比分别为11.86与7.2左右.随着爆破荷载的增加,不同程度损伤区的形状逐渐变得不规则,等效半径增大.研究结果可为现场爆破损伤区范围的确定提供参考.

外文标题：Study on the quantitative definition of blasting damage zone scope based on wave velocity field inversion

外文摘要：Determining the scope of the rock mass blasting damage zone is important for evaluating the stability of underground engineering surrounding rock under blasting and controlling bedrock damage under excavation.A method based on wave velocity field inversion was proposed to determine the rock blasting damage zone scope quantitatively.This method was based on multistencils fast marching methods(MSFM)and simultaneous iterative reconstructive technique(SIRT).The effectiveness of the proposed method was verified by comparing the inversed wave velocity field with the known one.Blasting and wave velocity measurement simulations were carried out on the self-developed finite-discrete element solver OpenFDEM.The waveform data were processed using a self-programmed post-processing program,and thus the post-blasting wave velocity field was reconstructed.Based on the relationship between the changing rate of wave velocity and the degree of rock mass damage in the current code,the areas with different wave velocity changing rates were compared with the areas of cracks.The scopes of the blasting damage zone with different damage degrees were quantified using the ratio of the equivalent radius to the blast hole radius.10％and 15％of the wave velocity changing rate were used as the thresholds for defining slightly and completely damage of the rock mass,respectively.The ratio of the equivalent radius of the slightly damage zone and the damage zone to the radius of the blast hole is about 11.86 and 7.2,respectively.As the blast load increases,the shape of the damage zones with different damage degree becomes irregular and the equivalent radius increases.The study results are expected to provide a reference for determining the scope of the blasting damage zone in the field.

外文关键词：

rock mechanicsblasting damage zonewave velocity field inversionmultistencils fast marching methodssimultaneous iterative reconstructive techniquefinite-discrete element simulation

作者：

傅帅旸、李海波、吴迪、王犇、刘黎旺、李晓锋

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作者单位：

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071

中国科学院大学,北京 100049

南京理工大学机械工程学院,江苏南京 210094

关键词：

岩石力学爆破损伤区波速场反演多模板快速行进法同步迭代重建技术有限-离散元模拟

基金：

国家自然科学基金资助项目国家重点研发计划资助项目

项目编号：

U22A202392020YFA0711802

出版年：

2024

DOI：

10.13722/j.cnki.jrme.2023.0932

岩石力学与工程学报

中国岩石力学与工程学会

岩石力学与工程学报

CSTPCD北大核心

影响因子：2.589

ISSN：1000-6915

年,卷(期)：2024.43(z1)