| 室内小药量岩石爆破损伤评价方法及装置 |
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| 作者姓名： | 王雁冰 于冰冰 孔骥 王兆阳 吴后为 |
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| 作者单位： | 1中国矿业大学(北京)力学与建筑工程学院,北京100083;2深部岩土力学与地下工程国家重点实验室,北京100083 |
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| 摘 要： | 爆破损伤的定量评价一直是工程爆破界非常关注的问题。本研究自主设计研发了一种主动围压与边界约束装置，解决了传统的室内小试件爆破时的边界约束和炮孔封堵效果不佳带来的冲孔问题。基于CT扫描和三维重构，提出了爆破后岩石损伤度的测试及计算方法来定量评价和分析室内小药量爆破岩石试件后的损伤破裂程度。利用该装置和方法开展不同相对围压条件下小药量室内红砂岩的爆破试验，进行爆后试件的CT扫描和CT图片的二值化处理，基于Mimics1001重构了岩石试件，发现重构的模型和真实的爆后试件具有很强的相似性。最后计算了分形维数和损伤度，发现分形维数和损伤度随围压的增大而呈现减小的趋势。本研究可为爆破损伤评价提供一种新思路。
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| 关 键 词： | 爆破损伤 损伤度 CT扫描 三维重构 |
Methods and devices for evaluation of blasting damage to indoor small quantity rock |
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| Affiliation: | 1School of Mechanics and Civil Engineering,China University of Mining & Technology Beijing ,Beijing 100083,China;2State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China |
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| Abstract: | Quantitative evaluation of blasting damage has always been a matter of great concern to the engineering blasting fieldIn this paper，an active confining pressure and boundary constraint device is designed and developed to solve the problem of boundary constraint in traditional indoor small specimen blasting and punching problem caused by poor sealing effectBased on CT scan and 3D reconstruction，the method of testing and calculating the rock damage after blasting is proposedThe method can be used to quantitatively evaluate and analyze the degree of damage and fracture after the rock specimen is blasted with small chargeUsing the device and the method，the laboratory blasting test of red sand stone of small charge under different relative confining pressure was carried out，the CT scan and CT image binarization processing of the post explosion specimen was carried out，and the rock specimen was reconstructed based on Mimics 1001It is found that the reconstructed model has strong similarity with the real post explosion specimenFinally，fractal dimension and damage degree are calculatedThe research results provide a new idea for blasting damage evaluation. |
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